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doi: 10.1371/journal.pntd.0007962 61 Cunha-NetoEChevillardC

Glutathione can also improve your cognitive abilities, boost focus, increase concentration, help you sleep more peacefully

Benefits: Retinol-like benefits without irritation Better tolerated by sensitive skin Can use during day (not photosensitizing) Gentle but effective Considerations: Slower results than tretinoin Less research than retinoids More expensive than retinol Who it's for: Sensitive skin, pregnant/breastfeeding women (seeking retinoid alternative), anyone who doesn't tolerate retinoids For comprehensive information on copper peptides when they do work, see our GHK-Cu copper peptides guide

No Visible Results After 8 Weeks Cause: Inconsistent application, low GHK-Cu concentration, or unrealistic expectations for your skin type

GHK (glycyl-l-histidyl-l-lysine) occurs naturally in the human body and readily binds with copper (CU) to form GHK-CU, a peptide complex with broad biological activity