Originally Posted by zanpar321

It's the SNP location rs1801133. The 1298 mutation also needs to be checked rs1801131.

See mine below

Gene

MTHFR C677T rs1801133 AG +/- (if you have two +'s then you metabolize at 30%)
MTHFR 1298 rs1801131 TT -/- (so I don't have this mutation).

You can get a free analysis of 23andme data at geneticgenie.org. Another great resource is

http://mthfr.net/

I hope this helps.