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The naming convention reflects the mechanistic story rather than any cosmetic marketing claim: GHK-Cu and TB-500 are widely cited in dermal and connective-tissue repair literature, while BPC-157 brings vascular and gastrointestinal models to the same vial

"Research-grade peptides are going to have junk in them," said Paul Knoepfler, a cellular biologist at the University of California Davis

The human evidence is limited, but the mechanistic rationale is enough that this remains an active research area

Understanding bioavailability explains why injectable doses are measured in milligrams while topical concentrations use percentages