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Annals of Pediatric Endocrinology & Metabolism
A 2016 study published in Nature Scientific Reports directly compared copper compounds and found that while copper chloride and copper acetate were highly cytotoxic, GHK-Cu showed no cytotoxicity across all tested concentrations and did not induce inflammatory markers
For eye-area products, 2% is more appropriate because the skin around the eyes is thinner and more reactive
People with chronic joint stiffness or mild osteoarthritis often report reduced morning stiffness and improved range of motion
The clinical protocol permitted administration into three anatomical regions: the periumbilical abdomen (avoiding the navel itself), the anterior thigh, and the lateral upper arm
Because there is no proven human dose limit, users often guess
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