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While B12 is often marketed as an energy booster, there is no scientific evidence that excess B12 improves metabolism or energy levels in people who already have adequate levels
Vitamin D Vitamin D is a fat-soluble vitamin that is necessary for proper absorption of calcium and bone mineralization
Dietary deficiency: Strict vegans or very poor diets may lack animal-source B12
Adequate B12 levels may contribute to improved mental health and overall well-being
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