Best Longevity Supplements Guide

Longevity supplements have moved from a fringe biohacking curiosity to a mainstream category — but the gap between the marketing and the actual human evidence remains enormous. This guide cuts through it. Rather than another list of 20 bottles promising to "reverse ageing", it grades each compound by the strength of its human clinical data, shows you how to build a sensible stack for your age and goals, and explains how to buy safely in the UK without overpaying. It is written for adults who want the honest picture: what genuinely has trial support, what is promising but unproven, and what is little more than a hopeful mechanism in a mouse.

Two resources are worth bookmarking before you go further, because almost every longevity stack is built on them: our pillar explainer on NMN benefits, side effects and dosage, and the full NMN supplements collection. If you only take one product away from this guide, the most-studied dose format sits in NMN Pro 1000.

Quick start: the 60-second version

If you're overwhelmed by the choice, start here. The table below is the shortest defensible answer to "what should I actually take?", organised by decade. Every recommendation sits in Tier 1 or high Tier 2 of the evidence grading we set out below — nothing speculative, nothing exotic.

Three rules that matter more than the table: get sleep, movement and blood pressure right first; add one compound at a time and give it 8–12 weeks; and buy only third-party-tested products with a Certificate of Analysis. If you follow nothing else in this guide, follow those.

New to this entirely? Jump to the beginner roadmap, which sequences everything in order. Want the full ranking instead? Go to the top 20. And read who should not take longevity supplements before you buy anything — it's short and it matters.

Do longevity supplements actually work?

The honest answer is: some do something, most are unproven, and none is a substitute for the basics. This is the most important sentence in the entire guide, and it is the opposite of what most supplement pages will tell you.

The single most robust finding in the whole longevity literature is not about a capsule at all. Sleep, regular movement, blood-pressure control, not smoking, and a Mediterranean-style diet still outperform every supplement ever tested for healthy lifespan. A longevity stack is a layer you add after that foundation is in place — never a replacement for it. If your sleep is broken and you are sedentary, no amount of NMN will move the needle.

Within supplements, the evidence divides sharply. A handful of compounds have genuine randomised controlled trial (RCT) data in humans showing measurable biological effects. A larger group has promising early human data or strong mechanistic rationale but no outcome trials. And a sizeable third group is marketed aggressively on the back of mouse studies alone. We separate these three tiers explicitly below, because conflating them is exactly how people end up spending £150 a month on hope.

Biomarkers versus how you feel

One of the hardest things for a new buyer to grasp is that a supplement can be "working" biochemically while you feel nothing at all — and, conversely, that feeling more energetic within days is more likely to be expectation than pharmacology. When a trial reports that NMN doubled blood NAD+, that is a real, measured change. But NAD+ is not a feeling; it is a coenzyme. The functional benefits that follow from raising it — better endurance, preserved muscle, slower biological ageing — accumulate over months and are subtle even when present. This is why the honest longevity claim is almost always about biomarkers and long-run risk rather than day-to-day wellbeing, and why any product promising you'll "feel 10 years younger in a week" is selling the placebo response rather than the compound.

The placebo effect is not trivial in this category, either. Longevity buyers are, almost by definition, health-motivated, hopeful, and paying attention to their bodies — all of which amplify perceived benefit. That is precisely why randomised, placebo-controlled trials matter so much here: they are the only way to separate what the molecule does from what wanting it to work does. Throughout this guide, when we say a compound is "Tier 1", we mean it has beaten placebo in a controlled human trial — not that users report liking it.

Healthspan, not lifespan — the goal that actually makes sense

It is worth stating the realistic aim plainly. No supplement is going to add decades to your life. What the better compounds may do is compress morbidity — shorten the frail, unwell period at the end of life — so that you spend more of your years mobile, sharp and independent. That is healthspan, and it is a goal supported by mechanism and, for a few compounds, by measurable functional endpoints like grip strength and walking distance. Framed that way, a sensible longevity stack stops looking like a bet on immortality and starts looking like what it is: risk reduction and functional preservation, bought at the margins, on top of a genuinely healthy life.

It is also worth being upfront about the compounds that have quietly failed. Several once-hyped ingredients have underwhelmed when finally tested properly in people. For a frank look at these, see our pieces on whether NMN is a scam, whether resveratrol actually works, and our roundup of longevity supplements that don't work. Reading the sceptical case first is the fastest way to become a better buyer.

The science of ageing: what you're actually trying to slow

To judge any longevity supplement, you need a rough map of what ageing is at the cellular level — because a good supplement targets a specific, measurable driver of ageing, and a poor one targets nothing in particular.

