Prime Vitality · The Science

The science behind Methylated B Complex Ultra

Active, body-ready B vitamins, in the forms your body is built to use.

Most B vitamins need converting before your body can use them. We worked with formulation experts to start with the active, methylated forms instead, so they are ready to work from the very first tablet.

  • ✓Active methylated forms
  • ✓Body-ready actives
  • ✓Meaningful, transparent doses
  • ✓Grounded in published research
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Why "active forms" matter

The difference is in the chemistry.

Vitamins on a label are not always ready to work the moment you swallow them. Many B vitamins are an inactive starting material: before your cells can use them, your body has to convert them into their active coenzyme form through a series of steps.

That conversion depends on enzymes, other nutrients and your own genetics, and some people carry out certain steps less efficiently than others. When a supplement uses cheaper inactive forms, more of the work is left to your body.

Methylated B Complex Ultra is built the other way around. Wherever it counts, we start with the active, body-ready forms, so there is less for your body to convert:

Common form → the form we use

  • Folic acidL-5-MTHF folate
  • CyanocobalaminMethylcobalamin B12
  • PyridoxineP5P (active B6)
  • RiboflavinRiboflavin-5-Phosphate
  • Standard thiamineBenfotiamine (fat-soluble B1)

Why benfotiamine, not standard thiamine?

Standard thiamine (vitamin B1) is water-soluble, so the body absorbs only a limited amount at once and clears the rest. Benfotiamine is a fat-soluble form of B1 that crosses into the body far more readily and stays available for longer, so more of every dose actually reaches your cells.

It is the same thinking behind our active folate and methyl-B12: better absorbed, with less left for your body to do.

Methylation, and the gene that changes the picture

Why the form of folate you take really matters.

Right now, deep inside your cells, a process called methylation is happening countless times a second. It is how your body builds DNA, regulates which genes switch on and off, makes neurotransmitters, and keeps a compound called homocysteine in balance. Folate (B9), B12 and B6 are the nutrients that keep this cycle turning.

Here is the catch. Ordinary folic acid is not active. Your body has to convert it through several steps, and the final step relies on an enzyme called MTHFR. A very common variation in the MTHFR gene (known as C677T) lowers how well that enzyme works, so some people convert folic acid into usable folate more slowly.

Two routes to the same active folate

Ordinary B-complex Folic acid · Vitamin B9

Relies on the MTHFR enzyme, which works more slowly for people with the common gene variant.

Prime Vitality L-5-MTHF · active Vitamin B9

Already active, so it skips the MTHFR step entirely, whatever your genes.

Same destination, fewer steps. We start with the active form, so your body doesn't have to rely on the MTHFR enzyme.

The folate in Methylated B Complex Ultra is already in its active form, L-5-MTHF (L-methylfolate). Because it is the form your body actually uses, its delivery of active folate does not depend on the MTHFR step at all. It is paired with active methylcobalamin B12 and P5P B6 to support the wider cycle.

50%

Across many Western populations, around half of people carry at least one copy of the common MTHFR C677T gene variant, which can make it harder to turn folic acid into the active folate your body uses. Because L-5-MTHF is already active, it does not depend on this step.

Source: prevalence of the MTHFR C677T gene variant, US Centers for Disease Control and Prevention, "MTHFR Gene Variant and Folic Acid Facts"; and Wilcken B et al., Journal of Medical Genetics, 2003.

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The formula, ingredient by ingredient

Ten actives. One tablet a day.

The form we use

Benfotiamine is a fat-soluble form of vitamin B1 (thiamine). Most B1 supplements use water-soluble thiamine salts, whose absorption is naturally capped. Because benfotiamine is lipid-soluble, research has reported it reaches the bloodstream far more readily.

What it does

In the body, thiamine becomes thiamine pyrophosphate, a coenzyme your cells use to turn carbohydrates into usable energy. It also supports the normal workings of the nervous system and the heart.

Key benefits

  • ✓Thiamine contributes to normal energy-yielding metabolism
  • ✓Contributes to the normal functioning of the nervous system
  • ✓Contributes to normal psychological function
  • ✓Contributes to the normal function of the heart
What the research shows

Because it is fat-soluble, benfotiamine is absorbed more readily than ordinary thiamine: pharmacokinetic studies report substantially higher blood thiamine levels from benfotiamine than from the same dose of thiamine salts. That is the basis for its reputation as a more bioavailable form of vitamin B1.

The form we use

Riboflavin-5-Phosphate is the active coenzyme form of vitamin B2, the form B2 has to be converted into before it can do its job. We use it ready-made.

