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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
This site might be particularly suitable for those who find it easier to see and reach their thighs compared to other areas
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No reliable human evidence shows that AHK-Cu or GHK-Cu directly blocks DHT
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