The twelve hallmarks of ageing

The most influential framework in the field was set out by López-Otín and colleagues, who in 2013 defined nine "hallmarks of ageing" and in a landmark 2023 update in the journal Cell expanded these to twelve: genomic instability, telomere attrition, epigenetic alterations, loss of proteostasis, disabled autophagy, deregulated nutrient sensing, mitochondrial dysfunction, cellular senescence, stem cell exhaustion, altered intercellular communication, chronic inflammation, and dysbiosis of the gut microbiome.¹ The crucial point is their third criterion: a true hallmark is one you can therapeutically slow, stop or reverse — which is precisely where supplements attempt to intervene.

We explain each of these in plain English in our dedicated guide to the hallmarks of ageing. For this guide, three hallmarks matter most because they are the ones supplements most credibly touch:

• Mitochondrial dysfunction. Mitochondria are the power plants inside your cells, and their capacity to generate energy declines with age. This underlies much of the fatigue, reduced exercise tolerance and slower recovery that people notice from their forties onward. Compounds like NMN (via NAD+), Urolithin A (via mitophagy) and CoQ10 (via the electron transport chain) all aim, in different ways, at this single hallmark — which is why they recur in almost every serious stack.
• Deregulated nutrient sensing. Your cells have ancient molecular sensors — pathways such as mTOR, AMPK and the sirtuins — that respond to food, fasting and exercise. Keeping these appropriately balanced is one of the most conserved longevity mechanisms across species, and it's the pathway that caloric restriction, fasting and exercise act on directly. Several supplements claim to nudge these sensors, though few have proven they do so meaningfully in humans.
• Disabled autophagy. Autophagy is your cells' recycling and quality-control system, clearing out damaged proteins and organelles. It slows with age, allowing cellular "junk" to accumulate. Fasting is the most reliable way to switch it on; spermidine and Urolithin A are the supplements most credibly linked to it.

If a supplement can't tell you which hallmark it targets and by what mechanism, treat that as a red flag. The reverse is a useful buying filter: the compounds worth your attention can all name their target.

Biological age versus chronological age

Your chronological age is fixed; your biological age — an estimate of how worn your cells actually are — is not. This is the metric the longevity field genuinely cares about, and it is increasingly measurable through epigenetic "clocks" and blood-based panels. Understanding it reframes the whole exercise: the goal is not to add decades to your lifespan on the back of a capsule, but to compress the period of ill-health at the end of life — to increase healthspan. Our explainers on biological age and how to lower your biological age go into detail.

How to read a supplement study yourself

The single most valuable skill in this category is the ability to look past a headline and judge the evidence behind it. Four questions will protect you from most of the marketing:

• Was it in humans? An enormous share of longevity claims rest entirely on studies in mice, worms or cell cultures. These are how research begins, not how it ends. A finding in a petri dish tells you a compound is worth studying — nothing more.
• Was it randomised and placebo-controlled? Without a control group taking a dummy pill, you cannot tell the compound's effect from the placebo response, regression to the mean, or the natural course of things. "Users reported improvements" is not evidence.
• What was actually measured? A trial can be technically positive while measuring something trivial. Raising a biomarker is not the same as improving a health outcome. Look for functional endpoints — strength, walking distance, cardiovascular events — not just a molecule going up in a blood test.
• Who funded it, and how big was it? A 20-person, manufacturer-funded study is a starting signal, not a verdict. Independent replication in larger samples is what turns a promising compound into a proven one.

Apply those four questions to any longevity product you're considering and you will immediately be a more discerning buyer than most of the market. They are also exactly the lens we use to assign the evidence tiers below.

The levers that beat every supplement

Two non-supplement interventions deserve special mention because they have stronger longevity evidence than almost any pill. The first is autophagy, the cellular clean-up process switched on by fasting and by certain compounds. The second is Zone 2 cardio — low-intensity aerobic training that directly improves mitochondrial density and function. The populations with the world's longest healthy lifespans, the so-called Blue Zones, achieve their results through diet, daily movement and social connection — not supplementation. Any honest longevity guide has to put these first.

The compounds, ranked by evidence tier

Here is the heart of the guide: every major longevity compound sorted by how strong its human evidence actually is. This is deliberately more conservative than most supplement rankings, because grading by hype rather than data is how the category earned its poor reputation.

Tier 1 — the compounds with real human trial data

NMN and NAD+ precursors. NAD+ is a coenzyme central to energy metabolism and DNA repair, and its levels fall with age. NMN (nicotinamide mononucleotide) is the most-studied precursor for raising it. Human RCTs have now shown that oral NMN reliably increases blood NAD+ and is well tolerated: a 2022 dose-ranging trial in 80 healthy middle-aged adults found that 300–900 mg daily for 60 days raised NAD+ dose-dependently and improved six-minute walking distance,² and separate safety trials confirmed tolerability at doses up to 1,250 mg per day.³ The honest caveat: a 2024 systematic review concluded that evidence for NMN improving age-related metabolic outcomes remains equivocal.⁴ It raises NAD+; whether that translates into a longer healthspan in humans is still being established. NMN is covered in depth in our NMN pillar guide and NAD+ supplement guide.

