Cysteine is an amino acid needed by the body to make proteins, which perform numerous life-sustaining functions in the body. Cysteine occurs naturally in foods and is also manufactured in the body if sufficient methionine is available. The body uses cysteine to make another amino acid called glutathione, which has antioxidant properties that fight the cell-damaging effects of free radicals. Cysteine is also present in the chief protein in skin, nails, and hair, and promotes skin elasticity.
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