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Another factor that can increase the risk of a B12 deficiency is a lack of a diverse diet, says Emily Peron, associate professor in the department of pharmacotherapy and outcomes science at Virginia Commonwealth University

However, an oral B12 dose is often larger because your body usually doesnt absorb it all

Popular combinations include:

Avoid combining with sedating substances or prescription sleep medications

For weight loss patients who struggle to maintain exercise routines because of low energy, B12 injections address the nutritional foundation that makes sustained physical activity possible

This mechanical effect complements the central nervous system effects, providing multiple reinforcing signals that reduce total food intake without requiring conscious effort