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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

Nausea, constipation, and reduced appetite occur in 30-50% of GLP-1 users and typically subside within 4-6 weeks

How long does a vitamin B12 injection last

Injections bypass the digestive system, ensuring 100% bioavailability regardless of digestive health or absorption issues

It stays in your system for a few days to weeks