When you receive blood test results showing high folate levels, it might seem positive at first. However, it can signal a potential issue with MTHFR (methylenetetrahydrofolate reductase) function and highlight risks related to unmetabolized folic acid (UMFA) buildup in the bloodstream.

L-5MTHF is the active form of folate, but ironically, it is far less studied than the synthetic (inactive) form folic acid. Because of that, the safe upper limit of L-5MTHF is not known precisely, but we can draw some conclusions from existing data about the risks of high-dose folic acid.

Blood tests for folate have one big fatal flaw, making them both innaccurate and functionally useless, and the most common folate levels that we see on the blood tests of people with MTHFR might surprise you.

The idea that methyl folate could be a better option than folic acid in prenatal vitamins is controversial, because folic acid has been the fertility go-to treatment since it was discovered in the 1930s. The issue is, MTHFR had NOT been discovered in the 1930s, and the research hadn't really dived into the genetic needs of infertile couples yet.