Acne can be triggered in one in ten people who get vitamin B12 injections. What do randomized controlled trials of high-dose daily vitamin B12 supplementation show about the effects on cancer risk, death, and longevity?

This is part of my extended look at B12. For background and my updated recommendations, see:
• The Symptoms of Vitamin B12 Deficiency (http://nutritionfacts.org/video/the-symptoms-of-vitamin-B12-deficiency)
• The Optimal Vitamin B12 Dosage for Adults (http://nutritionfacts.org/video/the-optimal-vitamin-B12-dosage-for-adults)
• Healthiest Food Sources of Vitamin B12 (https://nutritionfacts.org/video/the-healthiest-food-sources-of-vitamin-b12/)
• The Optimal Vitamin B12 Dosage for Kids, Pregnancy, and Seniors (https://nutritionfacts.org/video/the-optimal-vitamin-b12-dosage-for-kids-pregnancy-and-seniors/)
• The Best Type of Vitamin B12: Cyanocobalamin or Methylcobalamin? (http://nutritionfacts.org/video/the-best-type-of-vitamin-B12-cyanocobalamin-or-methylcobalamin)

All of these videos can be found in one digital download: Latest Vitamin B12 Recommendations (https://drgreger.org/collections/videos/products/b12-recommendations-digital).

I previously explored vitamin B12’s role in stroke risk. Check out:
• Vegetarians and Stroke Risk Factors: Vitamin B12 and Homocysteine? (https://nutritionfacts.org/video/vegetarians-and-stroke-risk-factors-vitamin-b12-homocysteine/)
• How to Test for Functional Vitamin B12 Deficiency (http://nutritionfacts.org/video/how-to-test-for-functional-vitamin-b12-deficiency)
• Should Vegetarians Take Creatine to Normalize Homocysteine? (http://nutritionfacts.org/video/Should-Vegetarians-Take-Creatine-to-Normalize-Homocysteine?)
• The Efficacy and Safety of Creatine for High Homocysteine (http://nutritionfacts.org/video/the-efficacy-and-safety-of-creatine-for-high-homocysteine)

That series is also available for digital download: Why Do Vegetarians Have Higher Stroke Risk? (https://drgreger.org/collections/videos/products/vegetarian-stroke-risk-digital).

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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/friday-favorites-do-vitamin-b12-supplements-cause-acne-bone-fractures-and-lung-cancer. 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/

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