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Description
How to Test for Functional Vitamin B12 Deficiency Many doctors mistakenly rely on serum B12 levels in the blood to test for vitamin B12 deficiency
The delivery route matters enormously, and the human evidence base for either route is far thinner than the online discussion suggests
Vitamin B12 is found in animal-based foods including dairy products, meat, poultry, and fish
1998 Sep 17;339(12):792-8
