b12 injections and grey hair for Hair: What It Does, What It Doesn't, When It Matters Vitamin B12 deficiency and grey
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A 1 mL solution has 1000 mcg of Vitamin B12

If a patients situation is truly exceptional and a doctor can justify a deviation from the guidelines, it may be possible

It may also help to focus on getting the vitamins from food instead, start with a very low dose, and be sure to use a reputable supplement manufacturer

[DOI] [PMC free article] [PubMed] [Google Scholar] 32.Paul P., Campbell G., Zekeridou A., Mauermann M., Naddaf E