do vegans need b12 injections Benefits Of B-12 For & Vegetarians Vitamin B12 Shots For Vegans
Description
KarimiPourSaryazdi A, Ghaffarifar F, Dalimi A, Dayer MS

Oral high-dose B12 (1,000-2,000 g daily) may be considered as an alternative for patients with dietary deficiency without malabsorption who prefer this route or cannot tolerate injections

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IMO might be worth encouraging the doctor to query the lab as to exactly what happened there