does a b12 injection give you energy How Vitamin Shots Improve Energy, Mood & Metabolism The Benefits of B12 Injections
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How prevalent is vitamin B12 deficiency among vegetarians? Nutrition Reviews 71(2) (2013): 110117

Patients should maintain realistic expectations and continue treatment as prescribed, even if immediate improvements are not apparent, as premature discontinuation can lead to symptom recurrence

Older Adults: Age-related changes, like decreased stomach acid, hinder B12 absorption from food
