What is L-methylfolate (Deplin®)?

Deplin is the brand name for l-methylfolate. Do I mean folate? No, L-methylfolate is not dietary folate. Folic acid or folate is one of the B vitamins. It is metabolized in the body to L-methylfolate. So, is L-methylfolate a vitamin? Well, not exactly. It is designated by the FDA as a “medical food” even though…