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Many people ask whether a copper peptide can tighten skin, but current evidence suggests topical GHK-Cu mainly improves hydration, texture, and skin quality rather than physically shrinking excess skin

Mild side effects noted in clinical trials have included bloating or mild cramps, gas and/ or loose stools, potential weight gain, and flushed skin

"The human tri-peptide GHK and tissue remodeling." Journal of Biomaterials Science, Polymer Edition

For comprehensive anti-aging benefits, GHK-Cu remains better documented

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