Living with an MTHFR gene mutation can feel like stepping into a complex world of health advice and dietary rules. I get it - it’s overwhelming at first. But understanding what to eat and, just as importantly, what to avoid can make a huge difference in how you feel every day.

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.