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General guidance that many providers follow looks like this: There's no single schedule that fits everyone

It plays a vital role in brain function and the production of DNA and red blood cells and can: Increase Energy Levels and Concentration Improve Metabolism Boost energy Boost the Immune System Help Improve Sleep Patterns Improve Mood and Symptoms of Depression Benefit Brain by Preventing the Loss of Neurons Vitamin B12 deficiency has been associated with memory loss, especially in older adults

doi:10.1111/j.1365-2141.2009.07937.x

If you are sensitive, or you experience fatigue as opposed to an increase in energy when taking vitamin B12 then using a smaller dose less frequently will likely be better for your body

It plays a critical role in converting food into ATP (adenosine triphosphate), the molecule your cells use as fuel