Potent, economical calcium citrate with vitamin D formula for bone nourishment Loaded with 200 IU of vitamin D to enhance absorption Features 315 mg of calcium in each tablet Calcium Citrate & Vitamin D from Swanson Health Products offers economical bone nourishment in one convenient formula. Recommended by doctors and nutritionists for promoting strong bones, this special formula combines an easy-to-assimilate form of calcium with a generous supply of vitamin D to promote absorption even further. Each tablet supplies 315 mg of calcium and 200 IU of vitamin D.