Description_x000D_ Application_x000D_ L-Methionine has been used in chloramine assay and malonaldehyde assay. It has also been used as a standard in methionine assay._x000D_ Packaging_x000D_ 1 kg in poly bottle_x000D_ 5, 25, 100, 500 g in poly bottle_x000D_ Biochem/physiol Actions_x000D_ L-Methionine serves as precursor for transmethylation and transsulphuration. Methionine adenosylation results in the formation of S-adenosyl-L-methionine (SAM). SAM serves as a methyl donor to a number of substances. This methylation is significantly associated with the immune system functioning. Thus, SAM deficiency causes severe combined immunodeficiencies. L-Methionine’s metabolic product, glutathione, is known to regulate immune response and has antiviral action.