What it does

As the coenzymes FAD and FMN, riboflavin sits at the heart of how your cells produce energy. It also has a quiet but crucial role: riboflavin is needed to activate vitamin B6 and to run the MTHFR enzyme in folate metabolism, which is exactly why it belongs in a methylation-focused formula.

Key benefits

  • ✓Contributes to normal energy-yielding metabolism
  • ✓Contributes to the maintenance of normal skin
  • ✓Contributes to the reduction of tiredness and fatigue
  • ✓Contributes to the protection of cells from oxidative stress
What the research shows

Riboflavin is the hidden link in the methylation story: in its FAD form it is the very cofactor the MTHFR enzyme needs to make active folate, and it is also required to activate vitamin B6. University of Ulster research has shown riboflavin status interacts directly with the common MTHFR variant.

The form we use

Niacinamide (nicotinamide) is a gentle, flush-free form of vitamin B3. Unlike nicotinic acid, it does not tend to cause the warm, tingling "niacin flush".

What it does

Niacin is the raw material for NAD+ and NADP+, two coenzymes involved in hundreds of reactions, most famously the ones that release energy from the food you eat and that keep cells working normally.

Key benefits

  • ✓Contributes to normal energy-yielding metabolism
  • ✓Contributes to the reduction of tiredness and fatigue
  • ✓Contributes to normal psychological function
  • ✓Contributes to the maintenance of normal skin and mucous membranes
What the research shows

Niacin's role is foundational rather than flashy: as the precursor to NAD+, it is required for the energy-producing reactions in every cell. NAD+ biology remains one of the most actively researched areas in nutrition and cellular health.

The form we use

Pantothenic acid is vitamin B5. Its name comes from the Greek pantothen, meaning "from everywhere", a nod to how widely it is involved in metabolism.

What it does

B5 is the building block of Coenzyme A, a molecule your cells cannot run the energy-producing citric-acid cycle without. It is also involved in making some hormones and neurotransmitters.

Key benefits

  • ✓Contributes to normal energy-yielding metabolism
  • ✓Contributes to normal mental performance
  • ✓Contributes to the reduction of tiredness and fatigue
  • ✓Contributes to the normal synthesis of some steroid hormones and neurotransmitters
What the research shows

Because Coenzyme A is central to so many reactions, B5 is one of the few nutrients recognised for both normal energy metabolism and normal mental performance, two things that matter when the day gets long.

The form we use

P5P (pyridoxal-5-phosphate) is the active coenzyme form of vitamin B6. Standard B6 (pyridoxine) has to be converted by the liver into P5P before it works; we provide it pre-activated.

What it does

P5P is a workhorse cofactor for well over a hundred enzymes. It is especially important for making neurotransmitters such as serotonin, dopamine and GABA, for balancing hormones, and for keeping homocysteine in check as part of the methylation cycle.

Key benefits

  • ✓Contributes to normal psychological function
  • ✓Contributes to the regulation of hormonal activity
  • ✓Contributes to normal homocysteine metabolism
  • ✓Contributes to the normal functioning of the nervous system
What the research shows

In its P5P form, B6 is the cofactor your body uses to build neurotransmitters such as serotonin, dopamine and GABA, and to help keep homocysteine in normal balance alongside folate and B12. Its own activation depends on riboflavin, which is why a complete B-complex works as a team.

The form we use

L-5-MTHF (L-methylfolate) is the active, circulating form of folate, the same form your body works hard to create from folic acid. Because it is already active, its delivery of folate does not rely on the MTHFR enzyme, and it does not leave unmetabolised folic acid in the blood.

What it does

Folate is the body's main methyl donor. It is essential for building DNA, for normal cell division, for making neurotransmitters, and for recycling homocysteine back into methionine, the engine of the methylation cycle.

Key benefits

  • ✓Contributes to normal homocysteine metabolism
  • ✓Contributes to normal psychological function
  • ✓Contributes to the reduction of tiredness and fatigue
  • ✓Contributes to normal blood formation and has a role in cell division
What the research shows

Research comparing folate forms shows L-5-MTHF raises folate status at least as effectively as folic acid, while delivering active folate independently of MTHFR genotype and without leaving unmetabolised folic acid circulating in the blood.

The form we use

Methylcobalamin is an active, body-ready form of B12 that your cells use directly in the methylation cycle. Many supplements use cyanocobalamin, a stable synthetic form that the body must first convert.

