can i use ghk cu with tretinoin Alternating 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 collagen production, while GHK-Cu repairs the skin Size:10mg/10mg/50mg (one vial) 1000 mcg ml bpc-157 legal status us
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