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PMC 3645767
To counteract this and make the drug effective for a longer time, inhibitor molecules like that in PDB entry 3gss can be administered along with the drug to inhibit the action of the enzymes
In short: You should be extremely cautious
Food Sources of Vitamin B12 meats fish shellfish poultry milk and milk products eggs cereal (fortified) nutritional yeast (fortified) Vitamin B12 is found only in animal protein foods and fortified foods
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