IGF 1 promotes the development and cytotoxic activity of human NK cells Nature Communications GHK CU Peptide for Skin Rejuvenation Wittmer Rejuvenation Clinic Growth Hormone and IGF 1 Actions in the Brain and Neuropsychiatric Diseases Physiology American Physiological Society Synergy of GHKCu and hyaluronic acid on collagen IV upregulation via fibroblast and exvivo skin tests Jiang 2023 Journal of Cosmetic Dermatology Wiley Online Library
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