It has been suggested that folic acid will interfere with methylfolate, especially at the blood brain barrier. But I haven't seen proof yet of that conclusively.

Those in the US will find it difficult to get rid of all folic acid from the food fortification program.

Heterzygous means you have some methylation going on, but perhaps not enough for a full life.

I am not an expert on this methylation stuff. Have you been to
MTHFR.net yet? That site is pretty complete and you can study it at your leisure.

Check your other SNPs listed too. Janieg here just found out in her genetic list that she has a mutation involving biotinidase, which recycles biotin. So she needs high dose biotin to make up for this lack.

As time passes here, we are seeing more and more posters showing up with mutations in their DNA which contribute to PN and many other medical problems.

It is a good thing you had the testing.