P. Why can't I just increase absorption by increasing the dosage of inorganic calcium?
You could. But as a result there would be more inorganic minerals precipitated in the stomach and small intestine, and the excess amount of magma precipitation would promote G.I. tract distress (diarrhea or constipation). The precipitate can also absorb crucial vitamins as it is excreted, thus robbing the body of essential vitamin. Therefore, increasing the amount of common inorganic calcium supplements would actually be counterproductive.