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Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium, and phosphorus is important for building and keeping strong bones.
Vitamin D3 can also be obtained by consuming animal products. It is also interesting to note that since it is produced in the body, vitamin D is actually considered a hormone and not really a vitamin! Vitamin D is very important as it regulates the production of phosphorous and calcium in the body.