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Using them in sequence (lighter AHK-Cu spray first, followed by GHK-Curich creams or serums) allows each peptide to optimize a different aspect of skin biology

Fehm HL, Smolnik R, Kern W, McGregor GP, Bickel U, Born J

Nat Methods 9:671675 Schrder CU, Lee L, Rey M, Sarpe V, Man P, Sharma S, Zabrouskov V, Larsen B, Schriemer DC (2017) Neprosin, a selective prolyl endoprotease for bottom-up proteomics and histone mapping

This absorption difference explains why many athletes bypass the supplement aisle entirely

Well, no wonder then

two contained the declared API, while two were incorrectly labeled, and the declared API was absent