Folate vs Folic Acid vs Methylfolate: What Is the Difference?

Folate is the natural form of vitamin B9 found in food, and the umbrella name for the whole vitamin. Folic acid is a synthetic form of folate used in supplements and fortified foods, which the body converts into methylfolate. Methylfolate (L-5-MTHF) is the active form that circulates in your blood, so it needs no conversion at all.

All three count as vitamin B9, which is why the words get used as if they mean the same thing. They do not, quite. The word on the label tells you which form is inside and how many steps your body takes to turn it into the form it uses. Here is the plain-English difference, a side-by-side table, and how to read a UK label so you know exactly what you are buying.

Is folate the same as folic acid?

Not exactly. Folate is the family name. In food it comes as a mix of natural folates, found in broccoli, Brussels sprouts, leafy greens, peas, chickpeas and kidney beans¹. Most of the folate in a normal diet is already in the methylfolate form⁵.

Folic acid is the man-made version¹. It is not found naturally in food; it appears only in fortified foods, supplements and medicines⁵. Because it is stable and keeps well, it is the form most fortified foods and many supplements have used for decades. When the NHS and the Food Standards Agency talk about "folate, including folic acid", they mean the vitamin as a whole, whichever form it arrives in³.

The NHS says adults need 200 micrograms of folate a day, and that most people can get this from a varied diet¹.

Folic acid is well studied, and it has a clear place

It is worth saying plainly: folic acid is not a lesser or unsafe form. It is the form behind most of the folate research, and it is the form the UK relies on for public health.

• Pregnancy: the NHS advises taking 400 micrograms of folic acid every day when trying to get pregnant (ideally 3 months before) and for the first 12 weeks of pregnancy, with a higher dose for some people that a GP can prescribe. The full guidance is on the NHS pregnancy vitamins and supplements page².
• Fortification: many UK breakfast cereals are already voluntarily fortified with folic acid, and non-wholemeal wheat flour will be fortified with folic acid by law from December 2026³.

So the real difference between folic acid and methylfolate is not "good" against "bad". It is the route each one takes.

What is methylfolate (L-5-MTHF)?

Methylfolate is short for L-5-methyltetrahydrofolate, often written L-5-MTHF or 5-MTHF. It is the main form of folate in food and the form normally found circulating in your blood, which is the folate your tissues take up and use⁵. On its own it is not very stable, so supplements use it as a salt: calcium L-methylfolate (sold under the ingredient name Metafolin) or a glucosamine salt (sold as Quatrefolic).

How does it compare with folic acid? A review of the clinical research found the two have comparable absorption and activity at equivalent doses, and that methylfolate is at least as effective at raising folate levels in the blood⁵. The practical difference is that methylfolate is already in its finished form.

How does the body turn folic acid into methylfolate?

Folic acid has no activity of its own as it comes. Inside your cells it is first reduced by an enzyme called dihydrofolate reductase (DHFR) into tetrahydrofolate, the working base form of folate⁵. From there it moves through the folate cycle, and the final step to methylfolate is carried out by another enzyme, MTHFR (methylenetetrahydrofolate reductase).

Think of it as a short assembly line. Folic acid joins at the start. Methylfolate is what comes off the end. Taking methylfolate simply means starting with the finished product rather than the raw part.

Where MTHFR comes in

The MTHFR gene has a common variant, usually written C677T. People who carry two copies (the 677TT genotype) have a less active version of that final-step enzyme, and EFSA takes this group's higher folate requirement into account when it sets reference intakes for the population⁴. Because methylfolate is already past the MTHFR step, its use does not depend on that enzyme⁶.

That is education, not a diagnosis. Carrying a variant is common and a genetic result on its own does not tell you how you will feel. If you have questions about MTHFR or your own folate levels, speak to your GP or pharmacist about your own health. We cover the two methylated forms in more depth in methylcobalamin and methylfolate: the two forms that matter most.

Folate vs folic acid vs methylfolate vs folinic acid: side by side

Folinic acid is the fourth name you may meet. It is another reduced form of folate (5-formyltetrahydrofolate), also used as a prescription medicine under the name calcium folinate. It skips the DHFR step that folic acid needs, but it still passes through MTHFR on its way to methylfolate.

