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For really bad cases, you might need more, and shots are given once a week, or as the doctor says
providers to ensure that treatment is safe, effective, and tailored to your needs
Injections have better bioavailability than oral supplements as they bypass the digestive system completely, providing a direct supply of B12 into the bloodstream to fuel your body
When you swallow a B12 pill, several steps have to work for it to be absorbed: stomach acid and the enzyme pepsin must release B12 from food or the supplement, the stomach must secrete a protein called intrinsic factor that binds to B12, and the B12-intrinsic factor complex must reach the ileum (the end of the small intestine) where it is finally absorbed
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