![]() Since vitamin D can be synthesized in adequate amounts by most mammals exposed to sufficient sunlight, vitamin D acts as a hormone that acts on vitamin D receptors to regulate calcium in opposition to parathyroid hormone. These compounds need to undergo hydroxylation in order to be biologically active in the body. There are 2 main forms of vitamin D vitamin D3 (also known as cholecalciferol) and vitamin D2 (ergocalciferol). ![]() Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and multiple other biological effects. Calcium carbonate may also be used as a nutritional supplement or to treat hypocalcemia. An increase in bicarbonate ions and prostaglandins may also confer cytoprotective effects. Subsequent increases in pH may inhibit the action of pepsin. ![]() ![]() It is a basic compound that acts by neutralizing hydrochloric acid in gastric secretions. Calcium carbonate is an inorganic salt used as an antacid. ![]()
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