The Honest Verdict GHK-Cu and retinol are not rivals
Jagdhari, S., Panchbhai, A., Motwani, M., & Gunwal, M

Showing 33 compounds GLP-3 RT Metabolic Regulation Studies HPLC 99%+10mg60mg GHK-Cu Collagen Synthesis Studies HPLC 99%+50mg100mg NAD+ Cellular Energy Studies HPLC 99%+500mg1000mg MOTS-c Mitochondrial Metabolism Studies HPLC 99%+10mg GLP-2 TZ Blood Sugar Regulation Studies HPLC 99%+10mg100mg Tesamorelin Growth Hormone Release Studies HPLC 99%+10mg KLOW Blend Regenerative Peptide Blend HPLC 99%+80mg COA SS-31 Mitochondrial Function Studies HPLC 99%+10mg BPC-157 / TB-500 Regenerative Peptide Blend HPLC 99%+20mg BPC-157 Tissue Repair Studies HPLC 99%+10mg20mg Glow Skin Renewal Blend HPLC 99%+70mg CJC / IPA Blend Growth Hormone Secretagogue HPLC 99%+10mg KPV Inflammation Pathway Studies HPLC 99%+10mg PT-141 Melanocortin Arousal Studies HPLC 99%+10mg 5-Amino-1MQ NNMT Inhibition Studies HPLC 99%+50mg Semax Cognitive Function Studies HPLC 99%+10mg COA L-Glutathione Oxidative Stress Studies HPLC 99%+1500mg Melanotan II Melanin Production Studies HPLC 99%+10mg TB-500 Cell Migration Studies HPLC 99%+10mg COA HCG Hormone Support Compound HPLC 99%+10,000 IU Selank Stress Response Studies HPLC 99%+10mg COA Sermorelin GH Secretion Studies HPLC 99%+10mg COA ARA-290 Tissue Repair Peptide HPLC 99%+10mg Ipamorelin GH Pulse Studies HPLC 99%+10mg Epithalon Telomere Lengthening Studies HPLC 99%+50mg GLP-1 S Appetite Regulation Studies HPLC 99%+20mg IGF-1 LR3 Growth Factor Peptide HPLC 99%+1mg CJC-1295 DAC Growth Hormone Releasing Peptide HPLC 99%+5mg COA Thymosin Alpha-1 Immune Response Studies HPLC 99%+10mg COA DSIP Sleep & Recovery Peptide HPLC 99%+5mg CJC-1295 GH Half-Life Studies HPLC 99%+5mg Pinealon Cognitive Peptide HPLC 99%+10mg COA Kisspeptin Reproductive Hormone Studies HPLC 99%+10mg For laboratory research use only

And no amount of moisturizer can truly heal that problem
12 g/day found to benefit antioxidant capacity
Most published data derive from small pilot studies, in vitro experiments, and animal research, which substantially limits the conclusions that can be drawn