Step 3 Place the tip of the drawing needle in the bottom of the ampoule
Certain people may experience reactions in the gastrointestinal tract after getting a vitamin B12 shot
This complex process means that conditions affecting the stomach or intestines can significantly impair B12 absorption, including pernicious anaemia, atrophic gastritis, previous gastric surgery, coeliac disease, Crohn's disease, and long-term use of certain medications (such as metformin, proton pump inhibitors, and H2 antagonists)
While some foods like plant-based milks and cereals are fortified with B12, relying on them isnt always enough to meet your bodys needs
Deficiencies can occur with medical conditions such as atrophic gastritis (which causes thinning of the stomach lining), pernicious anaemia, Crohns disease, celiac disease, lupus, or other immune system disorders and certain medications
Lancet Neurol