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A 2015 study in Cell Metabolism found that it plays a role in regulating blood sugar and metabolism, and that it can mimic some of the metabolic benefits of exercise in animal models

It helps with red blood cell production, keeps our nervous system healthy, and even contributes to a good mood

While efficacy matters, the tolerability and adverse effect profile often determines whether a treatment is suitable for long-term use

Regular retesting intervals allow for treatment optimization and ensure that therapeutic blood levels are maintained over time

4 from United States, 3 from Japan

B12 deficiency causes fatigue, anemia, and neurologic symptoms, and is more common in older adults, vegans, and those with malabsorption conditions