Why Longevity Supplements Are So Expensive

The longevity supplement market runs on an asymmetry. Positive findings get press releases; null findings get filed. A mouse study becomes a product page. A large negative trial becomes nothing at all.

This article is the correction. It covers what the evidence says about the longevity supplements most likely to be wasting your money — and, importantly, distinguishes between three quite different situations that usually get lumped together: things shown not to work, things shown to cause harm, and things nobody has properly tested yet.

For what we think does earn its place, see our minimal supplement stack, cheap longevity stack and the pillar guide to NMN benefits, side effects and dosage.

How to grade a supplement claim

Five questions will sort almost anything you encounter. We use them throughout this article.

1. Is there human evidence, or only cells and mice? Rodent healthspan findings translate to humans poorly and rarely.
2. Is the dose achievable? Concentrations that work in a dish are frequently unreachable in a living body at any tolerable oral dose.
3. Who funded the trials? Where independently funded trials disagree with industry-funded ones, that pattern is informative.
4. Is the endpoint a marker or an outcome? Moving a biomarker is not the same as improving health.
5. What have well-resourced players stopped doing? When a company with every incentive to succeed abandons a compound, that tells you something.

The asymmetry that creates bad supplements

It costs very little to put an ingredient with a plausible mechanism into a capsule and sell it. It costs a great deal to run the trial that would tell you whether it works. In a market where the first is legal and the second is optional, the predictable result is a shelf full of mechanisms and a shortage of outcomes.

In the UK, food supplements are regulated as foods rather than medicines. That means they must be safe and accurately labelled, but nobody has to demonstrate that they do anything before selling them. A medicine must prove efficacy to a regulator. A supplement must only avoid making a claim that regulators have not authorised — which is why product pages are full of phrases like "supports cellular energy" rather than "improves" anything specific.

Three phrases that should slow you down

• "Studies show…" — which studies, in what species, at what dose? Mouse studies are studies.
• "Clinically proven" — proven to do what? Raising a biomarker is not the same as improving health.
• "Backed by science" — every compound on this page is backed by some science. The question is whether it is backed by human outcome data.

Category 1: Evidence of harm, not benefit

These are the only entries where the evidence is strong enough to say "do not take this for this purpose".

Beta-carotene supplements

The US Preventive Services Task Force recommends against the use of beta-carotene supplements for the prevention of cardiovascular disease or cancer — a Grade D recommendation. The Task Force concluded with moderate certainty that the harms outweigh the benefits, citing adequate evidence that beta-carotene provides no benefit in preventing cardiovascular disease or cancer, and adequate evidence that it increases the risk of lung cancer in people already at increased risk [1,2].

There is a second, quieter piece of evidence. In the Nambour randomised trial, which tested daily sunscreen and 30 mg beta-carotene against skin ageing over 4.5 years, sunscreen produced a 24% reduction in skin ageing — and beta-carotene produced no effect at all [3]. Same trial, same people, same period: the topical worked and the antioxidant did nothing.

High-dose vitamin E

The same USPSTF statement recommends against vitamin E supplementation for the prevention of cardiovascular disease or cancer, concluding with moderate certainty that there is no net benefit, and noting adequate evidence that vitamin E causes at most small harms [1,2].

The wider lesson about antioxidants

The intuitive model — oxidative damage causes ageing, therefore antioxidants prevent ageing — has been tested repeatedly and has not held up. Reactive oxygen species are also signalling molecules, and suppressing them indiscriminately can interfere with useful adaptations. A randomised trial found that 250 mg/day resveratrol blunted the cardiovascular benefits of exercise training in older men, with a proposed mechanism along exactly these lines [4].

This is worth sitting with, because the "free radicals cause ageing" story is probably the most widely believed idea in consumer health, and it has been the basis for selling antioxidant supplements for four decades. The biology turned out to be more subtle than the marketing. Your body uses controlled oxidative stress as a signal — during exercise, during immune responses, during cellular housekeeping. A supplement that blankets that signal is not obviously doing you a favour.

Category 2: Good evidence of no meaningful benefit

Multivitamins, taken to live longer

This is the biggest single line item in most people's supplement spending, and the evidence is now substantial.

An analysis led by the US National Cancer Institute pooled three large prospective cohorts totalling 390,124 generally healthy adults with no history of cancer or chronic disease, followed for more than 20 years, during which 164,762 deaths occurred. Daily multivitamin users had no lower risk of death from any cause than non-users, with no differences in mortality from cancer, heart disease or cerebrovascular disease. The analysis adjusted for diet quality, education, ethnicity and other confounders, and specifically addressed the "healthy user" effect that has muddied earlier studies [5,6].

The USPSTF separately concluded that evidence is insufficient to determine the balance of benefits and harms of multivitamin supplementation for preventing cardiovascular disease or cancer [1,2].

