Neomycin, colchicine, para-aminosalicylic acid, or excessive alcohol intake longer than two weeks may cause malabsorption of vitamin B12
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How a B12 injection actually works Vitamin B12 (cobalamin) is a water-soluble vitamin your body cant make on its own and can only get from food or supplementation
In severe cases, prolonged B vitamin deficiency can lead to beriberi, pellagra, or Wernicke-Korsakoff syndrome, the last of which causes serious neurological problems
However, vitamin B12 as part of a multivitamin, is perfectly safe to take at home
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