Two routes to the same active B12

Ordinary B-complex Cyanocobalamin

Has to be converted in the body before it can be used.

Prime Vitality Methylcobalamin

An active, body-ready form your cells can use directly.

What it does

B12 partners with folate to recycle homocysteine into methionine, keeping methylation running. It also supports the nervous system (it is involved in maintaining the myelin sheath around nerves) and normal red blood cell formation.

Key benefits

  • ✓Contributes to normal energy-yielding metabolism
  • ✓Contributes to the normal functioning of the nervous system
  • ✓Contributes to the reduction of tiredness and fatigue
  • ✓Contributes to normal red blood cell formation
What the research shows

Methylcobalamin is the cofactor for methionine synthase, the enzyme where the folate and B12 cycles meet. Without enough B12, folate gets "trapped" and cannot do its job, which is exactly why active folate and active B12 belong together.

The form we use

We use D-Biotin, the natural, biologically active form of biotin (vitamin B7) that the body recognises.

What it does

Biotin is a coenzyme for the carboxylase enzymes that handle fats, carbohydrates and protein. It is best known for its contribution to the maintenance of normal hair and skin.

Key benefits

  • ✓Contributes to the maintenance of normal hair
  • ✓Contributes to the maintenance of normal skin
  • ✓Contributes to normal energy-yielding metabolism
  • ✓Contributes to normal psychological function
What the research shows

We keep this one honest. Biotin is genuinely essential for normal hair and skin, and a real deficiency clearly affects them. But while biotin has a big reputation for hair and nails, strong evidence of an extra benefit in well-nourished people is limited, so we point only to its authorised role in the maintenance of normal hair and skin.

The form we use

Inositol is a naturally occurring, sugar-like compound found in your body and in many foods. It is often grouped with the B-complex vitamins as a companion nutrient.

What it does

In the body, inositol is part of the cell's internal signalling system. We include it as a traditional complement to a complete B-complex.

A note on honesty

Most inositol research uses very large doses, often several grams. At the modest 10 mg used here as a companion nutrient, we make no specific health claim for it. It rounds out the formula rather than doing the heavy lifting.

The form we use

BioPerine® is a patented black pepper extract standardised to piperine (providing 1.9 mg per tablet), a premium, well-known branded ingredient.

What it does

Piperine is the compound that gives black pepper its bite, and it is widely studied in nutrition research. We include a small, standardised amount of BioPerine® as a traditional finishing touch to the formula.

What the research shows

Piperine's reputation comes largely from a small landmark study in which it raised the bioavailability of curcumin by around 2,000% in eight volunteers. That finding is specific to curcumin, has not been widely replicated, and is not a claim about this product. We mention it only to explain why piperine is such a popular formulation ingredient.

What the research shows

A few studies that shaped how we think about B vitamins.

Brain & cognition

B vitamins slowed age-related brain shrinkage by around 30%

In the University of Oxford VITACOG trial, older adults with mild cognitive impairment who took B vitamins (folate, B6 and B12) showed on average around 30% less brain atrophy over two years than those given a placebo, with the greatest benefit in those with raised homocysteine.

Smith AD et al., PLoS ONE 20103
Active forms

Methylfolate works even with the common MTHFR variation

L-5-MTHF (methylfolate) is the active form of folate the body uses directly, so it does not depend on the MTHFR enzyme to convert it. Studies show it raises folate status effectively, including in people who carry the common MTHFR gene variation.

Lamers Y et al., Am J Clin Nutr 20064
Methylation

Folate, B6 and B12 support normal homocysteine metabolism

These three B vitamins work together in the body's methylation cycle. Folate, vitamin B6 and vitamin B12 each contribute to normal homocysteine metabolism, helping the body keep this amino acid within a healthy range.

Homocysteine Lowering Trialists' Collaboration, Am J Clin Nutr 20055
Benfotiamine

Benfotiamine is a highly absorbable form of vitamin B1

Benfotiamine is a fat-soluble form of thiamine (B1) with higher bioavailability than standard thiamine, producing greater increases in blood thiamine levels. Thiamine contributes to normal energy-yielding metabolism and the normal function of the heart and nervous system.

Loew D., Int J Clin Pharmacol Ther 19967

A note on this research: these studies investigated specific nutrients in particular groups of people. They are background on the science of the ingredients, not claims about what this product does for any individual. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle, and are not intended to diagnose, treat, cure or prevent any disease.

How we formulate

Four principles behind every tablet.

Active forms first

Methylcobalamin, L-5-MTHF, P5P, riboflavin-5-phosphate and benfotiamine, the body-ready forms.

