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Source: FDA briefing document, Pharmacy Compounding Advisory Committee, July 2026

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

Aggressive dieting and injury recovery are not a great combination

investigators considered them unrelated, but no long-term oncology safety data exists)