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Neurological, psychiatric, and biochemical aspects of thiamine deficiency in children and adults
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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
Continuous use without cycling can lead to receptor desensitization, diminishing returns, and unknown long-term effects
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