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Copper accumulation is theoretically possible with long-term, high-dose use, particularly in individuals with genetic copper metabolism disorders like Wilsons diseasethough the copper content in therapeutic GHK-Cu doses is minimal compared to dietary intake
Dickinson, D
Series A, Biological Sciences and Medical Sciences 78 (1): 7589
The most common administration-site reactions were injection-site reaction [150 events in 38 (5%) participants] and injection-site erythema [64 events in 42 (6%) participants]
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