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Use retinol and copper peptides on alternating nights, or separate them by morning and evening application
The agency would need to issue a rule to add them to the 503A bulk compounding list, which could take a year or more
The Evidence Gap: Clinical Trials and What They Actually Show The evidence gap between GHK-Cu and retinoids is real, and any honest comparison of GHK-Cu vs retinol for anti-aging must address it plainly
Barrera et al., 2011
Some findings also point to better recovery when glutathione is applied directly to the skin
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