Most vitamins assist other molecules to facilitate key chemical reactions inside our bodies. For example, vitamin C assists at least eight enzymes, including three that are necessary for the synthesis of collagen. Even though we have these enzymes, they cannot make collagen without vitamin C. When the enzymes can’t work, we get sick. Vitamin C is called essential not because it is important but because we must get it from our diets. All vitamins are important, crucial even, to human health, but those that are essential are the ones that we cannot make ourselves and therefore must ingest. In
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