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Clinicians estimate vitamin B12 requirements using values such as: Recommended dietary allowance (RDA): RDArefers Trusted Source National Institutes of Health Office of Dietary Supplements Go to sourceto a daily intake that, on average, is enough to meet the nutritional requirements of almost all people without underlying health conditions
Unlike oral supplements, they bypass the digestive system so your body gets what it needs right away
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2020;25(6):e12761
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