Urolithin A. This gut-derived metabolite activates mitophagy — the recycling of damaged mitochondria. It has arguably the cleanest recent trial record of any novel longevity compound. A 2019 first-in-human study in Nature Metabolism established safety and a favourable mitochondrial gene-expression signature,⁵ and a 2022 randomised trial in Cell Reports Medicine found roughly a 12% improvement in muscle strength over four months in middle-aged adults.⁶ See our guides to Urolithin A in the UK and the Mitopure review.

Creatine. Long dismissed as merely a gym supplement, creatine is quietly one of the best-evidenced compounds in any longevity stack. It has one of the deepest safety records of any supplement, decades of research behind it, and — crucially for ageing — growing evidence for muscle-preservation and cognitive benefits in older adults. Because sarcopenia (age-related muscle loss) and cognitive decline are two of the defining features of unhealthy ageing, a cheap, safe compound that plausibly addresses both is exactly the kind of unglamorous win this category needs more of. It is also one of the highest evidence-per-pound choices available. Our piece on creatine for longevity makes the full case.

CoQ10. Coenzyme Q10 supports mitochondrial energy production and declines with age. Its standout evidence is the Swedish KiSel-10 trial, in which four years of CoQ10 combined with selenium in elderly people with low selenium status significantly reduced cardiovascular mortality — an effect still detectable twelve years later.⁷ Note the two caveats: the benefit was seen with selenium and in a selenium-deficient population. See CoQ10 vs ubiquinol.

Omega-3 and Vitamin D3. The unglamorous foundations, and the ones most people should sort out before spending a penny on anything exotic. Both have extensive trial literature and both address genuine, common shortfalls: oily-fish intake is low across much of the UK population, and vitamin D deficiency is widespread through the British winter — the NHS itself advises considering a vitamin D supplement in the darker months. Omega-3s support cardiovascular and cognitive health; adequate vitamin D underpins bone, muscle and immune function. Neither will appear on a biohacker's "cutting-edge stack" graphic, precisely because neither can be sold at a premium — which tells you a great deal about how the marketing in this category is weighted. If your longevity budget is limited, correcting these two shortfalls is a better first move than any Tier 2 or Tier 3 compound.

Tier 2 — promising, but not yet proven in people

Taurine is the most interesting recent entry. A major 2023 study in Science found that taurine declines with age across species and that restoring it extended healthspan in mice and monkeys and lifespan in mice and worms.⁸ That generated enormous excitement — but a 2025 analysis in Aging Cell pushed back, arguing the human data do not clearly support taurine deficiency as a driver of ageing in people.⁹ This is Tier 2 precisely because the human question is genuinely open. Our taurine and longevity guide covers both sides.

Also in this tier: spermidine (an autophagy inducer with encouraging observational data), fisetin (a senolytic under human study), GlyNAC (glycine plus NAC, with promising small trials on glutathione and mitochondrial function), NAC on its own, TMG (a methyl donor often paired with NMN), ergothioneine, astaxanthin, and magnesium — where the threonate versus glycinate distinction matters for how you use it.

Tier 3 — mostly mechanism and mice

Resveratrol is the cautionary tale of the category: spectacular in vitro and in yeast, underwhelming in human outcome trials, with poor bioavailability. Pterostilbene is often promoted as a more bioavailable cousin, but human longevity data are similarly thin. Also here: calcium AKG, modified citrus pectin, C15:0, shilajit, lion's mane, TUDCA, butyrate and Akkermansia. Several are genuinely interesting and may graduate to Tier 2 as trials report — but paying premium prices for Tier 3 compounds today is speculation, not optimisation.

Prescription-only: rapamycin and metformin

Two of the most-discussed molecules in longevity science are not supplements at all. Rapamycin and metformin are prescription medicines under active study (the TAME trial for metformin being the best-known). They require medical supervision and are outside the scope of any self-directed stack. We cover them for completeness, not as a buying recommendation.

The evidence scorecard

Tiers tell you how strong the evidence is, but they don't tell you whether a compound is worth your money. This scorecard adds the two dimensions that actually drive a buying decision: safety and cost. A compound with moderate evidence, excellent safety and a low price may be a far better buy than one with slightly better data at five times the cost.

*Shilajit safety depends heavily on sourcing — unpurified products have been associated with heavy metal contamination, making third-party testing non-negotiable. See our shilajit guide.

