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Important limitations you should know For people with normal B12 levels, the evidence is far less compelling
NNMT stands for nicotinamide N-methyltransferase
The study examined safety parameters and metabolic biomarkers over a 12-week treatment period [2]
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
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