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A comparative study of the efficacy of 4% hydroquinone vs 0.75% Kojic acid cream in the treatment of facial melasma

Secretagogues stimulate endogenous production and may preserve natural regulation, but all therapies require medical oversight

doi:10.1001/archotol.1993.01880180068013

GHK Peptide as a Natural Modulator of Multiple Cellular Functions (Pickart et al., 2015) This paper reviews clinical research showing that topical GHK-Cu can tighten skin, improve elasticity, reduce fine lines and wrinkles, and enhance skin clarity and density

Production declines with age and with the demands of chronic high-output training