The nuance that matters

This does not mean multivitamins are useless for everyone. They were not tested in people with documented deficiencies, and the study population was generally healthy and well-nourished. A multivitamin remains a defensible insurance policy for someone whose eating pattern is genuinely chaotic — shift workers are the clearest example, and we say so in our shift work supplements guide.

What it does mean is that taking a daily multivitamin as a longevity intervention, in a reasonably fed adult, has been tested at scale and did not deliver. If that is your rationale, the money is better spent elsewhere. Browse multivitamins if you want one for gap-filling — just not for lifespan.

Resveratrol for healthy ageing

A prospective study followed 783 community-dwelling adults aged 65 and over in the Chianti region of Italy for around nine years, measuring urinary resveratrol metabolites as an objective marker of exposure. Total resveratrol metabolite concentration was not associated with inflammatory markers, cardiovascular disease or cancer, and did not predict all-cause mortality [7].

We sell resveratrol and have written about this at length in does resveratrol actually work? There is a modest signal in type 2 diabetes; there is no good case for it as a healthy-ageing intervention.

Collagen for skin, on the higher-quality evidence

A 2025 systematic review and meta-analysis in the American Journal of Medicine pooled 23 randomised controlled trials with 1,474 participants. Overall, collagen improved skin hydration, elasticity and wrinkles. But when studies were separated by funding source, trials not receiving industry funding showed no effect — and high-quality studies likewise showed no significant effect in any category. The authors concluded there is currently no clinical evidence supporting collagen supplements to prevent or treat skin ageing [8].

We sell collagen too. Our full assessment is in supporting skin ageing from the inside: plausible mechanism, contested evidence, low risk, reasonable to trial — but not before sun protection and adequate dietary protein.

Category 3: Unproven rather than disproven

This is the largest category and the one most often misrepresented in both directions. These compounds have not failed. They have mostly not been properly tested in humans at consumer doses for meaningful outcomes.

Our position on this tier is not "don't buy them". It is: buy them knowingly, as speculative purchases, with money you can afford to have wasted — and never before the well-evidenced basics are covered.

Why this tier is the most misrepresented

Sellers treat "not yet disproven" as though it were "proven". Critics treat it as though it were "debunked". Both are wrong, and the distinction matters for how you spend.

A useful way to think about it: these are options, not investments. You are paying a premium for the possibility that a mechanism translates. Sometimes it will. Historically, most of the time it has not — which is why the sensible allocation is small, late, and only after the things with actual outcome data are in place.

Category 4: Works — but not for what it's sold for

Some supplements have genuine evidence attached to a different question from the one the marketing answers.

Category 5: Format and marketing failures

Sometimes the ingredient is fine and the product is the problem.

Proprietary blends

If a label gives a blend total rather than per-ingredient amounts, you cannot verify that anything is present at a studied dose. Blends exist to obscure that. See supplement fillers explained.

Underdosed everything

A great many products contain a studied ingredient at a fraction of the studied dose. This is the single most common way a legitimate ingredient becomes a useless product.

Products that don't contain what they claim

This is not hypothetical. Independent analysis of commercial NMN supplements found measured content deviating from label claim by between −100% and +11.2%, with some products containing no detectable NMN at all [10]. The defence is a batch-specific certificate of analysis from a named independent lab — see how to read a certificate of analysis and third-party tested supplements.

Greens powders as a vegetable substitute

Marketed as replacing servings of vegetables, they typically deliver a fraction of the fibre and volume, at many times the cost of frozen veg. There is no trial showing they produce the outcomes associated with eating vegetables.

"Detox" and "cleanse" products

Your liver and kidneys perform detoxification continuously. No supplement has been shown to improve on that in healthy people, and the term has no clinical meaning.

Premium delivery formats without outcome data

Liposomal and sublingual formats command a premium on absorption arguments. Improving a blood level is not the same as improving an outcome, and the clinical evidence for superior results is thinner than the pricing implies — see liposomal NMN and sublingual NMN.

What to spend the money on instead

First, how the industry will respond to this article

Worth knowing, because you will encounter these rebuttals and most of them are weak:

• "The dose was too low." Sometimes legitimate. But it becomes unfalsifiable when every failed trial is explained by dosing, and no dose is ever specified in advance as the one that should work.
• "The wrong form was used." Also sometimes legitimate — trans-resveratrol versus cis, for instance. But if a specific form is required, the burden is on the seller to show that form works, not on the buyer to assume it.
• "The study population was already healthy." A fair point, and one we have applied ourselves above regarding multivitamins. It cuts both ways: if a supplement only helps deficient people, it should be sold for deficiency, not for longevity.
• "Observational studies can't prove anything." True, but the USPSTF conclusions rest on randomised trials [1,2], and the multivitamin cohort specifically addressed confounding and reverse causation [5,6].
• "Absence of evidence isn't evidence of absence." Correct — which is why we have a whole category above for compounds that are unproven rather than disproven. It is not a defence for compounds that have been tested and failed.

