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Vitamin D is one of the four fat-soluble vitamins (vitamin A, D, E, and K). Actually, it is not a true vitamin because it acts as a hormone and individuals with adequate sunlight exposure do not need vitamin D from diet. Vitamin D is essential for healthy bones and teeth. The main source of natural vitamin D is produced in the inner layer (dermis) of skin after sunlight exposure. Globally, there is an estimation that 1 billion people across all age groups and ethnicities have vitamin D deficiency. This is mostly due to people getting less sun exposure and/or using sunscreen because of climate, lifestyle, and concerns about skin cancer.