Zenith Nutrition Vitamin-D3 is vital for calcium absorption and the maintenance of healthy bones and teeth. Supports cellular health and proper nervous system and immune function. Vitamin D3, also known as cholecalciferol, is a form of vitamin D that the body manufactures when skin is exposed to UV radiation from the sun. It's converted from food sources and sunlight into its active form, calcitriol, by the liver and kidneys.
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