Meaningful doses

Amounts you can see on the label, with nothing hidden behind a vague "blend".

A complete team

The B vitamins activate and support one another, so we include the whole complex, not just one or two.

Made in Britain

Vegan, non-GMO and gluten-free, manufactured to high quality standards.

Science questions, answered

The things people ask us most.

Folic acid is a synthetic, inactive form that your body must convert into active folate through several steps, the last relying on the MTHFR enzyme. L-5-MTHF is already the active form, so its delivery of folate does not depend on that conversion.

Methylated means the vitamins are in their active forms, which are easier for your body to recognise, absorb and use. This can be especially beneficial for those with gene variations that affect vitamin activation.

Standard B vitamins
Basic form→Body must convert it→Usable
Prime Vitality
Active, methylated form→Ready to use

%RI is the percentage of the daily Reference Intake, the general guideline amount. B vitamins are water-soluble, so the body uses what it needs and tends to pass the rest. Higher percentages reflect a deliberately active formula, always taken as directed: one tablet a day.

A varied, balanced diet should always come first, and a food supplement is not a substitute for one. Some people choose a B-complex to support normal energy metabolism and help reduce tiredness and fatigue, particularly if their diet, age or lifestyle means they want a reliable daily top-up of active B vitamins.

Yes. The formula is fully vegan and non-GMO. B12 is one of the nutrients most worth watching on a plant-based diet, and this provides it in the active methylcobalamin form.

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The science, in one tablet a day

Active forms. Honest doses. Made in Britain.

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References & sources

  1. European Food Safety Authority (EFSA) and the GB Nutrition and Health Claims Register: authorised health claims for the B vitamins (the permitted "contributes to…" wording), under Commission Regulation (EU) No 432/2012 as retained in GB law.

  2. Meta-analyses of population-based studies on the global prevalence of the MTHFR C677T polymorphism. The most reduced-activity "TT" form is carried by roughly 7 to 10% of people worldwide, and about 10 to 15% in many European and North American populations.

  3. Smith AD, et al. Homocysteine-lowering by B vitamins slows the rate of accelerated brain atrophy in mild cognitive impairment. PLoS ONE 2010;5(9):e12244. de Jager CA, et al. Int J Geriatr Psychiatry 2012;27(6):592-600. Douaud G, et al. PNAS 2013;110(23):9523-9528. (The VITACOG trial used folic acid, B6 and B12 at higher doses in older adults with mild cognitive impairment.)

  4. Lamers Y, et al. Red blood cell folate concentrations increase more after supplementation with [6S]-5-methyltetrahydrofolate than with folic acid in women of childbearing age. Am J Clin Nutr 2006;84(1):156-161. See also the EFSA opinion on calcium-L-methylfolate bioavailability.

  5. Homocysteine Lowering Trialists' Collaboration. Dose-dependent effects of folic acid on blood concentrations of homocysteine: a meta-analysis of randomized trials. Am J Clin Nutr 2005;82(4):806-812.

  6. Shoba G, et al. Influence of piperine on the pharmacokinetics of curcumin in animals and human volunteers. Planta Medica 1998;64(4):353-356. (Human arm n=8; the ~2,000% figure is specific to curcumin and has not been widely replicated.)

  7. Loew D. Pharmacokinetics of thiamine derivatives, especially of benfotiamine. Int J Clin Pharmacol Ther 1996;34(2):47-50.

  8. Wilson CP, McNulty H, Ward M, et al. Blood pressure in treated hypertensive individuals with the MTHFR 677TT genotype is responsive to intervention with riboflavin. Hypertension 2013;61(6):1302-1308. (University of Ulster research on riboflavin's link to the MTHFR and folate pathway.)

  9. EFSA Panel opinion on the substantiation of health claims related to niacin (EFSA Journal 2010;8(10):1757), and reviews of niacin and NAD+ in energy metabolism.

  10. Patel DP, Swink SM, Castelo-Soccio L. A review of the use of biotin for hair loss. Skin Appendage Disorders 2017;3(3):166-169. (Evidence for a benefit in well-nourished people is limited; the authorised claim covers the maintenance of normal hair and skin.) See also the EFSA biotin opinion.

This page is for general information about the ingredients in Methylated B Complex Ultra and is not medical advice. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle, and are not intended to diagnose, treat, cure or prevent any disease. If you are pregnant, breastfeeding, taking medication or under medical care, speak to a healthcare professional before use. Do not exceed the recommended daily intake.