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Both these methylation reactions are vital for growth and cell reproduction.910 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

Infect Immun 62(7):27152721 Callegan MC et al (1999) Pathogenesis of gram-positive bacterial endophthalmitis

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However, if you happen to be choosing between the two, GHK-Cu is usually the better option since it helps the body use copper in a way that supports healthy skin, even being compared to Matrixyl Does GHK Combine with Copper Ions Naturally