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& Mukherjee, P

Its commonly used in clinical aesthetic settings or under the supervision of licensed professionals and is often marketed as a fast-acting solution for those who want a fairer, more even complexion

The Science Behind Copper Peptides and Skin Regeneration How Does GHK-Cu Improve Skin Elasticity

Jin RC, Mahoney CE, Coleman Anderson L, Ottaviano F, Croce K, Leopold JA, Zhang YY, Tang SS, Handy DE, Loscalzo J

Retinol has substantially stronger human RCT evidence for collagen remodeling and wrinkle reduction

This response was more limited to the gut, so may have helped more in people with gastrointestinal issues like irritable bowel syndrome and Crohns