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Causes and Risk Factors for Deficiency Many things can cause low Vitamin B12 levels
Absorption depends on gut health, so they often work slower than injections and may not be effective for everyone
Do vitamin B12 supplements have side effects
They usually last 30 minutes to an hour
The injections sit in the muscle tissue as kind of a reservoir and slowly leak out over time into the blood, explains Joshua Miller, Ph.D., a B12 researcher, and professor and chair in the Department of Nutritional Sciences at the School of Environmental and Biological Sciences at Rutgers University
Disclaimer The statements in this article have not been evaluated by the Food and Drug Administration
