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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 is important for maintaining calcium balance in your body and this is very important as it is crucial for the normal functioning of the nervous system, and also for bone density, tendons and ligaments and powerful contractions when working out in the gym.