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long-term effects on NAD+ metabolism, liver function, and cardiovascular health are unknown

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Most remarkably, the enhanced muscle stem cell activity translated to dramatic improvements in functional muscle performance

Fortunately, there is increasing evidence that oral B12 supplements are just as good as injections for raising blood levels in most people ( Vegetarians and vegans are usually advised to take at least 10 mcg per day, or at least 2,000 mcg once per week ( However, some doctors still prefer the use of injections