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doi: 10.1016/j.cell.2010.12.016

In mouse models, copper deficiency impairs cardiac function, manifesting as reduced diastolic and systolic performance alongside a diminished inotropic response to beta-adrenergic stimulation, which compromises the heart's ability to adapt to stress [206]

I dont think of this as a performance-enhancing drug in the same way as EPO or an anabolic steroid, McGuire says

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Safety Information Close the container firmly and keep it in a cool, dry place away from direct sunlight and moisture is best

[1] Additionally, the product should be stored out of reach of children