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1. Using cheap supplement forms like calcium carbonate: Cheap forms of supplements, like calcium carbonate, are often less bioavailable, meaning your body doesn’t absorb them as efficiently. Calcium carbonate, for instance, requires stomach acid to be properly absorbed, and many people, especially older adults, don’t produce enough stomach acid. This can lead to poor absorption and make the supplement less effective. Opting for better forms like calcium citrate can improve absorption and overall