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But B12 is involved in complex body wide set of interactions
They should never be used as an alternative to therapies and medication
Methionine, a sulfur-containing, essential amino acid, is a precursor of S-adenosylmethionine, a cofactor for one-carbon metabolism and the final methyl donor for the methylation of DNA, RNA, proteins, and phospholipids.The methionine synthase plays a paramount role in the synthesis of nitrogenous bases (purines and pyrimidines) involved in the formation of DNA
You are paying for a completely different regulatory framework
A standard multivitamin may be all that is needed to correct a mild vitamin B12 deficiency
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