How to read this: "Overall" weighs evidence strength against safety and cost together. That's why creatine and vitamin D3 score five stars despite being unglamorous — they're well-proven, extremely safe and cheap. Urolithin A has genuinely good trial data but loses a star on cost. Resveratrol scores poorly not because it's dangerous, but because the human evidence has repeatedly disappointed.

Best longevity supplements ranked: the top 20

This is our overall ranking, weighing human trial evidence first, then safety, then value. It will look different from most "best longevity supplements" lists, and that's deliberate: the compounds with the strongest evidence are often the cheapest and least exciting, while several of the most heavily marketed sit low down.

Best longevity supplements by goal

Most people don't want "longevity" in the abstract — they want more energy, a sharper mind, or to still be carrying their own shopping at 80. Here's what the evidence supports for each specific goal.

Best for energy

NMN, CoQ10, Creatine. Fatigue that comes with age is substantially mitochondrial. NMN raises NAD+, the coenzyme central to energy metabolism; CoQ10 supports the electron transport chain directly; creatine buffers rapid energy demand. Start with the NMN guide and compare PQQ vs CoQ10. Realistic expectation: subtle improvement over weeks, not a stimulant hit.

Best for brain health

Omega-3, Creatine, Magnesium L-threonate, Lion's Mane. Omega-3 has the deepest evidence for cognitive ageing; creatine shows promising cognitive effects particularly under sleep deprivation or stress; magnesium L-threonate is the form that best crosses into the brain — see threonate vs glycinate. Lion's mane is popular but its human data remain early.

Best for healthy ageing overall

NMN, Vitamin D3, Omega-3, Creatine. This is the core "do the basics excellently" stack — the four compounds with the best evidence-to-cost ratio across the widest range of ageing hallmarks. See the complete longevity stack and the minimal stack.

Best for muscle preservation

Creatine, Protein, Urolithin A, Vitamin D3. Sarcopenia is arguably the single biggest threat to independence in later life. Creatine and adequate protein are the foundation; Urolithin A has randomised trial data showing roughly a 12% improvement in muscle strength. Resistance training remains non-negotiable — no supplement substitutes for it. See supplements for men over 50.

Best for heart health

Omega-3, CoQ10, Magnesium, Berberine. CoQ10's KiSel-10 trial data on cardiovascular mortality is among the strongest longevity-adjacent findings anywhere. Berberine may help metabolic markers. Blood pressure control and not smoking still outrank all of these — see what to measure.

Best for gut health

Akkermansia, Butyrate, Glutamine, Fibre. Dysbiosis is one of the twelve hallmarks of ageing. See Akkermansia, butyrate supplements, sodium butyrate vs tributyrin and glutamine vs collagen for gut health. Dietary fibre diversity beats any capsule here.

Best for skin ageing

Collagen, Astaxanthin, Vitamin C, Omega-3. Collagen peptides have reasonable trial evidence for skin elasticity and hydration; astaxanthin is a potent antioxidant with photoprotective data. Compare in astaxanthin vs collagen and read supplements for skin ageing. Sun protection outperforms every supplement on this list.

Best for sleep

Magnesium glycinate, Apigenin, Glycine. Sleep quality is arguably the highest-leverage longevity variable there is, which makes this category unusually worth getting right. See apigenin vs magnesium for sleep. If you work nights, read shift work supplements.

Best for inflammation

Omega-3, Urolithin A, Astaxanthin, Fisetin. Chronic inflammation — "inflammaging" — is one of the twelve hallmarks. Omega-3 has the strongest data; Urolithin A significantly lowered C-reactive protein in its randomised trial. Fisetin targets senescent cells, a major inflammatory source.

Best for women in midlife

Vitamin D3, Magnesium, Collagen, Omega-3, NMN. Bone density and muscle mass changes around menopause make vitamin D and protein especially important. See supplements for women over 40 and NMN and menopause.

Best for athletes

Creatine, NMN, Urolithin A, CoQ10. NMN improved aerobic capacity in trained runners in a randomised trial, and Urolithin A improved endurance markers. See supplements for endurance athletes and NMN vs creatine.

NAD+ and NMN: the foundation of most longevity stacks

Because NAD+ decline touches so many hallmarks of ageing at once, NAD+ precursors are the backbone of the majority of longevity stacks — which is why we treat NMN in its own dedicated section and maintain a full NMN supplements collection. For the complete science, dosing and side-effect profile, the definitive resource is our NMN benefits, side effects and dosage pillar.

The practical questions people ask most often each have a dedicated answer: whether you need TMG alongside NMN (the methylation question), NMN dosage by age, and how long supplements take to work. If you are choosing between formats, compare sublingual NMN and liposomal NMN for bioavailability.

Choosing between similar compounds

A large part of the confusion in this category comes from near-identical compounds competing for the same slot in your stack. Here is a quick decision matrix linking to our detailed head-to-heads.

