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However, blood sampling is invasive, requires trained personnel, and represents only a narrow detection window

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

Some medications (especially certain biologicals or vaccines) require saline or preservative-free water, so always follow the drug manufacturers guidance

If you notice increased anxiety after starting B12 supplementation, it's worth discussing with your provider

Without intrinsic factor, the small intestine cannot efficiently absorb dietary B12 through the normal receptor-mediated pathway