Vitamins are vital substances which the body cannot produce on its own and which must therefore be constantly supplied through healthy and varied nutrition. Different vitamins have specific functions in the body. For example, they influence the conversion of food into energy, the building of body cells, supporting the immune system, the formation of hormones, the detoxification of the body and the support of enzymes. The vitamins E, D, K and A are fat-soluble vitamins. All other vitamins are water-soluble. Common sources of these vitamins include oranges, green leafy vegetables, carrots, apples, and salmon.
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