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Side Effects and the Copper Uglies Explained GHK-Cu has a strong safety profile in topical research, but a small subset of users experience a transient phase known as the copper uglies. A 2023 clinical safety review covering 12 studies and 512 participants reported that the most common side effects of topical GHK-Cu were transient and mild

10.1111/j.1471-4159.2006.03907.x J Neurochem

The Food and Drug Administration said on Wednesday it plans to convene a panel of external experts to review the possible easing of restrictions on 12 peptides, which are widely used for purposes ranging from tanning and longevity to obesity treatment and wound healing

Muhammad Akram (2007)