Just stick with it, because skipping days might slow down the results
It appears that not all studies showed corroborative effects
doi: 10.1111/and.2019.51.issue-1 36 BischoffNSde KokTMSijmDTvan BredaSGBriedJJCastenmillerJJet al
What GHK-Cu adds to the formulation: Gene expression modulation across hundreds of genes including collagen genes (Type I, III), tissue inhibitors of metalloproteinases, anti-inflammatory mediators Collagen synthesis stimulation, specifically Type I and Type III collagen the structural proteins of skin, connective tissue, and many other tissues Anti-inflammatory signaling through investigated effects on TNF-, IL-6, and NF-B pathways Copper-peptide chemistry effects including cofactor activity for skin-relevant enzymes Skin-research and hair-research applications (the GHK-Cu literature in these areas is substantial) For the GHK-Cu deep-dive, see Copper Peptides Explained
Influence of glutathione S-transferases on cellular glutathione determination by flow cytometry using monochlorobimane
Such as kisspeptin (a gonadotrophin releasing hormone analog for reproductive health, promoted for increasing libido) and KPV, lysine-proline-valine, an alpha melanocyte-stimulating hormone, with purported anti-inflammatory and wound healing effects