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Retrieved from FDA website on bulk drug substances and compounding guidelines

The clinical trial most often cited is Leyden and colleagues' 2002 randomized 12-week trial of a GHK-Cu facial and eye cream in 71 women with photoaged skin [4]

For most researchers, the two-compound stack represents a clean, manageable protocol without the complexity of managing multiple compounds simultaneously

1 With its powerful anti-aging and skin-repairing properties, it may help restore a youthful, radiant complexion

The trade-off is larger injection volumes at standard doses: a 2.5mg dose requires 75 units, and a 5mg dose requires 150 units (two syringe draws)