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GHK-Cu -

Biomaterials 104 , 5264 (2016)
[DOI] [PMC free article] [PubMed] [Google Scholar] 280.Liu G, Rui W, Zheng H, Huang D, Yu F, Zhang Y, et al

Since it cant be sold as a regulated medication, most of what is available online is sold as an unregulated research chemical. This means there is no oversight on purity or quality, and products can be contaminated with heavy metals or bacteria
