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Nutrition Facts with Dr. Greger

Everything You Wanted to Know About B12 (Part 1)

Nutrition Facts with Dr. Greger

Michael Greger, M.D. FACLM

Alternative Health, Health & Fitness, Nutrition

4.83.7K Ratings

🗓️ 7 May 2026

⏱️ 14 minutes

🧾️ Download transcript

Summary

Including the symptoms of vitamin B12 deficiency

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Transcript

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0:00.8

Trying to stay healthy can seem like a full-time job sometimes, especially with all the conflicting

0:07.1

information that's out there.

0:08.7

But I'm here to make that job a little easier.

0:12.8

Welcome to the Nutrition Facts podcast.

0:15.0

I'm your host, Dr. Michael Greger.

0:18.3

For those eating plant-based diets, encouragement of vitamin B12 supplementation cannot be

0:23.6

overemphasized.

0:25.6

What happens if you don't get enough B12?

0:28.6

Well, the vitamin is necessary for the synthesis of DNA, so a deficiency in B12 can cause

0:34.6

pretty much anything.

0:36.6

Brain problems, psychiatric problems, sensory problems, constitutional problems, muscle problems,

0:41.3

nerve problems.

0:42.3

It can also cause clotting disorders and bleeding disorders.

0:46.3

It can make people catatonic, hallucinate, psychotic, even suicidal.

0:52.3

One patient got electroshock therapy before they realized,

0:56.4

oops, he was just B-12 deficient. Even more tragic are life-threatening manifestations of B-12

1:03.7

deficiency in infants when their moms aren't supplementing. Coma, respiratory failure, severe brain damage.

1:12.8

Viven-B-12 deficiency and pregnancy is the diagnosis not to miss.

1:18.6

I've done B-12 videos over and over again over the years.

1:23.2

Can we just stick to the consensus clinical guidelines

1:26.5

and preventing, diagnosing, and treating

1:28.6

B12 deficiency?

...

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