who shouldnt have b12 injections Doctor Reveals Facts About 4 Benefits of B12 Shots
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Vitamin Injection FAQs What is a vitamin injection for

Reaches therapeutic drug concentrations at the site of infection within the lung in 1-2 hours

Kidney overload: High levels of vitamin B12 require the kidneys to work harder to eliminate it, which could lead to kidney stress and, in severe cases, kidney damage
2015 Dec;119:146-65