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The small human studies should be treated as signal-generating, not definitive

GHK-Cu has been compared to other skincare products, such as retinol and vitamin C creams, and has shown positive effects, with some people anecdotally reporting improvements in their skin, such as reduced crow's feet, although a study on hair did not seem too promising 7m10s

Biochemical and Biophysical Research Communications

Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society

10.1111/j.1432-1033.1984.tb08363.x 109 LamblinG.RahmouneH.WieruszeskiJ