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Research has shown that even in people without any underlying health conditions, when taking a 500 microgram oral supplement, only 10 micrograms (or 2%) is absorbed (Carmel, 2008)
While generally considered safe, high doses may affect the fetus or baby, so professional guidance is essential
Although uncommon, it is possible to have elevated B12 levels in a blood test, says Sheri Vettel, a registered dietitian nutritionist (RDN) with the Institute for Integrative Nutrition
The code has clear boundaries, and crossing them creates problems that take time to fix and sometimes can't be appealed at all
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