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GHK-Cu and retinoids like tretinoin are both powerful actives, but using them together at the same time can cause skin irritation or reduce their effectiveness

Consider taking the two together for a synergistic effect

Research Evidence Summary Study The effect of tripeptide-copper complex on human hair growth in vitro Authors Hyun Keol Pyo, Hyeon Gyeong Yoo, Chong Hyun Won, Seung Ho Lee, Yong Jung Kang, Hee Chul Eun, Kwang Hyun Cho, Kyu Han Kim Institution Department of Dermatology, College of Medicine, Seoul National University, Seoul, Korea Journal Archives of Pharmacal Research, Vol

It was also found to aid recovery from brain injury