Cal-Mag Citrate Effervescent Powder helps maintain normal bone and muscle health.* An analysis of a large number of previously conducted research studies on calcium and bone mass showed that daily supplementation of 500-1,500 mg of a well-absorbed form of calcium supports bone mass in adolescents, young adults, older men, and postmenopausal women.* In addition to playing an essential role in maintaining normal bone density, magnesium is essential for normal cardiac rhythmicity, normal pulmonary function, and healthy blood glucose regulation.*The addition of vitamin C also supports immune function and connective tissue.* Per scoop, Cal-Mag Citrate Effervescent Powder provides 500 mg each of calcium and vitamin C, and 200 mg of magnesium. The effervescence created by adding the powder to water enhances the absorption of the citrate-mineral chelates.* Thorne's Cal-Mag Citrate Effervescent Powder is NSF Certified for Sport®. *