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Dietary SupplementSuperior Bioavailable ChelateSuitable for Vegetarians and HypoallergenicMagnesium is one of the most important minerals in the body but an estimated 75% of Americans are magnesium deficient. Magnesium plays a key role in over 300 enzymatic reactions including supporting cardio vascular bone muscle energy and neurotransmitter processes. Source Naturals magnesium is attached ("chelated") to the amino acid glycine. The magnesium bis-glycinate combination enables efficient absorption the glycinate allowing the magnesium to transfer easily across the intestinal wall. Increased absorption means more usable magnesium for your body's needs.