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Proc Natl Acad Sci U S A [Internet]

It promotes collagen production, maintains the skins elasticity, and protects it from environmental pollutants, keeping the skin soft, smooth, and healthy

In fact, people often mention them both in one breath, as in: "NAC is a precursor to glutathione." (A precursor is a compound that is used to form another compound, generally through metabolic reactions inside the body.) So which one, if either, is better to take as a supplement

Peptides are short chains of amino acids that act as signaling molecules in the body, regulating everything from muscle growth to fat metabolism and cellular repair