Coral calcium

Tier 3 — weak evidence · Bone · Alkaline claims

Calcium from fossilised coral, marketed as superior and capable of alkalising the body. FTC and FDA took action against marketers for false cancer cure claims. No better absorbed than regular calcium carbonate. May contain trace minerals but also carries a risk of lead contamination. Cheaper, tested calcium sources are preferable.

Dose: 500–1,000 mg/day as calcium; no better than standard calcium carbonate; contamination risk