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The short answer No peptide has been shown to extend human lifespan or slow human ageing. That is not a hedge but a description of where the evidence sits, and the question's structure explains why. A lifespan outcome takes a lifetime to measure. So every study in this field measures something else instead, a marker or a score or a rate, and asks you to accept the substitution. Almost all of the argument in longevity supplements happens inside that substitution, and it is almost never made expli …