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Formulators and analytical chemists should note that the copper-chelated GHK-Cu component imparts a characteristic blue tint upon reconstitution and requires attention to buffer selection, pH range, and avoidance of strong reducing or chelating agents that can perturb the copper coordination sphere
doi:10.1080/15287390802328630
It is suggested to label the container to avoid hazards
Li, G.D
Copper, zinc and pyrroles Anxiety and mood symptoms may reflect copper overload, low zinc, pyroluria or mixed biochemical patterns rather than a primary MTHFR problem
doi: 10.1210/jcem-55-5-1003
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