When taken internally, GHK-Cu may have more severe side effects, from skin irritation to headaches and nausea
Finer, N., Craddock, D., Lavielle, R
For instance, studies have demonstrated that although NCEH activity was indeed absent in HSL-null adipocytes, a substantial fraction of catecholamine stimulated lipolysis (90, 94), and most, if not all, basal lipolysis remained (30, 134)
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Key Takeaways GHK-Cu (Copper Tripeptide-1) at 1 to 5 percent concentration shows measurable collagen I and III upregulation in fibroblast studies, but human RCT data are limited to small cosmetic trials