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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

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In rats given BPC-157, serotonin levels in the brain increase in specific regions while simultaneously decreasing in other regions, such as the hippocampus.[ref] A 2020 study found that BPC-157 reduced leaky gut syndrome by stabilizing gut permeability after NSAID use.[ref] Reducing leaky gut theoretically can affect the gut-brain axis and reduce inflammation