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Efficacy of oral compared with intramuscular vitamin B-12 supplementation after Roux-en-Y gastric bypass: a randomized controlled trial
You Have Absorption Issues Some people have trouble properly absorbing vitamin B12 from foods and oral supplements due to digestive disorders like celiac disease or Crohns disease
Some Sources of Vitamin B1 Your body cant produce thiamine itself, so its important to eat foods that contain it every day
Conditions associated with elevated B12 levels include: Liver disease : Hepatocellular damage releases stored B12 into circulation, with levels correlating with disease severity in conditions such as cirrhosis, hepatitis, and hepatocellular carcinoma Renal impairment : Reduced kidney function decreases B12 clearance, leading to accumulation Haematological malignancies : Myeloproliferative disorders, acute leukaemia, and polycythaemia vera can elevate B12 through increased production of B12-binding proteins (transcobalamins) Solid tumours : Certain cancers, particularly those affecting the liver or gastrointestinal tract, may elevate B12 levels A specific concern relates to cyanocobalamin in patients with Leber's hereditary optic neuropathy , a rare mitochondrial disorder

Beyond the gut, a growing body of preclinical evidence suggests it plays a critical role in orchestrating the repair of the musculoskeletal system, specifically by accelerating the healing of bone fractures, ruptured tendons, torn ligaments, and damaged muscle fibers