[73] Streptomyces griseus , a bacterium once thought to be a fungus, was the commercial source of vitamin B 12 for many years
Injections are very effective at raising blood levels of vitamin B12 and preventing or reversing a B12 deficiency
[44] [41] Vitamin B 12 is not one of the supplements recommended by the World Health Organization for healthy women who are pregnant, [14] however, vitamin B 12 is often suggested during pregnancy in a multivitamin along with folic acid [45] [46] especially for pregnant mothers who follow a vegetarian or vegan diet
doi:10.1210/endo.142.12.8522 Heffernan MA, Thorburn AW, Fam B, et al
For individuals with a confirmed deficiency, a b12 injection can be life-changing, restoring energy and mental clarity
Since nerve conditions are sometimes due to a vitamin deficiency, a doctor might suggest B12 injections to ensure enough of the vitamin gets into your bloodstream and to the affected nerve.