AAACa AdvaCAL Calcium - developed by Dr. Takuo Fujita, MD and colleagues - consists of a type of patented oyster shell supplement that is made by heating calcium to about 800°C in a vacuum, which breaks calcium carbonate up into calcium oxide and calcium hydroxide. AACa is then combined with a heated algal ingredient Cystophyllum Fusiforme to form AAACa, which results in better calcium absorption without the need for Vitamin D... Full Text