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Symptoms of B12 Deficiency If youre not getting enough vitamin B12, you might feel downright awful
In clinical practice, a B1-B6-B12 injection may be considered when oral therapy is insufficient or not feasible, such as in malabsorption, severe deficiency, or when accelerated replenishment is desired under medical supervision
Individuals with Gastrointestinal Disorders: Such as Crohns disease, celiac disease, atrophic gastritis, or those who have had gastric bypass surgery or other stomach/intestinal resections, which can interfere with B12 absorption
PMID 11713213
So do people on metformin, people with absorption issues, and plenty of people who just chalk the tiredness up to a busy month