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B12 supplements are often used to treat or prevent deficiency, which can lead to symptoms such as fatigue, weakness, constipation, loss of appetite, and megaloblastic anemia

Petri The agency is considering whether compounding pharmacies should be allowed to produce BPC-157, TB-500 and other previously banned peptides

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Vitamin B12 shots are often prescribed for people with: Pernicious anemia (autoimmune destruction of intrinsic factor needed for B12 absorption) Gastrointestinal surgeries (e.g., gastric bypass, ileal resection) Crohns disease or celiac disease Chronic alcoholism Long-term use of acid-reducing medications Vegan diets without supplementation Infants or children with congenital absorption disorders (i.e., vitamin B12 for kids in clinical care) Injections ensure direct delivery into the bloodstream, bypassing the digestive system entirely