MTHFR mutation, Other Gene SNPs, Uncategorized B12, MTR, and MTRR gene SNPs. B12 matters a lot for everyone. We’ve spoken about it before in terms of the best B12 for MTHFR mutants, and in general the link between B12 and MTHFR in season 2, episode 27. You absolutely need B12 if you… Share with friends:Amy NeuzilAugust 7, 2022