When to see a doctor Please seek medical advice promptly if you have any of the following after a B12 injection: Chest pain, a fast or irregular heartbeat, or breathlessness
You may need B12 injections if you: Have been diagnosed with pernicious anemia Have gastrointestinal issues (e.g., Crohns disease, celiac disease, or after bariatric surgery) Follow a strict vegan or vegetarian diet without adequate supplementation Are over the age of 50, as absorption decreases with age Take certain medications that interfere with B12 absorption Have chronic fatigue, memory issues, or nerve problems due to B12 deficiency
Good dietary sources include meat, poultry, fish, eggs, and dairy foods. Vegetarians, vegans, and people with limited intake of animal products often rely on fortified foods such as plantbased milks, breakfast cereals, or nutritional yeast, but these may not fully meet daily needs in every case
On their own, B12 injections are unlikely to cause meaningful weight loss
breakdownis crucial for studying obesity, insulin resistance, and metabolic health
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