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GHK-CU GHK-Cu is a naturally occurring copper-binding tripeptide found in human plasma, saliva, and urine
GHK-CU has by far the most extensive research, with studies spanning decades covering wound healing, gene expression, collagen synthesis, and anti-aging effects
Nausea was the most common adverse event, followed by vomiting, diarrhea, and constipation, all more frequent in the higher-dose arms
Most people feel so good that they don't want to stop
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