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Peer-reviewed studies on GHK-Cu Maquart FX, Pickart L, Laurent M, et al

Duzel A, Vlainic J, Antunovic M, Malekinusic D, Vrdoljak B, Samara M, et al

209 In a clinical trial in 90 obese adults, a 16-week aerobic training program consisting of a warmup (1015 minutes) and exercise (3550 minutes) using a treadmill three times per week improved sperm count, motility, and morphology, in addition to levels of serum testosterone

These are given either in the muscle (intramuscularly) or under the skin (subcutaneously)

The Biden administration in 2023 found that nearly 20 peptides raised safety concerns and barred their legal compounding