Calcium Works In Harmony With Other Minerals And Vitamins To Maintain Strong, Healthy Bones And Teeth. Magnesium Is Used To Build The Mineralized Structure Of Strong Bones, Supports Normal Muscle Function, And Helps Metabolize Food Into Energy. Zinc Is Needed To Make The Proteins And Collagen That Keep Your Skin, Tissues, And Immune System Healthy. This Supplement Contains A 2:1 Ratio Of Calcium And Magnesium, Plus Zinc, In An Absorbable Chelated Form – A Great Option For People With Low Stomach Acid.