How to take longevity supplements

Timing, food and dosing all affect whether a supplement works — and getting them wrong is a common reason people conclude a compound "did nothing". If you are completely new to this, start with our guide on how to start longevity supplements, then use the specifics below.

Timing and food

• When to take NMN: most protocols favour the morning — see when to take NMN.
• With or without food: this varies by compound; see NMN with food and the general rules on taking supplements on an empty stomach.
• Combining compounds: some interact or compete for absorption — read whether you can take supplements together and use our supplement timing chart.

Dose, cycling and stopping

• Dose by age: requirements shift over the decades — see NMN dosage by age.
• Cycling: whether to take breaks is covered in cycling NMN.
• Overdosing: the safety ceiling and what happens above it — NMN overdose.
• Stopping: what to expect if you come off — stopping NMN.

What to expect: the longevity timeline

"How long does NMN take to work?" is one of the most-searched questions in this category, and the honest answer is that different things change on very different schedules. Biomarkers move first, then function, then — potentially — long-term risk. Here's a realistic timeline.

The practical takeaway: give any compound at least 8–12 weeks before deciding, and re-test your markers at six months rather than chasing daily sensations. For compound-specific detail, see how long supplements take to work.

The beginner roadmap

If you're starting from zero, the order matters enormously. Most people begin at step seven and wonder why nothing happened. Work through these in sequence — and don't move on until the previous step is genuinely in place.

Building a stack for your age, sex and goals

There is no universal stack. The right combination depends on your decade, your physiology and what you are optimising for. Below are our tailored guides — start with the one that fits you.

By decade and life stage

• Longevity supplements in your 30s — prevention-focused, minimal.
• Longevity supplements for women over 40, including NMN and menopause.
• Longevity supplements for men over 50.

By goal and lifestyle

• Endurance athletes — where NMN, CoQ10 and Urolithin A fit.
• Skin ageing — the collagen and astaxanthin question.
• Shift workers — managing circadian disruption.
• Vegan longevity supplements — closing the common dietary gaps.

By budget

• The minimal stack — the smallest effective set.
• A cheap longevity stack — maximum evidence per pound.
• The complete longevity stack and the popular NMN + TMG + resveratrol stack.

What to measure: tracking whether it's actually working

If you're spending several hundred pounds a year on supplements, you should know whether they're doing anything. This is the section most longevity guides skip entirely — and it's the one that separates an evidence-based approach from an expensive act of faith. Establish a baseline before you start, then re-test at six and twelve months.

Functional markers you can test at home

Blood markers worth requesting

Biological age tests. Epigenetic clocks and blood-panel-derived age estimates are the headline metric of the longevity field. They're genuinely interesting, but treat single results with caution — test-retest variability can be significant, so trends over years matter more than any one number. See biological age and how to lower your biological age.

Discuss any blood testing with your GP, who can advise which markers are appropriate for you and interpret the results in the context of your full medical history.

Seven common mistakes

Almost every disappointing longevity supplement experience traces back to one of these.

1. Buying underdosed products

A product can contain the right ingredient at a fraction of the studied dose — technically honest labelling, practically useless. Always compare the per-serving dose against the dose used in the trials. Many "longevity blends" contain twelve ingredients at doses too low for any of them to work.

2. Buying without a Certificate of Analysis

No COA means no independent proof of what's in the bottle or what contaminants aren't. This matters most for compounds like shilajit where contamination is a documented risk. See how to read a COA.

3. Starting five supplements at once

If you start everything simultaneously and feel better, you've learned nothing about which compound did it — and you'll keep paying for four things that may be doing nothing. Introduce one at a time.

4. Expecting results in a week

As the timeline above shows, eight to twelve weeks is the minimum fair trial. Abandoning at day ten is the single most common way people waste money in this category.

5. Ignoring sleep and exercise

This is the big one. Supplements are a marginal gain layered on a good foundation. Without adequate sleep and regular movement, you're optimising the last 5% while neglecting the first 80%.

6. Paying for marketing instead of quality

Premium pricing frequently reflects brand positioning, packaging and influencer budgets rather than superior formulation. Judge on dose, testing and documentation. See why supplements are expensive and what a stack should cost.

7. Never re-testing

Buying supplements indefinitely without ever measuring anything means you have no idea whether your money is achieving something. Baseline, then re-test — see what to measure.

Longevity myths, debunked

Myth: NMN reverses ageing

False. NMN raises NAD+ levels — a real, measurable effect demonstrated in randomised trials. But raising a coenzyme is not reversing ageing, and no human trial has shown NMN extends lifespan. The credible claim is support for cellular energy metabolism and possibly healthspan markers. Anything stronger is marketing.

