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The Best Source of Vitamin B12: Supplements, Shots, or Fortified Foods?

30.7K views· 908 likes· 4:48· Nov 19, 2025

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Is it true we can actually absorb some B12 from our own microbiome? Is duckweed, nori, chlorella, or spirulina a reliable source of vitamin B12? This is the third video in a five-part series on vitamin B12. If you missed the previous two, check out How Long Does It Take to Become Vitamin B12-Deficient and What Are the Symptoms? (https://nutritionfacts.org/video/how-long-does-It-take-to-become-vitamin-b12-deficient-and-what-are-the-symptoms) and The Best Way to Test for Vitamin B12 Deficiency (https://nutritionfacts.org/video/the-best-way-to-test-for-vitamin-b12-deficiency). Stay tuned for How Much Vitamin B12 Do We Need Each Day? (https://nutritionfacts.org/video/how-much-vitamin-b12-do-we-need-each-day) and Are Large Weekly Doses of Vitamin B12 Safe? (https://nutritionfacts.org/video/are-large-weekly-doses-of-vitamin-b12-safe). For more on vitamin B12, check out the topic page (https://nutritionfacts.org/topics/vitamin-b12/). New subscribers to our e-newsletter always receive a free gift. Get yours here: https://nutritionfacts.org/subscribe/. Have a question about this video? Leave it in the comment section at http://nutritionfacts.org/video/the-best-source-of-vitamin-b12-supplements-shots-or-fortified-foods and someone on the NutritionFacts.org team will try to answer it. Want to get a list of links to all the scientific sources used in this video? Click on Sources Cited at https://nutritionfacts.org/video/the-best-source-of-vitamin-b12-supplements-shots-or-fortified-foods. You’ll also find a transcript and acknowledgements for the video, my blog and speaking tour schedule, and an easy way to search (by translated language even) through our videos spanning more than 2,000 health topics. Thanks for watching. I hope you’ll join in the evidence-based nutrition revolution! -Michael Greger, MD FACLM Captions for this video are available in several languages; you can find yours in the video settings. View important information about our translated resources: https://nutritionfacts.org/translations-info/ https://NutritionFacts.org • Subscribe: https://nutritionfacts.org/subscribe • Donate: https://nutritionfacts.org/donate • Podcast : https://nutritionfacts.org/audio • Books: https://nutritionfacts.org/books • Shop: https://drgreger.org • Facebook: https://www.facebook.com/NutritionFacts.org • Twitter: https://twitter.com/nutrition_facts • Instagram: https://www.instagram.com/nutrition_facts_org

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