Calcium hydroxyapatite (MCHC)

Tier 3 — weak evidence · Bone · Osteoporosis · Mineral complex

Microcrystalline hydroxyapatite concentrate derived from bovine bone that provides calcium in the same form found in human bones, along with phosphorus, collagen, and growth factors. Several trials show it preserves bone density better than calcium carbonate alone. More expensive than standard calcium supplements. Not suitable for vegetarians or people with bovine product concerns.

Dose: 1,000 mg/day MCHC (providing ~250 mg calcium); pair with vitamin D3 and K2