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Insider's takeaway The Institute of Medicine has not established a tolerable upper intake level of B12 because studies show no adverse health effects when taking excess levels of B12, either through food or supplements
The Routes of Administration Once the form is chosen, the next decision is how the vitamin B12 gets into the body
The choice between these methods depends on factors such as the specific formulation, patient preference, and healthcare provider recommendations
If you have a compromised digestive system you may need extra B12
If canned is your preference, opt for light tuna in water
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