Methylation helps the body rid itself of toxins. It assures that the new cells you make every day are exact copies of the ones that are being replaced. Methylation also converts water-soluble vitamins into the proper fat-soluble form so that proper nutrition can be delivered to the nervous and immune systems.
MTHFR is needed for DNA reproduction and is essential for folate (folic acid or Vitamin B-9) metabolism. If an MTHFR mutation is present, a person may become deficient in 5 methylenetetrahydrofolate (5-MTHF). A deficiency in 5-MTHF is significant as you will see.