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Peptides are short chains of amino acids linked together by peptide bonds, with polypeptides being longer chains. They are the building blocks of proteins, but smaller than proteins, typically consisting of between 2 and 50 amino acids. Peptides can stimulate the skin to produce collagen, leading to firmer, younger-looking skin. Peptides can be found in certain foods, such as eggs, milk, and meat proteins. Peptide supplements are generally safe for healthy individuals.