Myth: supplements can replace exercise

False, and the most costly belief in this category. No compound reproduces the effects of resistance training or Zone 2 cardio on mitochondrial density, muscle mass, insulin sensitivity and cardiovascular function. Supplements complement exercise; they never substitute for it.

Myth: more is better

False. Most compounds have a dose-response curve that plateaus, and some carry risks at high intakes. Higher doses of fat-soluble vitamins in particular can be harmful. Stick to studied doses — see the NMN safety ceiling.

Myth: everyone needs the same stack

False. Requirements differ by age, sex, diet, existing deficiencies, medication and goals. A vegan in their thirties and a post-menopausal woman in her fifties have genuinely different priorities — compare vegan stacks with women over 40.

Myth: expensive means better

False. Three of the five highest-rated compounds in our scorecard — creatine, vitamin D3 and omega-3 — are among the cheapest available. Price correlates with marketing spend far more reliably than with quality.

Myth: "natural" means safe

False. Plenty of natural compounds interact with medications or carry real risks. Botanical extracts in particular can affect drug metabolism. Natural origin says nothing about safety — see the section immediately below.

Who should not take longevity supplements

Pregnancy and breastfeeding

Almost no longevity compound has been tested for safety in pregnancy or breastfeeding, and absence of evidence is not evidence of safety. NMN, urolithin A, spermidine, fisetin, berberine and most botanical extracts should be avoided. Pregnancy supplementation should follow NHS guidance and your midwife's advice — which does include specific recommendations such as folic acid and vitamin D.

Cancer treatment

This is a genuinely important one. High-dose antioxidants can theoretically interfere with chemotherapy and radiotherapy, both of which work partly through oxidative mechanisms. Some compounds also affect cell growth pathways. Never add supplements during cancer treatment without explicit approval from your oncology team.

Anticoagulants and antiplatelet medication

If you take warfarin, a DOAC, clopidogrel or similar, several supplements can increase bleeding risk — high-dose omega-3, vitamin E, garlic, ginkgo and others. Vitamin K content also affects warfarin control directly. This combination requires pharmacist or GP oversight.

Diabetes medication

Berberine is the key concern: it can lower blood glucose meaningfully, and combined with metformin, sulfonylureas or insulin may cause hypoglycaemia. See berberine vs metformin. If you take glucose-lowering medication, any supplement affecting blood sugar needs medical supervision and monitoring.

Liver disease

The liver metabolises most supplements. Impaired function alters clearance and raises the risk of accumulation. Several botanical extracts, including some green tea and turmeric preparations, have been associated with liver injury in susceptible individuals. Seek specialist advice first.

Kidney disease

Reduced kidney function affects the clearance of many compounds, and some — including creatine, magnesium and potassium-containing products — need particular caution or dose adjustment in chronic kidney disease. Always discuss with your renal team.

Other situations warranting caution

• Before surgery — many supplements affect bleeding or interact with anaesthesia; most surgeons advise stopping 1–2 weeks beforehand.
• Children and adolescents — longevity compounds are neither studied nor appropriate in under-18s.
• Autoimmune conditions or immunosuppressant medication — immune-modulating supplements may interfere.
• Multiple prescription medications — interaction risk rises with each one; ask your pharmacist to run a check.

Your community pharmacist is an excellent and underused resource here: they can check interactions against your full prescription list free of charge, usually without an appointment.

Buying safely in the UK: quality, testing and cost

In an unregulated-feeling category, quality assurance is where your money is either protected or wasted. The UK has an advantage here: domestic manufacturers operate under stricter oversight than the lighter-touch US framework, which makes UK sourcing a genuine quality signal — provided you know what to check.

The three things to verify before you buy

• Third-party testing. Independent lab verification of purity and potency. See third-party tested supplements.
• A Certificate of Analysis (COA). The document proving what's actually in the bottle. Learn to read one in our Certificate of Analysis guide.
• Clean formulation. Minimal fillers and additives — a frequent hiding place for low-quality products.

What longevity supplements should cost

Prices vary wildly, and higher isn't better. We break down realistic spend in the cost of a longevity stack in the UK and explain why supplements are so expensive. For the single most-bought compound, compare value in the cheapest NMN in the UK and cheap NMN — while watching that "cheap" doesn't mean untested.

Where to buy

If you are comparing high-street and marketplace options, we've reviewed the realities of buying NMN at Boots, NMN at Holland & Barrett, and NMN on Amazon UK, plus a general guide to buying NMN in the UK. You can also buy spermidine and TMG directly.

