
Everything You Wanted to Know About B12 (Part 1)
From Nutrition Facts with Dr. Greger by Michael Greger, M.D. FACLM
May 7, 2026
About this episode
This episode discusses vitamin B12 deficiency, its symptoms, and the best ways to test for and source B12.
Including the symptoms of vitamin B12 deficiency This episode features audio from: How Long Does It Take to Become Vitamin B12-Deficient and What Are the Symptoms? The Best Way to Test for Vitamin B12 Deficiency The Best Source of Vitamin B12: Supplements, Shots, or Fortified Foods? Visit the video pages for all sources and doctor’s notes related to this podcast.  
People in this episode
Host: Michael Greger, M.D. FACLM
Topics covered
- vitamin B12
- deficiency symptoms
- testing for deficiency
- supplements
- fortified foods
Keywords
- B12
- vitamin deficiency
- health
- nutrition
- supplements
Mentioned in this episode
Books & works: How Long Does It Take to Become Vitamin B12-Deficient and What Are the Symptoms?, The Best Way to Test for Vitamin B12 Deficiency, The Best Source of Vitamin B12: Supplements, Shots, or Fortified Foods?
More episodes of Nutrition Facts with Dr. Greger
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- What’s Taurine and Why Do We Care? (Part 3) · May 28, 2026
- What’s Taurine and Why Do We Care? (Part 2) · May 21, 2026
- Everything You Wanted to Know About B12 (Part 2) · May 14, 2026
- Are Statins Worth It? (Part 2) · April 30, 2026
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