NOW Foods Magnesium & Calcium provides a balanced 1:1 ratio of elemental magnesium and calcium — supporting the essential interplay between these two minerals that are required in tandem for proper bone mineralization, muscle function, and cardiovascular health. While calcium is critical for bone density and muscle contraction, magnesium is equally important for calcium metabolism, activating the enzymes needed to incorporate calcium into bone, and preventing calcium from depositing in soft tissues. Supplementing calcium without magnesium can disrupt this balance — which is why NOW Foods includes both in meaningful amounts in every tablet. This synergistic formula provides foundational support for bone health, muscle relaxation, nerve function, and heart rhythm. Manufactured in NOW's GMP-certified facility with batch potency testing.