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A 2023 safety review that analyzed 12 clinical studies involving 512 participants found that the most common side effects from topical GHK-Cu were transient redness (4.2% of participants) and mild itching (2.8%)
Nothing here is a human-use recommendation
The exact cause of rosacea is unknown, but its believed to be related to a combination of genetic, environmental, and vascular factors
Kanarek et al
The results were expressed in micromoles per deciliter and reported as changes from the baseline values
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