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While there are many reasons why someone could feel fatigued, B12 is a part of the picture and correcting the deficiency can greatly improve energy levels
These products differ in how they are made, how much vitamin B12 they contain, and how often they should be given
Most published studies select a dose based on prior literature without systematically testing whether that dose is optimal for their specific endpoint
However, its crucial to be aware of the potential risks and side effects
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