what is injectable vitamin b12 used for Injection at a Licensed Pharmacy Vitamin B12 shots: Uses, benefits,

Require nutrient support during calorie restriction or elimination diets

doi: 10.1111/j.1471-0528.2008.01822.x

No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out

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These lower values are already considered problematic, and even values above them often cause problems, or we may remain asymptomatic but with a subclinical deficiency or problems that we do not associate with low B12 status, or on the verge of real problems, all of which, as we already know, are highly unlikely to lead to anemia as such