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AdvaCAL provides 100% of the Recommended Daily Value (% DV) of calcium, is easy to take and easy on the stomach. AdvaCAL is naturally alkaline like magnesium. Additional magnesium intake is not required with AdvaCAL for a bone benefit.

References:

1. Label and pill size comparisons derived from each brand (Nov 2009) All trademarks are the property of their respective owners.
2. Based on relative solubility of various calcium forms. Highly soluble calciums generally need less  stomach acid from food intake to be bioavailable. We recommend that AdvaCAL be taken with food. 
Fujita T, Makaaki F, et al "Intestinal Absorption of oyster shell electrolysate" J Bone Min Res. 1988 Nov 5; 3: 321-326.
3. Recker, RR "Calcium Absorption and Achlorhydria" N Engl J Med 1985 Jul 11; 313(2) 70-3
4. Heaney R, Recker RR, Weaver C "Absorbability of Calcium Sources: The Limited Role of Solubility" Calcif Tissue Intl 1990 46:300-304
5. Brennan M, Duncan W,Wartofsky L,. Butler V, Wray "InVitro Dissolution of Calcium Carbonate Preparations" Calcif Tissue Int'l (1991) 49:308-312
6. Calcium Carbonate from algae has no study available showing benefit from calcium alone. Click to Review.

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