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Vitamin D3, also known as cholecalciferol, is a fat-soluble vitamin that plays a crucial role in many aspects of health, including: Bone health Vitamin D3 helps the body absorb calcium and phosphorus, which are essential for building and maintaining strong bones. A deficiency in vitamin D can lead to conditions like rickets and osteomalacia, which cause bones to become soft and break more easily. Immune system Vitamin D3 helps regulate the immune system's response to pathogens and other invaders. Mental health Low levels of vitamin D are linked to increased symptoms of depression and anxiety. Muscle function Vitamin D3 deficiency can cause muscle weakness, pain, and twitches. Cardiovascular health Vitamin D3 helps prevent calcium imbalances, which are important for cardiovascular health. Metabolic health Vitamin D supplements may help improve glucose homeostasis and insulin sensitivity. Skin health Vitamin D3 helps brighten skin and prevent or relieve inflammatory skin conditions.During the autumn and winter, it's difficult to get enough vitamin D from the sun alone, so some people take a daily supplement.