Nutrition Biochemistry

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folic acid cycle

I'm having trouble finding a good description of the folic acid cycle. I'm wanting to know what forms of folic acid/folate are best to counter the effects of the two common MTHFR mutations. It seems clear that 5-MTHF (food source folate) is best for the 677 mutation. It's less intuitive to me that that would be the best source for the 1298 mutation (in order to maximize BH4 production), but that's the only advice I can find.

Can anyone find a clear explanation?