Best TMG (Trimethylglycine) Supplement UK: Buyer's Guide

Vitality Supplements · Buyer's Guide

Best TMG Supplement UK

A practical UK buyer's guide to choosing a TMG (trimethylglycine, also called betaine anhydrous) supplement — the dose per serving, the purity of the betaine, why it is often paired with NMN, and how to judge testing and value. TMG is sold as a food supplement in the UK.

Last updated July 2026 · Written by Vitality Supplements Editorial Team · How to choose · 7 min read
Food supplement information — not medical advice
UK manufactured ISO/IEC 17025 batch tested Betaine anhydrous CoA on request
Quick answer
How do I choose the best TMG supplement in the UK?
Look for a clearly stated dose of TMG per serving, betaine anhydrous as the source with a stated purity, and independent batch testing with a Certificate of Analysis. Many buyers choose TMG to take alongside NMN, so a combined NMN + TMG formula can be more convenient and better value than buying each separately. TMG (trimethylglycine) is the same compound as betaine anhydrous, and is sold as a food supplement in the UK.
Key takeaways
  • TMG (trimethylglycine) and betaine anhydrous are the same compound — check the label states it clearly.
  • The key figures are the mg of TMG per serving and the purity of the betaine.
  • TMG is commonly paired with NMN, so a combined formula can be more convenient and better value.
  • Independent batch testing and a Certificate of Analysis matter more than marketing language.
  • UK manufacture adds traceability and clearer labelling.
  • TMG is a food supplement in the UK. For the science, see our what is TMG guide.
The checklist

What to look for in a TMG supplement

TMG is a simple compound to buy well, provided the label is honest about how much betaine it contains and where it comes from. Because so many buyers take it as part of an NMN routine, the pairing and the value of a combined formula are worth weighing up. For the underlying science, see our companion what is TMG guide.

  • A clearly stated TMG dose — the mg of trimethylglycine per serving, not just a total formula weight.
  • Betaine anhydrous source — the label should name betaine anhydrous and, ideally, its purity.
  • Sensible NMN pairing — if you take NMN, a combined NMN + TMG formula saves buying two products.
  • Independent, accredited testing — batch tested by an ISO/IEC 17025-accredited laboratory.
  • Certificate of Analysis on request — batch-level proof of content and purity.
  • Clean formulation — minimal fillers and clear allergen information.
  • Honest value — compare cost per gram of TMG, and factor in any NMN included.
Trimethylglycine is betaine anhydrous — a clear label should say so.
Side by side

TMG buying criteria compared

Use this scorecard when comparing TMG products in the UK. A product worth buying gives a clear, verifiable answer to every row.

Buying criterion What to look for Why it matters
Dose per serving Stated mg of TMG (trimethylglycine) Tells you what you are actually getting per serving
Source & purity Betaine anhydrous, purity stated Confirms the compound and its grade
NMN pairing Combined NMN + TMG formula if you take NMN More convenient and often better value than two products
Testing Batch tested by an ISO/IEC 17025 lab Independently confirms identity and purity
Certificate of Analysis Batch-specific, on request Documentary proof of what is in the bottle
Formulation Capsule, minimal excipients, allergen info Cleaner product, easier to assess
Value Cost per gram of TMG Fair comparison, especially in combined formulas
Manufacture UK-made to GMP Traceability and clearer labelling
How our product measures up

Why our TMG meets the criteria

Our NMN + TMG 1500mg Complex provides 750 mg of trimethylglycine (betaine anhydrous) alongside 750 mg of NMN per serving, which suits the many buyers who want both in one capsule rather than two separate bottles. It is UK-manufactured, and every batch is independently tested by an ISO/IEC 17025-accredited laboratory with a Certificate of Analysis available on request.

We describe it by its specification — dose, source, testing and origin — rather than by claimed effects, because TMG is a food supplement. If you want the science first, read what is TMG; to see how it fits a wider routine, see our best longevity supplements UK guide.

Buyer questions

TMG buying FAQ

Look for a clearly stated mg of TMG per serving, betaine anhydrous named as the source with a purity figure, independent ISO/IEC 17025 testing and a Certificate of Analysis on request. If you also take NMN, a combined formula can be more convenient and better value.
Yes. TMG (trimethylglycine) is the same compound as betaine anhydrous. Labels may use either name, so it is worth checking both so you do not accidentally buy the same thing twice or compare products on different names.
Products commonly provide anywhere from around 500 mg up to a few grams of TMG per serving. What matters when comparing is that the label states the actual TMG amount clearly. There is no single official figure, so this reflects what products offer rather than advice on how much to take.
TMG is a methyl donor, and many people who take NMN choose to take it alongside as part of the same routine. That is why combined NMN + TMG formulas are common: for those buyers, one capsule covering both is simpler and often cheaper than two separate products. If you do not take NMN, a standalone TMG is fine.
Ask for a Certificate of Analysis for the batch and check that testing was done by an ISO/IEC 17025-accredited laboratory. The certificate should confirm the identity and purity of the betaine anhydrous. UK manufacture to GMP standards adds further traceability.
Compare the cost per gram of TMG across products. In combined NMN + TMG formulas, factor in the NMN you would otherwise buy separately — a combined product can work out cheaper overall than two single-ingredient bottles.

TMG, done properly

Our NMN + TMG 1500mg Complex provides 750mg trimethylglycine (betaine anhydrous) with 750mg NMN per serving, UK-manufactured and independently batch tested, with a Certificate of Analysis available on request.

Shop NMN + TMG Complex → Read: What is TMG?
Continue reading

About the author. This guide was written and reviewed by the Vitality Supplements Editorial Team, a UK supplement manufacturer. Every batch we produce is independently tested by an ISO/IEC 17025-accredited laboratory, with a Certificate of Analysis available on request.

This article is for general information about food supplements and is not medical advice. TMG (trimethylglycine) is sold as a food supplement in the UK and this guide makes no health or disease claims. Always consult a qualified healthcare professional before starting any supplement, particularly if you are under 18, pregnant, breastfeeding, taking medication or managing a health condition.