does ghk cu serum need to be refrigerated Why You Shouldn't Mix GHK-Cu with AHA, BHA, or Retinol If you're using a -Cu (Copper Peptide) in your skincare routine, layering it with strong actives like AHA, BHA, or retinol may 1 to relieve the appearance of redness and work to restore and strengthen your skin barrier Hyaluronic Acid 2% + GHK-Cu
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