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Description
You may have a vitamin B12 deficiency
Sincerely, Anthony P.S

doi:10.1007/BF02837864

why or why not

Individuals allergic to Mecobalamin, cobalt, or vitamin B12, or those with severe Leber hereditary optic neuropathy or nasal blockages, should avoid using NASOCOBAL 250MCG NASAL SPRAY

So, if we add 20% to that two micrograms a day we came up with, that comes out to 2.4, which is, indeed, the RDA for B12 in the United States