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Vitamin D3 is also known as Cholecalciferol. It is a fat-soluble vitamin that helps in the absorption of calcium and phosphate. It is the only vitamin that is produced in our body with the help of sunlight. Cholecalciferol is very essential for the proper function of our body. It plays a very important role in the immune system, strengthening bones and muscles, heart function, and brain function. Vitamin D3 deficiency may affect our kidneys, joints, and weaken bones and muscles.