Vincos OsteoSheath®4 contains bioavailable minerals and cofactors including Microcrystalline Hydroxyapatite (MCHC), Calcium Citrate, and Calcium Amino Acid Chelate. The MCHC in OsteoSheath®4 is from New Zealand. Each serving (4 Tablets) contains 1,221 mg of Elemental Calcium. The pH-Sensitive coating is designed for intestinal absorption for maximum ingredient utilization. Supplement Facts Serving Size: 4 Tablets Servings per Container: 30