Alternating tretinoin and GHK Cu (copper peptides) nightly maximizes anti aging benefits while minimizing irritation. , Both are potent but DIFFERENT actives. Tretinoin speeds up cell turnover and Can Copper Peptides Be Used with Tretinoin? Guide Neurogan Health EllieMD Skincare Refine PM (GHK Cu Tretinoin Dexpanthenol Vitamin E Hyaluronic Acid )
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