Vitamin B12 is obtained through food sources such as beef, liver, chicken, fish (trout, salmon, tuna, clams), fortified breakfast cereals, lowfat dairy products, and eggs
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
Dose and frequency depend on your B12 levels and underlying condition
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B12 Shots & B12 Injections: Examining the Positives, Negatives, and Ways to Address Negative Reactions