Hi methylation experts Does anyone have an idea as to what would cause my MMA, homocysteine, and GGT to be under the expected lab range? My doctor said he has only seen these results a few times out of thousands of tests he has run on patients, and is unsure if the results are likely to mean something is blocked upstream on the citric acid cycle or something is draining them downstream. He doesn't think the results could be due to supplementation. My results are as follows: Homocysteine 3.6 umol/L (range: 4.2-13.4) MMA = 75 GGT= 8 U/L (range: 10-66) B12 >1500 pg/mL In case it helps, I am taking methylated vitamins but not high dose. I am not doing B12 shots or sublinguals but methyl B-12 is in my multivitamin. I am homozygous for the C677T mutation. Thanks!