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"If someone experiences benefits or side effects, we don't know if they're from the peptide or because of impurities, endotoxins, or anything else that could be in there," Husain says

Nobody can give you an honest probability of harm because the studies that would generate one have not been done

Expert Featured In This Story Stuart Phillips Professor Extraordinary claims that peptides can boost injury recovery, build muscle, and fight aging have helped these compounds explode in popularity but what exactly are peptides and what does the evidence say about these claims

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