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Since B12 contains cobalt, people with known sensitivities should not receive injections
Post-Injection Care You may experience a mild tingling or warmth at the injection site, but side effects are rare
No systemic toxicity has been reported in human or animal studies
In rodent studies, animals with greater GLUT4 expression display heightened insulin sensitivity, whereas those with reduced GLUT4 levels demonstrate impaired insulin signaling
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