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Some peptides are well-established and FDA-approved: Insulin : Used to manage diabetes since the 1920s

Supports skin health and appearance Promotes hair wellness Healthy aging support About GHK-CU GHK-Cu is a naturally occurring copper peptide found in the human body that has been studied for its potential role in supporting skin health, hair wellness, and healthy aging

Spilanthol (Acmella oleracea) 1% What it does: This botanical extract is marketed as a facial muscle relaxant to soften dynamic wrinkles by mildly relaxing muscles or smoothing skin