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10.1016/j.neulet.2007.01.004 132
In sum: How much vitamin B12 you should take depends on whether youre aiming to meet your requirements through fortified foods, supplements, or a combination of both
Sweatt JD (2004)
Taking B12 too close to bedtime can be stimulating for some people and may make it harder to fall asleep or stay asleep. If you notice any change in your sleep after starting B12, simply move your dose earlier in the day and track how you feel
Long-term exposure and product impurities remain separate safety questions
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