From the Manufacturers Label: Jarrow Formulas SAM-e 400 provides a full 400 mg SAM-e (net yield) from 800 mg of SAM-e tosylate disulfate. SAM-e 400 is manufactured under low temperature and low humidity and is enteric-coated to ensure a biologically active product. Found in all living cells, SAM-e is a metabolite of methionine (an essential amino acid) SAM-e is a chiral molecule and consists of two forms: (S,S) SAM-e and (R,S) SAM-e. The biologically active form is the (S,S) structure, while the (R,S) structure is biologically inactive. Jarrow Formulas SAM-e is made naturally by microbiological fermentation and then specially processed without solvents to preserve 68-80% (S,S) SAM-e, the highest active level available. Promotes: - Longevity - Joint Strength - Liver Detoxification - Mood and Brain Function Manufactured by Jarrow Formula.