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Methylation is a fundamental biochemical process involved in detoxification, hormone metabolism, neurotransmitter production, DNA repair, and gene expression
So vitamin deficiencies are common
I recommend: at least 2,000 mcg (g) cyanocobalamin once each week, ideally as a chewable, sublingual, or liquid supplement taken on an empty stomach or at least 50 mcg daily of supplemental cyanocobalamin or a serving of B12-fortified foods three times a day, each containing at least 190 percent of the Daily Value listed on the nutrition facts label Those over 65 years of age should take at least 1,000 mcg (g) cyanocobalamin every day
After that, its given monthly
doi:10.1042/bse0340139
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