The boring things that actually have evidence

The frustrating truth is that the things with the best evidence are cheap and unexciting.

And the free interventions still outperform everything on this page: sleep, resistance training twice a week, zone 2 cardio, not smoking, and daily sun protection [3].

Where we are sceptical about our own shelves

It would be easy to write this article about other people's products. Here is the same standard applied to ours:

• Collagen. We sell it. The higher-quality and independently funded trials do not support it for skin ageing [8]. Reasonable to trial; not a priority purchase.
• Resveratrol. We sell it. The healthy-ageing case is weak [7], and the pharmaceutical programme built on it was abandoned. Low-conviction bet only.
• NMN. We sell it, including a 1,000 mg product. It reliably raises NAD⁺, but the trials showing functional benefits used 250 mg, and meta-analysis found no metabolic benefit [9]. Belongs late in a stack.
• Spermidine, PQQ, and similar. We sell these. They are mechanistically interesting and clinically unproven at consumer doses. Buy them knowing that.
• Multivitamins. We sell them. They are gap-fillers, not longevity interventions [5,6].

If that costs us sales to people who should be buying vitamin D and creatine instead, that is the right outcome. Our full range sits in Welzo Ultra Purity and longevity supplements, and our honest assessments in the longevity supplements guide, the longevity stack guide and how long supplements take to work.

When to speak to a doctor

Speak to your GP or pharmacist before starting or stopping any supplement if you take prescription medication, have an existing medical condition, or are pregnant or breastfeeding. Do not stop prescribed medication in favour of a supplement.

If you are buying supplements because of a symptom — fatigue, low mood, brain fog, hair loss, poor sleep — investigate the symptom rather than treating it speculatively. Iron deficiency, thyroid dysfunction, B12 deficiency, sleep apnoea and depression are all common, all treatable, and none respond to longevity compounds. A tiredness and fatigue blood test, thyroid blood test or ferritin blood test will tell you more than any capsule.

Frequently asked questions

Which longevity supplements don't work?

The strongest negative evidence applies to beta-carotene and high-dose vitamin E, both of which carry an active recommendation against use for cardiovascular disease or cancer prevention from the US Preventive Services Task Force [1,2]. Multivitamins showed no mortality benefit in an analysis of 390,124 adults over more than 20 years [5,6]. Resveratrol showed no association with mortality, cardiovascular disease, cancer or inflammation in a nine-year prospective study [7]. Collagen for skin showed no effect in independently funded and higher-quality trials [8].

Are multivitamins a waste of money?

For extending life or preventing chronic disease in a reasonably nourished adult, the evidence says they do not deliver — no mortality benefit across 390,124 adults followed more than two decades [5,6]. They remain a reasonable gap-filler for people with genuinely erratic eating, such as shift workers, or documented deficiencies. The distinction is what you are buying them for.

Is beta-carotene actually harmful?

For disease prevention, the USPSTF concluded with moderate certainty that harms outweigh benefits, citing adequate evidence that beta-carotene increases lung cancer risk in people already at increased risk, such as smokers [1,2]. Beta-carotene from food is not the concern here — this applies to supplementation.

Do antioxidant supplements slow ageing?

The evidence does not support it. The two most tested antioxidant supplements carry recommendations against use for prevention [1,2], beta-carotene produced no effect on skin ageing in a randomised trial where sunscreen produced a 24% reduction [3], and one trial found resveratrol blunted exercise training adaptations [4]. Reactive oxygen species also act as useful signalling molecules, which may explain why blanket suppression does not help.

Does that mean all longevity supplements are pointless?

No. Vitamin D has clear population-level guidance behind it [11,12], and creatine has one of the largest evidence bases of any supplement ingredient with a strong safety record [13,14]. Omega-3 has established intake recommendations [15,16]. The problem is not supplements as a category — it is the gap between what the well-evidenced ones cost and how little attention they get versus the exciting ones.

What about spermidine, fisetin and urolithin A?

These sit in the "unproven rather than disproven" tier. They have mechanistic and preclinical support and limited human outcome data at consumer doses. That is not the same as being debunked. Buy them as speculative purchases if you want to, after the basics are covered, and with realistic expectations.

Why do supplements with weak evidence sell so well?

Because it is cheap to sell a mechanism and expensive to test an outcome, and because positive findings get publicised while null results do not. A mouse study can become a product page within weeks; the human trial that would settle the question may never be funded at all.

Is my supplement even real?

