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Much of the current evidence is preclinical (cell and animal studies), and human data is still limited
So few documented side effects mainly reflects absence of rigorous data , not proof of safety
And while no major risks have been documented in these studies, some researchers worry about the potential tumor-growth concern mentioned earlier
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GHK-Cus primary research applications skin regeneration, wound healing, hair growth, and cosmetic anti-aging all involve tissues that can be reached through topical delivery
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