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doi: 10.1007/s12640-017-9809-7

Once the stores have been replaced then only maintenance injections will be required, depending on the reasons for the deficiency

One study found that even up to 2,000 micrograms a day of methylcobalamin wasnt enough to correct vitamin B12 deficiency in one of three vegans tested

Insert the needle into the vial, push the air in (to prevent a vacuum), and draw your prescribed dose into the syringe