Methyl Folate 400mcg by Jarrow Formulas

This is an everyday-strength folate for adults who want the active form: people whose RBC Folate runs low or low-normal, whose Homocysteine is higher than they would like, or whose MTHFR Genotype shows a variant that slows the conversion of folic acid. It also suits people who eat few leafy greens and legumes or who drink alcohol regularly. If your folate and Homocysteine are already in range on a good diet, you may not need it.

Folate from food and folic acid from fortified grains both have to be converted, in several steps, to 5-methyltetrahydrofolate (5-MTHF) before the body can use them. This capsule supplies 5-MTHF directly, as the (6S) glucosamine salt, so the last conversion step is skipped. In that form, folate donates the methyl group that recycles homocysteine back to methionine, a reaction that also needs vitamin B12, and it supplies building blocks for DNA and for new red blood cells.

Each capsule provides 680 mcg DFE of folate, which is 400 mcg of (6S)-5-MTHF. The label directs adults to take 1 capsule once a day, with or without food, or as a qualified healthcare professional directs. It pairs naturally with vitamin B12. If Homocysteine is the reason you are taking it, your B12 and B6 status matter as much as folate does.

Know your Vitamin B12 level before taking folate long term. Folate can correct the anemia of B12 deficiency while nerve damage continues unnoticed, so a low or borderline Vitamin B12, or a raised Methylmalonic Acid, should be dealt with first. The label says to consult a healthcare professional if you take medication, especially antiepileptic medicines and chemotherapy: folate can interfere with phenytoin and with methotrexate. It says the same if you are pregnant, nursing, under 18 or have a medical condition. In pregnancy, public health guidance is written around folic acid, so ask which folate to take.

RBC Folate reflects the past few months, so recheck it, along with Homocysteine, after 8–12 weeks. Homocysteine often moves sooner, within 4–6 weeks. Most people feel nothing either way, which is expected. Compared with folic acid, methylfolate costs more and has a shorter research record, but it does not depend on the conversion step and leaves no unmetabolized folic acid in the blood. At this strength, side effects are uncommon.