The MTHFR gene is extremely common and can lead to a problem processing the B Vitamins, making people particularly susceptible to deficiency of B12, folic acid, and
Vitamin B6. Ironically, in these cases,
Vitamin B6 Levels and
Vitamin B12 Levels will be HIGH, despite actually being a DEFICIENCY of these vitamins. This is because the vitamins build up in the bloodstream, where they are measured, but the vitamins can't get into the cells where they are needed.