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Beyond wound repair, this review also discusses comparative physicochemical properties and wound healing applications of tripeptides versus larger peptides, factors influencing their performance, strategies for combination with biomaterial scaffolds, and emerging applications in fields such as cancer and cosmetics

(503A vs 503B, and what that means in practice) What is the source and testing standard

The widely repeated claim that Dihexa is "seven orders of magnitude more potent than BDNF" originates from that flagged McCoy paper and reflects an assay-specific in-vitro spine-density measurement picomolar Dihexa versus nanomolar BDNF in one assay not a millions-fold advantage in a living brain