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Experts recommend that patients take specific B12 supplements with about 1,000 micrograms daily for effective results

Vitamin B12 injection dose

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More than 75% of people had low levels of methylmalonic acid (the best indicator of B12 deficiency), which would indicate that they were supplementing and out of danger (or that they had not been without supplementation long enough for levels to rise), but in 11 of the volunteers (5 OLV and 6 vegans) the levels were above the established cutoff point, of which 10 had plasma B12 levels “in range,” which would indicate a subclinical deficiency despite having apparently correct B12 in the analysis