is glow better than ghk cu Safe? Understanding Multi-Peptide Stacks Mask

GHK-Cu Copper Peptides Serum, Anti-Aging Serum with Copper Tripeptide, Multi-Peptide & Collagen & Hyaluronic Acid, Peptides Serum for Reducing Fine Lines and Skin Elasticity, Firming, Hydrating, 30ml Beauty

But there is no established human GHK-Cu study showing that a sublingual product produces predictable systemic bioavailability or superior clinical results

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noted copper peptides may modulate some growth factor activity, but direct 5-alpha reductase inhibition comparable to finasteride or dutasteride is not established