.
But they do have some FAQs and protocol suggestions for different genetic combinations that can be helpful.I found I have some methylation issues where their recommendations are borne out by my experience: methyl-B12 makes me so sleepy I needed three naps a day. Returned to normal when I switched to hydroxy-B12. I can tolerate the amount of methylfolate I need, but not with added methyl-B12.
http://health.groups...HFRdiscussions/
One thing I wonder about: unmetabolized folic acid is carcinogenic, and those with the MTHFR polymorphism, especially the 10% or so who are homozygous, will have a lot of folic acid from fortified foods -- all cereals, bread, flour.
The FDA requires folic acid fortification as it prevents spina bifida in pregnancy, but maybe they should change the form they require.
Even those who are heterozygous like prophets and 40% of the population, likely still have an excess of cancer-causing unmetabolized folic acid. (heterozygous -> 60% efficiency, homozygous 30% efficiency at conversion compared to the wild-type SNP.)