What is advanced calcium AdvaCALAdvaCAL AAACa is natural calcium hydroxide and calcium oxide with HAI, a patented amino acid extract from Japanese sea algae. AdvaCAL is the #1 bone building calcium, clinically proven to build strong, healthy bones. AdvaCAL capsules/caplets are well tolerated in the stomach, safe, small, and easy to swallow.AdvaCAL is also available in a complete bone health formula called AdvaCAL Ultra with magnesium, vitamins D and C, copper, boron, silica, zinc, and manganese. World-famous AdvaCAL researcher reports... AdvaCAL Users Have Fewer Fractures! Clinically proven to fight Osteoporosis Safe, small, easy-to-swallow AdvaCAL capsules Only AdvaCAL advanced calcium blends natural calcium hydroxide and calcium oxide with a patented amino acid extract from Japanese sea algae to build stronger, healthy bones.