Where Welzo Ultra Purity fits

Welzo's own range, Welzo Ultra Purity, is built specifically around the three checks above: every batch is third-party tested with a Certificate of Analysis available, formulations are kept free of unnecessary fillers, and products are sold at UK-domestic pricing that avoids the import and customs overhead that inflates the real cost of many overseas "budget" brands. We highlight Welzo Ultra Purity first not on marketing superlatives but on those verifiable grounds — testing, documentation and clean formulation are things you can check for yourself before buying. Browse the range through the NMN collection and the broader anti-ageing & longevity collection, and start with NMN Pro 1000.

The latest longevity research: what's emerging

This field moves quickly, and several compounds have shifted position in the last few years. Here's an honest read on where the emerging science currently stands — including where it has moved against a popular compound.

Urolithin A: the clearest recent success

Urolithin A has moved from obscurity to Tier 1 faster than any compound in recent memory, on the back of a genuinely well-conducted randomised trial showing roughly a 12% improvement in muscle strength alongside reduced inflammatory markers.⁶ It's expensive, and the primary endpoint in that trial (peak power output) wasn't met — but the direction of travel is positive. See Urolithin A UK.

Taurine: the cautionary update

This is the most instructive recent story in longevity science. The 2023 Science paper generated enormous excitement by showing taurine declines with age and that restoring it extended healthspan in mice and monkeys.⁸ But a 2025 analysis in Aging Cell directly challenged the human relevance of that finding.⁹ Taurine remains cheap, safe and plausible — but anyone selling it as a proven human longevity intervention is ahead of the evidence. Read both sides in taurine and longevity.

Ergothioneine

Sometimes called a "longevity vitamin", ergothioneine is a mushroom-derived antioxidant with a dedicated cellular transporter — unusual, and suggestive of a genuine physiological role. Observational data linking higher levels to lower mortality are interesting; interventional data are still early. See ergothioneine.

C15:0 (pentadecanoic acid)

An odd-chain saturated fatty acid proposed as an essential nutrient. The hypothesis is intriguing and the safety profile appears good, but the independent human evidence base remains thin and much of the research is industry-linked. Firmly Tier 3 for now — see C15:0 UK.

Ca-AKG

Calcium alpha-ketoglutarate produced striking results in mouse healthspan studies and has attracted attention from biological-age researchers. Human data remain minimal and it's costly. Worth watching, not yet worth prioritising — see Ca-AKG UK.

GlyNAC

The combination of glycine and N-acetylcysteine to restore glutathione has produced encouraging small trials in older adults, with improvements reported across several ageing markers. Sample sizes have been small and larger replication is needed — but it's cheap and well-tolerated, which makes the risk-reward reasonable. See GlyNAC and NAC.

Specialised pro-resolving mediators (SPMs)

SPMs are omega-3-derived molecules that actively switch off inflammation rather than merely suppressing it. Given that chronic inflammation is one of the twelve hallmarks of ageing, this is a mechanistically compelling direction — but human longevity data are at a very early stage.

The prescription frontier

Rapamycin and metformin remain the two most-watched molecules in the field, with the long-anticipated TAME trial designed to test whether metformin can delay age-related disease. Neither is a supplement and neither should be self-prescribed. See rapamycin and metformin for longevity.

This section is reviewed and updated as significant new trial data are published. Last reviewed: 2026.

Brand and product reviews

Before committing to any premium longevity brand, it's worth reading an independent breakdown of the formulation, dosing and value. Our review library covers the major names:

• Nuchido TIME+ review
• Elysium Basis review
• NOVOS Core review
• LYMA supplement review
• Mitopure (Urolithin A) review
• Youth & Earth NMN review
• Longevity Box review
• Renue By Science review
• Viva NMN reviews
• Vitality Pro NMN review

Frequently asked questions

Do longevity supplements actually extend your life?

No supplement has been proven to extend human lifespan. The strongest evidence supports improvements in healthspan — measurable things like muscle strength, NAD+ levels, mitochondrial markers and cardiovascular risk factors. Lifestyle factors (sleep, exercise, diet, not smoking, blood-pressure control) remain the only interventions with robust human longevity data, and supplements work best as a layer on top of those.

What is the single best longevity supplement to start with?

For most people it's an NAD+ precursor such as NMN, because NAD+ decline touches multiple hallmarks of ageing and NMN has genuine human dose-response data. That said, omega-3 and vitamin D3 are more foundational and correct common UK dietary gaps, so many people should start there. Read our NMN guide to decide.

Is NMN safe, and what dose should I take?

Human trials have found NMN well tolerated at doses from 250 mg up to 1,250 mg daily over several weeks, with 300–900 mg being the commonly studied effective range. Start at the lower end. See NMN dosage by age and the safety ceiling, and speak to your pharmacist if you take other medication.

Do I need to take TMG with NMN?

NMN metabolism uses methyl groups, and TMG (betaine) is a methyl donor sometimes taken alongside to support methylation. Whether it's necessary depends on your diet and other supplements. Our guide on TMG with NMN explains when it helps.

