Magnesium is a mineral that is critical for energy production and metabolism, muscle contraction, nerve impulse transmission, and bone mineralization. It is a required cofactor for an estimated 300 enzymes. Among the reactions catalyzed by these enzymes are fatty acid synthesis, protein synthesis, and glucose metabolism. Magnesium status is also important for regulation of calcium balance through its effects on the parathyroid gland. NOW® Magnesium Citrate Powder is a highly bioavailable form of Magnesium and contains no excipients or fillers. Powder format allows for controlled dosing.Each level teaspoon (3 g) contains:Magnesium (from Magnesium Citrate) 435 mgNon-Medicinal Ingredients: None Adult Dosage: Take 1 level teaspoon daily mixed into at least 240mL (1 cup) of water, with meals. This product must be diluted into clear liquid before ingestion.