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Both these methylation reactions are vital for growth and cell reproduction.[9][10] 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.[11] The methionine synthase plays a paramount role in the synthesis of nitrogenous bases (purines and pyrimidines) involved in the formation of DNA

The best way to get vitamin B12 is through your diet

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Providers default to D64.9 or D63.0, losing specificity and risk adjustment value

prepare fresh or store stocks under protective conditions