What's the difference between biological age and chronological age?

Chronological age is how many years you've lived; biological age estimates how worn your cells actually are, using epigenetic clocks or blood panels. Biological age can be influenced by lifestyle and, potentially, supplements — it's the metric longevity science actually targets. See biological age.

Are expensive longevity supplements better than cheap ones?

Not necessarily. Price often reflects branding and marketing rather than quality. What matters is third-party testing, a Certificate of Analysis, correct dosing and clean formulation. A well-tested budget product can outperform a premium one. See why supplements are expensive.

Does resveratrol work?

Resveratrol is the classic example of a compound that dazzled in cell and yeast studies but underdelivered in human trials, partly due to poor bioavailability. It shows small cardiometabolic effects but no human lifespan data. Read the full picture in does resveratrol work.

When should I take my longevity supplements — morning or night?

It depends on the compound. NAD+ precursors like NMN are usually taken in the morning; magnesium and sleep-supporting compounds at night. Some compete for absorption if taken together. Use our supplement timing chart and guide on taking supplements together.

How long before longevity supplements work?

Biomarker changes (like raised NAD+) can appear within weeks, but functional changes you can feel typically take 8–12 weeks or longer. Give any single compound at least this long before judging it. See how long supplements take to work.

What are the best longevity supplements overall?

Ranked by total human evidence: creatine, omega-3 and vitamin D3 lead, because they have decades of trial data, excellent safety and low cost. Among compounds developed specifically to target ageing biology, NMN ranks first, followed by urolithin A and CoQ10. See our full top 20 ranking.

What supplements should I take for energy?

NMN, CoQ10 and creatine are the evidence-based choices, because age-related fatigue is substantially mitochondrial. Expect subtle improvement over 8–12 weeks rather than a stimulant-like effect — and rule out treatable causes of fatigue such as low iron, thyroid problems or poor sleep with your GP first.

Who should not take longevity supplements?

Anyone pregnant or breastfeeding, undergoing cancer treatment, taking anticoagulants or diabetes medication, or living with liver or kidney disease should not start these without medical advice. The same applies before surgery and to under-18s. See the full contraindications section.

How do I know if my longevity supplements are working?

Measure. Establish a baseline before starting — VO₂ max, grip strength, resting heart rate, blood pressure, and bloods including ApoB, HbA1c, vitamin D and hs-CRP — then re-test at six and twelve months. Without a baseline you're guessing. See what to measure.

Are longevity supplements a scam?

The category contains both legitimate, trial-backed compounds and heavily marketed products with little evidence. It isn't a blanket scam, but it does require scepticism. The best defence is to grade by human evidence tier, verify testing, and ignore lifespan-extension claims no supplement can support. Our pieces on whether NMN is a scam and supplements that don't work keep you honest.

References

1. López-Otín C, Blasco MA, Partridge L, Serrano M, Kroemer G. Hallmarks of aging: An expanding universe. Cell. 2023;186(2):243–278. PubMed
2. Yi L, et al. The efficacy and safety of β-nicotinamide mononucleotide (NMN) supplementation in healthy middle-aged adults: a randomized, multicenter, double-blind, placebo-controlled, parallel-group, dose-dependent clinical trial. 2022. (80 adults; 300/600/900 mg; NAD+ and six-minute walk improvements.)
3. Fukamizu Y, et al. Safety evaluation of β-nicotinamide mononucleotide oral administration in healthy adult men and women. Sci Rep. 2022;12:14442. PubMed
4. Systematic review and meta-analysis of NMN supplementation on glucose and lipid metabolism in adults. Crit Rev Food Sci Nutr. 2024. Taylor & Francis
5. Andreux PA, et al. The mitophagy activator urolithin A is safe and induces a molecular signature of improved mitochondrial and cellular health in humans. Nat Metab. 2019;1:595–603. Nature Metabolism
6. Singh A, et al. Urolithin A improves muscle strength, exercise performance, and biomarkers of mitochondrial health in a randomized trial in middle-aged adults. Cell Rep Med. 2022;3(5):100633. Cell Reports Medicine
7. Alehagen U, et al. Cardiovascular mortality and N-terminal-proBNP reduced after combined selenium and coenzyme Q10 supplementation (KiSel-10). Int J Cardiol. 2013;167(5):1860–1866; twelve-year follow-up, PLoS One. 2018;13(4):e0193120. PubMed
8. Singh P, et al. Taurine deficiency as a driver of aging. Science. 2023;380(6649):eabn9257. Science
9. Marcangeli V, et al. Experimental evidence against taurine deficiency as a driver of aging in humans. Aging Cell. 2025. doi:10.1111/acel.70191. PMC