Kirkland Signature Calcium Citrate, Magnesium, and Zinc supplement tablets.Each bottle contains 500 tablets designed to support bone health and may reduce the risk of osteoporosis.The formulation includes 500 mg of Calcium Citrate, 80 mg of Magnesium, 10 mg of Zinc, and 20 mcg of Vitamin D3 per serving.It is USP verified for quality and purity