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Because this peptide operates upstream on Wnt signaling and follicle nutrition rather than through vasodilation, combining the two has become a common research design
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GHK-Cu, a naturally occurring copper-binding peptide, primarily targets skin rejuvenation and wound healing through collagen stimulation (Pickart et al., Journal of Cosmetic Dermatology, 2018)
Common side effects include nausea, headaches, fluid retention, and injection-site irritation, per Chicago Arthritis and Couture Med Spa
A study comparing GHK-Cu to retinoic acid found that GHK-Cu stimulated collagen production in 70% of treated women, compared to 40% for retinoic acid, with significantly less irritation