NOW Foods Magnesium Glycinate – 180 tabs. Highly Absorbable Form Supports Healthy Muscle, Nerve & Heart Functions* Magnesium glycinate utilizes magnesium bound to the amino acid glycine, which facilitates intestinal absorption.* 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 processes that require magnesium are fat and protein production, as well as glucose metabolism.* Magnesium status is also important for regulation of calcium balance through its effects on the parathyroid gland.*.