Friday Favorites: How to Test for Functional Vitamin B12 Deficiency

NutritionFacts.org Video Podcast - A podcast by Michael Greger, M.D. FACLM

Try Bookbeat 60! days for free, click here

Enjoy a whole world of audiobooks and e-books, everything from new releases to the classics

Many doctors mistakenly rely on serum B12 levels in the blood to test for vitamin B12 deficiency.