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Our results indicated that neither GHK nor GHK-Cu showed cytotoxic activity at the range of concentrations tested while CuCl 2 and Cu(OAc) 2 showed substantial cytotoxicity to the HaCaT cells at the highest concentration assayed, i.e., at 5800 M, after 30 mins treatment

Tagliazucchi, 2010

These are real studies published in real peer-reviewed journals

The n=16 insomnia trial measured sleep efficiency and sleep latency, not muscle soreness, creatine kinase, HRV, strength recovery, or training adaptation [4]

Deficiencies in DCX expression or function are associated with severe neurodevelopmental disorders, such as lissencephaly and subcortical band heterotopia

Increase of fat oxidation and weight loss in obese mice by a fragment of human growth hormone