Worth checking. Independent analysis of commercial NMN supplements found content deviating from label claim by between −100% and +11.2%, with several products containing no detectable active ingredient [10]. Demand a batch-specific certificate of analysis from a named independent laboratory, and check the lot number matches your bottle.

Should I take a supplement "just in case"?

Generally no. The "just in case" logic is how people end up with twelve bottles, meaningful cost, and no idea what any of them are doing. Test for a deficiency, correct what you find, and cover the small number of well-evidenced items — see our minimal supplement stack.

What has the best evidence per pound spent?

Creatine monohydrate and vitamin D3, comfortably. Both cost a few pounds a month, both have substantial evidence bases [11,12,13,14], and both are routinely skipped by people spending far more on compounds with far less behind them. Our cheap longevity stack builds the whole thing for around £30 a month.

References

1. US Preventive Services Task Force; Mangione CM, Barry MJ, et al. Vitamin, Mineral, and Multivitamin Supplementation to Prevent Cardiovascular Disease and Cancer: US Preventive Services Task Force Recommendation Statement. JAMA. 2022;327(23):2326–2333. https://pubmed.ncbi.nlm.nih.gov/35727271/
2. US Preventive Services Task Force. Vitamin, Mineral, and Multivitamin Supplementation to Prevent Cardiovascular Disease and Cancer: Preventive Medication. Recommendation statement. https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/vitamin-supplementation-to-prevent-cvd-and-cancer-preventive-medication
3. Hughes MCB, Williams GM, Baker P, Green AC. Sunscreen and prevention of skin aging: a randomized trial. Annals of Internal Medicine. 2013;158(11):781–790. https://www.acpjournals.org/doi/10.7326/0003-4819-158-11-201306040-00002
4. Gliemann L, Schmidt JF, Olesen J, et al. Resveratrol blunts the positive effects of exercise training on cardiovascular health in aged men. The Journal of Physiology. 2013;591(20):5047–5059. https://physoc.onlinelibrary.wiley.com/doi/abs/10.1113/jphysiol.2013.258061
5. Loftfield E, O'Connell CP, Abnet CC, et al. Multivitamin Use and Mortality Risk in 3 Prospective US Cohorts. JAMA Network Open. 2024;7(6):e2418729. https://pubmed.ncbi.nlm.nih.gov/38922615/
6. National Cancer Institute. For healthy adults, taking multivitamins daily is not associated with a lower risk of death. National Institutes of Health, 2024. https://www.cancer.gov/news-events/press-releases/2024/multivitamins-do-not-lower-risk-of-death
7. Semba RD, Ferrucci L, Bartali B, et al. Resveratrol levels and all-cause mortality in older community-dwelling adults. JAMA Internal Medicine. 2014;174(7):1077–1084. https://pubmed.ncbi.nlm.nih.gov/24819981/
8. Myung SK, Park Y. Effects of Collagen Supplements on Skin Aging: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. The American Journal of Medicine. 2025. https://www.amjmed.com/article/S0002-9343(25)00283-9/abstract
9. Effects of Nicotinamide Mononucleotide on Glucose and Lipid Metabolism in Adults: A Systematic Review and Meta-analysis of Randomised Controlled Trials. Current Diabetes Reports. 2024. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11557618/
10. NUS Medicine. Significant discrepancies between actual and labelled amount of anti-ageing ingredients in supplements. National University of Singapore, 2024. https://medicine.nus.edu.sg/news/significant-discrepancies-between-actual-and-labelled-amount-of-anti-ageing-ingredients-in-supplements-nus-medicine-study/
11. NHS. Vitamin D — Vitamins and minerals. https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/
12. British Heart Foundation. Vitamin D: deficiency, supplements, sunlight and diet. https://www.bhf.org.uk/informationsupport/heart-matters-magazine/nutrition/ask-the-expert/vitamin-d
13. Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition. 2017;14:18. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5469049/
14. The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis. Frontiers in Nutrition. 2024;11:1424972. https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2024.1424972/full
15. EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific Opinion on the Tolerable Upper Intake Level of EPA, DHA and DPA. EFSA Journal. 2012;10(7):2815. https://efsa.onlinelibrary.wiley.com/doi/abs/10.2903/j.efsa.2012.2815
16. An overview of national and international long chain omega-3 polyunsaturated fatty acid intake recommendations for healthy populations. Nutrition Research Reviews, Cambridge University Press. Read on Cambridge Core
17. Derbyshire E. Micronutrient Intakes of British Adults Across Mid-Life: A Secondary Analysis of the UK National Diet and Nutrition Survey. Frontiers in Nutrition. 2018;5:55. https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2018.00055/full

All product photography in this article is owned by Welzo and served from the Welzo media library. Evidence positions described are correct at the time of publication.