← The FormularyLong gameFolate
Also known as Folic acid / L-5-MTHF / vitamin B9It fixes the blood test. It does not fix the nerve.
Folate's caution is the most important thing about it, and it is subtle enough that it gets skipped. A B12 deficiency shows up early on a routine blood count as enlarged red cells. Folic acid corrects that blood picture — and does nothing at all for the nerve damage B12 deficiency is quietly causing. So the anaemia disappears, the test comes back normal, and the neurological damage, which can become permanent, keeps going unnoticed. That is the entire reason the upper limit for folic acid exists. Our products carry 400 mcg, the requirement, which is the right amount and not a reason to add more.
A water-soluble B vitamin. 'Folate' is the natural form in leafy greens and pulses; 'folic acid' is the synthetic form used in fortification; L-5-MTHF is the pre-activated form.
Folate donates single carbon atoms — the small pieces the body needs to assemble DNA bases and to convert homocysteine back into methionine. That second reaction needs B12 as well, which is why the two vitamins fail together and why one can hide the other's absence.
Builds and repairs DNA, makes red blood cells, and works alongside B12 in the methylation cycle.
Everyone needs it. It matters most for anyone who might conceive, where adequate folate before conception prevents neural tube defects — one of the best-established findings in nutrition.
Daily with food. L-5-MTHF is the active form and bypasses the conversion step some people convert slowly; ordinary folic acid works for most.
Nothing perceptible at nutritional amounts. This is a nutrient doing structural work, not producing sensations.
Grade A. The tolerable upper limit of 1,000 mcg/day for supplemental folic acid exists specifically to avoid masking B12 deficiency, not because of folate toxicity. Naturally occurring folate from food does not carry that limit.
Read the labelDo not take more than 1,000 mcg of supplemental folic acid a day. High folate can hide a vitamin B12 deficiency while nerve damage continues — if you are at risk of low B12, test both. Speak to a doctor first if you take methotrexate or anti-seizure medication.
Evidence grades describe how well an ingredient is studied — A well-supported, C emerging — not a promise of results. Educational, not medical advice. Doses are typical ranges; follow the label on the product.