Written and medically reviewed by Dr Zeeshan Afzal (MBBS) — Medical Doctor & Medical Content Lead, Welzo
Evidence-based · Honest about what's proven and what isn't · UK-focused
Last updated: July 2026 · Reading time: ~9 minutes
Heights markets its gut product around the gut-brain connection. That connection is real biology — and it's also where supplement marketing most often outruns the evidence. Our digestive health guides cover what's actually established, and the probiotics range and wider gut health supplements are there if you want to compare products directly.
Table of contents
Heights Biotic is a subscription synbiotic — a multi-strain probiotic paired with a prebiotic, from a UK brand whose wider positioning is built around cognitive and mental wellbeing.
Welzo Ultra Purity Akkermansia is a one-off purchase built around a next-generation organism, Akkermansia muciniphila, alongside Lactobacillus acidophilus, inulin, berberine, astaxanthin and chromium.
We haven't quoted Heights' price, strain count or potency here — those change and we couldn't verify them. Check the label directly rather than trusting figures in any comparison article, including this one.
The gut-brain axis is not marketing. There is genuine two-way communication between gut and brain via the vagus nerve, immune signalling and microbial metabolites, and the field is taken seriously — see the gut-brain connection and the vagus nerve.
What follows from that is where care is needed.
If you're struggling with your mental health, that deserves proper support — a GP conversation, and the treatments that actually have evidence. A probiotic is not a substitute, and no supplement should be marketed as one.
There is a gut-brain link with genuine clinical footing, and it's rarely the one being marketed.
Some Lactobacillus species produce D-lactate, a form of lactic acid humans clear slowly. In people with short bowel syndrome or extensive small intestinal resection, D-lactate can accumulate and cause D-lactic acidosis — which produces neurological symptoms including confusion, slurred speech and unsteadiness.
That is a real, documented gut-to-brain effect from bacteria. It's also rare, and largely confined to that surgical population.
Custom Probiotics D-Lactate Free — £148.49 · 114 reviews · Available from Welzo. A strain selection that excludes D-lactate producers. Most people do not need this. If you have short bowel syndrome or have had extensive bowel surgery, it's a genuine consideration and one for your specialist rather than self-selection. Outside that setting the premium is hard to justify — see probiotic powders.
Welzo Ultra Purity Akkermansia — from £21.99 (from £39.99) · 92 reviews · Available from Welzo. Per two-capsule serving: Akkermansia at 60 billion AFU, L. acidophilus at 64 billion CFU, berberine 700mg, inulin 200mg, astaxanthin 2.4mg and chromium 10µg — all quantities disclosed rather than hidden in a blend.
The design logic: Akkermansia lives in the gut's mucus layer while L. acidophilus occupies the lumen, so the two aren't competing for the same ground — see Akkermansia vs traditional probiotics.
Three things to be clear-eyed about. Akkermansia rests on a younger evidence base than conventional lactic acid strains — it's an emerging area built on a small number of human studies. The inulin is 200mg, which is formulation-level rather than a prebiotic dose, since prebiotic research uses grams. And the berberine at 700mg carries a real interaction profile that a plain synbiotic doesn't — covered in the safety section below.
This is the least scientific difference and possibly the most practical.
A subscription guarantees you don't run out, which genuinely helps adherence — the thing most supplement routines fail at. It also keeps charging you whether or not the product is working, and is harder to stop than simply not reordering.
A one-off purchase makes you decide again each month. That's friction, but it's also a natural review point: if you've felt nothing after eight weeks, you notice.
Neither is better. But if you've ever kept paying for something out of inertia, that's worth weighing before signing up to anything recurring.
| Feature | Heights Biotic | Welzo Akkermansia |
|---|---|---|
| Type | Multi-strain synbiotic | Next-gen organism plus actives |
| Positioning | Gut-brain and wellbeing | Gut barrier and metabolic |
| Purchase | Subscription | One-off |
| Quantities disclosed | Check the label | Yes — every ingredient |
| Additional actives | Prebiotic | Berberine, astaxanthin, chromium |
| Interaction checking needed | Minimal | Yes — berberine |
| Evidence maturity | Conventional strains, longer record | Emerging for Akkermansia |
Klaire Labs Ther-Biotic Complete — £50.63 (from £59.00) · 94 reviews · Available from Welzo. A practitioner-facing multi-strain formula combining Lactobacillus and Bifidobacterium species — the closest thing in stock to the conventional synbiotic approach, without a subscription.
Both are well tolerated by most people, with mild bloating or wind in the first fortnight the usual reports — see probiotic side effects.
Speak to a doctor before taking either if you
More in probiotics safety.
On labelling: probiotics carry no authorised health claim in GB or the EU — including for mood, cognition or mental wellbeing. Both are sold as food supplements and cannot legally be marketed as treating any condition.
See your GP — or seek urgent help — if you have:
See when to see a GP. For mental health support, Samaritans are available free on 116 123, day or night.
They're different approaches rather than better and worse. Heights uses conventional strains with a longer research record; the Welzo formula uses a next-generation organism with a younger evidence base plus additional actives. We sell one of them, so weigh that accordingly.
The gut-brain axis is real, but research on probiotics for mood is early — small trials, short durations, inconsistent results. Don't buy one expecting a mental health effect, and never replace prescribed treatment with a supplement.
Some Lactobacillus species produce it, and in people with short bowel syndrome it can accumulate and cause neurological symptoms. It's rare and largely confined to that group — most people don't need a D-lactate free product.
It's an additional active alongside the two organisms — and the ingredient that most needs checking against prescription medication before you start.
No. Prebiotic research uses gram quantities, so that's roughly a hundredth of a studied dose. Treat it as supporting the formulation rather than delivering a prebiotic effect.
It helps adherence, which genuinely matters. It also keeps charging whether or not the product works. If you tend to keep paying out of inertia, a one-off purchase gives you a monthly decision point.
There's no safety reason not to, but little logic — you'd be paying twice and unable to attribute any change. Check the berberine interactions either way.
Neither is built for IBS. That evidence attaches to specific strains such as Lp299v and B. longum 35624 — see supplements for IBS.
At least four weeks of consistent use. If you've felt nothing after eight, that's useful information — see how long probiotics take to work.
Sleep, physical activity, managing stress, and a varied high-fibre diet. Unglamorous, better evidenced than any probiotic, and free.
Medical disclaimer: This article is for general information and education only and does not constitute medical advice, diagnosis or treatment. Welzo sells Akkermansia and does not sell Heights; this conflict of interest is disclosed above and no winner is declared. No Heights pricing, strain count or potency figures are quoted, as these change and could not be verified at the time of writing. Food supplements are not a substitute for a varied and balanced diet, and are not intended to diagnose, treat, cure or prevent any disease. Probiotics carry no authorised health claim in GB or the EU, including for mood, cognition or mental wellbeing. If you are struggling with your mental health, speak to your GP; never stop or alter prescribed treatment in favour of a supplement. Products containing berberine interact with numerous medicines and must be avoided in pregnancy and breastfeeding. D-lactic acidosis is a recognised complication of short bowel syndrome and should be managed by a specialist. New confusion, slurred speech or unsteadiness requires urgent medical assessment. Prices, review counts and availability are correct at the time of writing.
About the author
Dr Zeeshan Afzal (MBBS) is a practising medical doctor and Welzo's Medical Content Lead. He writes and reviews Welzo's health content to ensure it is accurate, evidence-based and aligned with current UK clinical guidance.
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