when b12 injections don't work Why aren't my b12 shots working : r/B12_Deficiency Best Vitamin B12 Injection Site:

Whenever people find it difficult to maintain adequate vitamin B12 levels, either because they have an absorption problem or follow a vegan or vegetarian diet, B12 supplements often come to their aid

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doi:10.1136/bmjopen-2014-006964

We recognize the unique needs of vegetarians and vegans, who might not get enough B12 from plant-based diets

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