How to tell which one is in your supplement

The quickest check takes about ten seconds, and it is all on the back of the pack.

• Read the ingredients list, not just the nutrition table. The nutrition table often just says "folate" or "folic acid" with an amount and a %NRV, whatever form is inside. The ingredients list names the actual compound.
• Look for the form words. "Folic acid" means folic acid. Any of the methylfolate names in the table above, including trade names such as Quatrefolic or Metafolin, means methylfolate. "Calcium folinate" means folinic acid.
• Check food as well as supplements. Fortified flour must list folic acid in the ingredients, and so must products made with it³, so you can see where folic acid is in your diet too.

If the label is long or the chemical names blur together, our free B vitamin label checker does the decoding for you: pick or paste the forms printed on your label and it tells you, in plain English, which are methylated or active.

So which form should you choose?

Both folic acid and methylfolate raise folate levels, and the research supports both. Folic acid is the well-studied form used in UK fortification and the one in the NHS pregnancy advice above. Methylfolate is already in the form found in your blood, so it skips the conversion steps, including the MTHFR step. Some people prefer it for exactly that reason. If you are pregnant, planning a pregnancy or taking medication, your GP, midwife or pharmacist can advise on your own situation.

Prime Vitality Methylated B Complex Ultra uses folate as L-5-MTHF, 667 µg per tablet, with methylcobalamin B12. You can see the full formula on the Methylated B Complex Ultra page, and if you are starting methylfolate for the first time, our guide to how long methylfolate takes to work sets realistic expectations.

Whichever form you choose, folate contributes to the reduction of tiredness and fatigue, and folate has a role in the process of cell division. Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle.

Frequently asked questions

Is folate the same as folic acid?

Not exactly. Folate is the natural form of vitamin B9 found in foods such as leafy greens, peas and beans, and the umbrella name for the vitamin. Folic acid is a synthetic form of folate used in supplements and fortified foods. Both count as vitamin B9, and the body converts folic acid into methylfolate.

What is the difference between methylfolate and folic acid?

Methylfolate (L-5-MTHF) is the active form of folate that circulates in the blood, so it needs no conversion. Folic acid is a synthetic form that the body converts into methylfolate in several steps. Research comparing the two at equivalent doses found both raise folate levels.

Is folic acid bad for you?

No. Folic acid is well studied, it is the form used to fortify foods in the UK, and it is the form the NHS advises before and in early pregnancy. It simply reaches the active form by a different route from methylfolate.

What does MTHFR have to do with folate?

MTHFR is the enzyme that makes the final step in turning folic acid into methylfolate. A common variant of the MTHFR gene makes that enzyme less active, while methylfolate is already past that step. This is general education, so speak to your GP or pharmacist about your own health.

How do I know which form of folate is in my supplement?

Read the ingredients list rather than the nutrition table. "Folic acid" means folic acid; calcium L-methylfolate, L-5-MTHF, Quatrefolic, Metafolin or levomefolate mean methylfolate; calcium folinate means folinic acid. Prime Vitality's free label checker can decode the forms on any label for you.

References

1. NHS. Vitamin B. nhs.uk/conditions/vitamins-and-minerals/vitamin-b
2. NHS. Vitamins and supplements in pregnancy. nhs.uk/pregnancy/keeping-well/pregnancy-vitamins-and-supplements
3. Food Standards Agency. Folic acid (guidance, updated July 2026). gov.uk/government/publications/folic-acid
4. EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific Opinion on Dietary Reference Values for folate. EFSA Journal 2014;12(11):3893. doi.org/10.2903/j.efsa.2014.3893
5. Pietrzik K, Bailey L, Shane B. Folic acid and L-5-methyltetrahydrofolate: comparison of clinical pharmacokinetics and pharmacodynamics. Clinical Pharmacokinetics 2010;49(8):535-548. PubMed 20608755
6. Scaglione F, Panzavolta G. Folate, folic acid and 5-methyltetrahydrofolate are not the same thing. Xenobiotica 2014;44(5):480-488. PubMed 24494987