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Conditions such as malabsorption or gastrointestinal disorders can hinder the absorption of B12 from oral supplements

Your hair follicles are among the fastest-dividing cells in your body, with cells in the hair bulb dividing every 23 to 72 hours

Taking a proton pump inhibitor or other medications that reduce stomach acid for reflux or ulcers, as well as taking metformin for diabetes, can reduce absorption of B12 in food or supplements

Unlike tablets, which have to pass through your digestive system, an injection goes straight into the bloodstream

What Side Effects or Risks Are Associated WithVitamin B12 Injection Dosage For Adults