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Unlike many peptides that have only injectable research data, GHK-Cu has been tested in published human clinical trials specifically as a topical application with outcomes that compared favorably against gold-standard actives

Notably, the effects of metformin exhibited a significant dose-dependent relationship (Zhai et al., 2019)

Vaughn AR, Branum A, Sivamani RK

The 7 Most Popular Peptide Stacks on the Internet What the Science Actually Says By Lilian E

Deficiency can cause fatigue, nerve issues, and memory problems

It is stored in the liver and is necessary for appetite, energy maintenance, production and growth