can i use ghk cu with retinol Why You Shouldn't Mix GHK-Cu AHA, BHA, or If you're using a -Cu (Copper Peptide) in your skincare routine, layering it with strong actives like AHA, BHA, or retinol may Skin Perfection 1% GHK-Cu Copper
Description
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Use With Caution in Cosmetic Applications Certain individuals may wish to exercise additional caution when introducing new cosmetic skincare ingredients or advanced peptide-based formulations into their skincare routine

For long-term storage of unopened vials, the freezer is fine (up to 3 years), but once liquid hits that powder, the fridge is its only home

Mills K.F., Yoshida S., Stein L.R., et al

Oh and I forgot to mention a really important factor as well
Frois, C., Wu, E
