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Bruising at the injection site

Finally, GHK-Cu should be distinguished from cosmetic small molecules and other cosmetic peptides retinoids, glycolic acid, palmitoyl peptides, acetyl peptides, and various other cosmetic-ingredient classes

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Van Gaal, L., Pi-Sunyer, X., Despres, J

Dihexa (PNB-0408, Hexanoyl-Tyr-Ile-Ahx-NH2) is an oligopeptide drug, orally active and blood-brain barrier-permeable angiotensin IV analog, binds to hepatocyte growth factor (HGF) with high affinity (Kd=65 pM) and potentiates its activity at its receptor c-Met