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Three specific gaps separate this preclinical evidence from a human recommendation, and it is worth naming each so the framing throughout this guide is not mistaken for false modesty
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Your doctor will consider factors like your current B12 levels, weight, age, and health goals
Details of the statistical models are available in Methods
Vitamin B12 toxicity from supplements is extremely rare because it is water-soluble and excess amounts are excreted through urine
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