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Copper is a critical trace element involved in numerous biological processes, including the formation of red blood cells, the function of the immune system, and the maintenance of connective tissues
It can mean more binding protein in circulation, vitamin released from injured cells, reduced clearance by the liver or kidneys, recent intake, or analytical interference, where the measured value does not accurately reflect the true B12 status
It offers a valuable complementary angle for studying the neuroendocrine control of sleep and circadian timing
Mild redness or soreness at the injection site may occur but typically resolves quickly
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