Unless a doctor prescribes 1,000 mcg (1 mg) to correct a deficiency, most people should be taking a much lower dose of vitamin B12
Mazzucchi, E., Brinzeu, A
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Zhong, Nanosuspension drug delivery system: preparation, characterization, postproduction processing, dosage form, and application, in Nanostructures for Drug Delivery, Elsevier, 2017, pp