Great sources for readingย
https://www.hindawi.com/journals/bmri/2015/648108/
https://www.hindawi.com/journals/bmri/2014/151479/.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073405/
http://www.skinbiology.com/Articles/AntiAgingActivityofGHK_JARCPFinal.pdf
https://pubmed.ncbi.nlm.nih.gov/28370978/
https://pubmed.ncbi.nlm.nih.gov/27517151/
https://www.mdpi.com/2079-9284/2/3/236/htm