Sulfur is a nonmetallic element usually found as part of larger compounds. It is necessary for the formation of collagen, the protein found in connective tissue in the body, and present in keratin, which is essential for the maintenance of skin, hair, and nails. Sulfur helps regulate carbohydrate metabolism, aids in digestion, and is important to cellular respiration, among other important functions.

Foods that are rich in protein, such as animal meats, are typically good sources of sulfur. The diet does not usually need to be supplemented with sulfur, though vegans are at risk for a deficiency.

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