Calcium Microcrystalline Hydroxyapatite, provided by Douglas Laboratories, supplies 500 mg of elemental calcium from 2,000 mg of microcrystalline hydroxyapatite(MCHC), a bioavailable source of calcium derived from whole bone. For 60 years, Douglas Laboratories has been dedicated to ensuring that the products we deliver are the highest quality available. Douglas Laboratories manufactures nutritional supplements for long-term health and active lifestyles.* Over the past 60 years, Douglas Laboratories has grown into a globally recognized leader in the development of science-based nutritional supplements. Vitamins, minerals and amino acids form the brick-and-mortar foundation of a healthy body. The 2015 Dietary Guidelines Advisory Committee reported that many Americans fall short in obtaining sufficient quantities of these important nutrients, including vitamins A, C, D and E, folate, calcium, magnesium, potassium, and fiber. Also, the prevalence of insufficient nutrient intake tends to increase with age. 35 to 40 percent of older adults who do not take supplements have inadequate B6 intake, and older adults often have difficulty obtaining enough B12 from their diet. Supplementation with vitamins, minerals and amino acids can play a valuable role in helping to fill these gaps.* *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Vitamin D (5,000 I.U.) Calcium Microcrystalline Hydroxyapatite Methyl B12 Plus B-Complex w/ Metafolin Methyl Folate 5 mg (5-MTHF) Ester-C Plus Add to Cart Add to Cart Add to Cart Buying Options Buying Options Buying Options Customer Reviews 4.7 out of 5 stars 1,132 4.3 out of 5 stars 80 4.7 out of 5 stars 303 4.7 out of 5 stars 554 3.8 out of 5 stars 11 4.5 out of 5 stars 27 Price $16.20$16.20 $22.60$22.60 $23.20$23.20 — no data — no data — no data BONE HEALTH* ✓ ✓ no data no data no data no data OVERALL HEALTH* no data no data ✓ ✓ ✓ ✓