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Fatigue, weakness, especially lightning bolt sensations type of pain, joint pain, muscle pain, cognitive impairment, anxiety unrelated to stressors (eg a physical anxiety without a life trigger), depersonalization / derealization, depression, skin sensitivity, emotional lability, thermal lability, vertigo, dizziness, nausea, vomiting - and more

This is not a speculative concern it is precisely why parenteral nutrition copper dosing is an order of magnitude lower than oral intake, at 0.30.5 mg/day, and why the dose is reduced, with monitoring of serum concentrations, in cholestasis where biliary excretion is impaired

Bates LS, Waldren RP, Teare ID

[2] Xu B, Yang M, Li Z, Zhang Y, Jiang Z, Guan S, Jiang D