The 5 Best Methylated B Complex Supplements in the UK (2026)

What makes a methylated B complex worth buying?

Look for active forms across the whole complex, a complete set of all eight B vitamins at meaningful doses, an honest label with no proprietary blends, and manufacturing to recognised UK standards.

"Methylated" simply means a vitamin is supplied in its active, body-ready form, carrying the methyl group your body would otherwise have to add itself.1 The trouble is that many products labelled "methylated" only use the active form for one or two nutrients (usually folate) and fall back to cheaper standard forms for the rest. We judged each product on five things:

• Active forms throughout: methylcobalamin (B12), L-5-MTHF (folate), P5P (B6), riboflavin-5-phosphate (B2) and, ideally, benfotiamine (B1).
• A complete complex: all eight B vitamins, not a partial blend.
• Meaningful, sensible doses you can actually see on the label.
• Transparency: every ingredient and amount listed, with no hidden "blends".
• Quality and value: made to UK GMP standards, suitable for vegans, and fairly priced, ideally with a guarantee.

The 5 best methylated B complex supplements (UK)

1. Prime Vitality Methylated B Complex Ultra Best overall

All eight B vitamins in their active forms, plus benfotiamine, inositol and BioPerine, in one tablet a day. Made in Britain, fully transparent, and backed by a money-back guarantee.

This is our own formula, so treat this as our informed and transparent view rather than an independent test (more on that below). We built it to tick every box on the checklist above. It uses methylcobalamin (B12), L-5-MTHF folate, P5P (B6) and riboflavin-5-phosphate (B2), and adds benfotiamine, a fat-soluble form of vitamin B1. Because it is fat-soluble rather than water-soluble, benfotiamine is absorbed more readily and has been shown to raise blood levels of thiamine markedly more than standard B1, which is why we use it in place of ordinary thiamine.4 Many complexes leave it out. Every amount is printed on the label, it is vegan, non-GMO and made in a UK facility to GMP standards, and it comes with a money-back guarantee and a subscribe-and-save option.

Best for: anyone who wants the active form of every B vitamin in a single daily tablet, with nothing hidden. Watch-outs: as a premium active formula it is not the cheapest per tablet, and it is sold direct rather than on the high street.

2. Lamberts Methyl B Complex Heritage UK brand

A genuinely well-formulated methylated complex from a respected UK practitioner brand, using methylfolate, P5P and methylcobalamin.

Lamberts is a long-established British supplement brand, and its Methyl B Complex uses methylfolate (as Quatrefolic), pyridoxal-5-phosphate (P5P) and methylcobalamin rather than the cheaper standard forms.5 It is a strong, trustworthy option. The clearest formula difference from our pick is benfotiamine, the fat-soluble form of B1 that absorbs better and raises blood thiamine further than standard B1;4 we include it, and it is not listed in the Lamberts formula. Our formula also adds inositol and BioPerine, plus a money-back guarantee and subscription pricing. If you want a methylated complex from a heritage name, this is an excellent choice.

3. Igennus Super B-Complex Sustained release

A science-led, vegan methylated complex with sustained-release technology, designed to release the B vitamins gradually.

Igennus formulates with bioactive, methylated B vitamins, including methylfolate, methylcobalamin and P5P, and uses a sustained-release delivery in small tablets, manufactured to UK GMP.6 It is a well-made, thoughtfully designed product. It typically uses a smaller per-dose approach taken across the day rather than a single one-a-day tablet, so the right choice here comes down to whether you prefer sustained release or a simple once-daily dose.

4. Nu U Nutrition Vitamin B Complex Best value all-rounder

A complete, all-eight B complex at a budget-friendly price, often with around a six-month supply per bottle.

If your priority is covering all eight B vitamins cheaply, a value brand like Nu U Nutrition does the job and lasts a long time per bottle. The trade-off with most budget complexes is the forms: they tend to use standard folic acid and cyanocobalamin rather than the active, methylated versions, so if methylation is the reason you are shopping, check the label carefully before buying.

5. A standard high-street B complex Simple top-up

The own-brand or pharmacy B complex you can pick up anywhere. Cheap and convenient, but usually built on standard forms.

Most supermarket and pharmacy B complexes use folic acid, cyanocobalamin and pyridoxine at modest doses. For a lot of people with a varied diet, that is perfectly fine.1 They are the cheapest and most convenient option. They are simply not the right pick if you specifically want the active, methylated forms or higher, clearly-stated doses.

At a glance

Comparison based on publicly listed formulations at the time of writing (June 2026). Always check the current label.

Why Prime Vitality comes out on top

The shortlist is genuinely strong, Lamberts and Igennus in particular. Our formula earns first place because it is the most complete on every criterion at once: the active form of all eight B vitamins, the addition of benfotiamine for B1, full dose transparency, UK manufacturing, vegan and non-GMO status, a simple one-a-day tablet, and a money-back guarantee.

How to choose the right one for you

If you want the most complete active formula in one daily tablet, our pick is the natural fit. If you prefer a heritage practitioner brand, Lamberts is excellent. If you like the idea of sustained release, look at Igennus. If budget is the priority and you are happy with standard forms, a value or high-street complex will cover the basics. Whichever you choose, the single most important active form to look for is methylfolate rather than folic acid.2

Frequently asked questions

References

1. NHS. B vitamins and folic acid.
2. NIH Office of Dietary Supplements. Folate Fact Sheet for Health Professionals.
3. NIH Office of Dietary Supplements. Vitamin B12 Fact Sheet for Health Professionals.
4. Loew D. Pharmacokinetics of thiamine derivatives, especially benfotiamine. Int J Clin Pharmacol Ther, 1996.
5. Lamberts Healthcare. Methyl B Complex (product information).
6. Igennus Healthcare Nutrition. Super B-Complex (product information).