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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
Glycated hemoglobin (HbA1C) 6.5% or greater
NNMT inhibition with 5-Amino-1MQ reduced white adipose tissue mass by ~35% in diet-induced obese mouse models without suppressing food intake, suggesting energy expenditure modulation
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