The injection bypasses the stomach and intestines, allowing the body to absorb the vitamin more efficiently
These include: Autoimmune diseases, such as hypoparathyroidism, Graves disease, myasthenia gravis, and type 1 diabetes Crohns disease HIV Vitiligo Celiac disease Having part or all of your small intestine removed Small intestine bacterial overgrowth, a condition where you have harmful bacteria in your intestines that absorb all the B12 before your intestines can Other risk factors for pernicious anemia include: Scandinavian or Northern European ancestry Family history of PA Having gastric bypass surgery (used to treat obesity), which loses cells that absorb B12 Taking medications such as antacids or drugs that treat type 2 diabetes but make it harder for your body to absorb enough B12 Pernicious Anemia Symptoms Symptoms of pernicious anemia may take years to develop because your body can store 1,000 to 2,000 times as much B12 as you need in a day
Frequency depends on your wellness goals, diet, and provider guidance
B12 shots might benefit people dealing with: Constant tiredness Low blood cell counts Trouble digesting Pernicious anemia Low nutrient levels Struggles with weight loss A study showed that injecting B12 into the muscle raised levels in the blood faster and kept them higher for longer than taking B12 by mouth in those with absorption problems