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Description
The evidence base is preclinical with one small human study

For topical users , medical professionals have conveyed to us that GHK-Cu often yields results along the following timeline: First two weeks: Users may notice better skin hydration, reduced redness or irritation, and smoother skin

doi: 10.1097/00041552-199601000-00014

For example, if you have a vitamin deficiency, it can affect your sleep
