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Strong Healthy Bones 3-in-1 Formula Dietary SupplementEssential Nutrition for Daily Bone Maintenance Combination Formula for Beneficial Calcium Utilization in The Body Science-Backed Quality Since 1969An outstanding source of essential nutrients for bone maintenance Swanson Calcium with Vitamins D & K provides quality nutrition at an affordable price. Designed to give your bones the nutrients they need to keep them healthy and strong Calcium with Vitamins D & K is a comprehensive formula combining three forms of calcium with the synergistic support of vitamins D and K. Each convenient capsule contains 350 mg of calcium from calcium hydroxide calcium carbonate and calcium citrate—plus 30 mcg of vitamin K and 3.3 mcg (133 IU) of vitamin D.