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daily sunscreen required, usually applied at night Collagen Evidence GHK-Cu (copper peptide) Increased collagen in more subjects than vitamin C or retinoic acid in review data Retinol (retinoid) Well-documented collagen improvement in photoaged skin over months Route / Format GHK-Cu (copper peptide) Topical serum (OTC) or, at PeRx, prescription subcutaneous injection Retinol (retinoid) Topical cream or serum only Best For GHK-Cu (copper peptide) Sensitive skin, collagen and skin-quality support, gentle anti-aging Retinol (retinoid) People who tolerate a turnover agent and want a heavily studied option Read the table as two tools, not a winner and a loser
And that's because growth hormone and IGF-1 are somewhat indiscriminate in terms of the tissues that they promote the growth of
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Life Sci 76:11231134 Santofimia-Castao P, Clea Ruy D, Garcia-Sanchez L, Jimenez-Blasco D, Fernandez-Bermejo M, Bolaos JP, Salido GM, Gonzalez A (2015a) Melatonin induces the expression of Nrf2-regulated antioxidant enzymes via PKC and Ca2+ influx activation in mouse pancreatic acinar cells