vitamin B12

noun
\-ˈbē-ˈtwelv \

Definition of vitamin B12 

1 : a complex cobalt-containing compound C63H88CoN14O14P that occurs especially in liver, is essential to normal blood formation, neural function, and growth, and is used especially in treating pernicious and related anemias and in animal feed as a growth factor

called also cyanocobalamin

2 : any of several compounds similar to vitamin B12 in action but having different chemistry

Examples of vitamin B12 in a Sentence

Recent Examples on the Web

Doctors treated him for a vitamin B12 deficiency and a rare form of a neuromuscular disease called myasthenia gravis. Laurie Mcginley, Washington Post, "Devastated by ALS, trying to save others," 13 June 2018 The business offers a $99 monthly membership that discounts the cocktails by 30 percent and the add-ons, or boosters (such as vitamin B12), by 50 percent. Amy Bartner, Indianapolis Star, "Hungover? This place on Mass Ave. will inject you with a remedy," 31 May 2018 And in the morning, give yourself a jolt of energy with the caffeine, vitamin B12, and citicoline in Extra Batteries. Shannon Barbour, The Cut, "5 Vitamin Packs to Boost Your Beauty Routine," 25 May 2018 The most common deficiencies in the U.S. are iron, calcium, and vitamins B12 and D, Keatley says. Korin Miller, Allure, "Do You Need to Take a Multivitamin? Here's What Nutritionists Say," 3 May 2018 Oysters are also a great source of zinc — an undervalued mineral, said Ramsey — and vitamin B12. Rebecca Ungarino, NBC News, "5 foods that can boost your mood and make you feel happier," 11 Jan. 2018 Bonus: Nutritional yeast has protein and fiber, and many brands are fortified with vitamin B12, which helps the central nervous system function properly. OregonLive.com, "5 New Year's strategies for eating lean without compromising comfort, flavor," 2 Jan. 2018 That list includes a deficiency in vitamins B12 or D, multiple sclerosis, type 2 diabetes, and Parkinson’s disease, to name a few. Korin Miller, SELF, "Why You Shouldn’t Just Accept Being Tired All the Time," 3 Nov. 2017 Combat iron deficiency with vitamin B12 and foods including red meat, pork, poultry, seafood, beans, spinach, raisins, apricots, and peas. Allure, "How to Get Rid of Bags Under Eyes and Dark Circles the Affordable Way," 23 Oct. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'vitamin B12.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of vitamin B12

1948, in the meaning defined at sense 1

Keep scrolling for more

Learn More about vitamin B12

Share vitamin B12

Statistics for vitamin B12

Look-up Popularity

Time Traveler for vitamin B12

The first known use of vitamin B12 was in 1948

See more words from the same year

Keep scrolling for more

More Definitions for vitamin B12

vitamin B12

noun
\-ˈbē-ˈtwelv \

Medical Definition of vitamin B12 

1 : a complex cobalt-containing compound C63H88CoN14O14P found in animal products (as meat and eggs) that is essential to normal blood formation, neural function, and growth and is used especially in treating pernicious and related anemias and in animal feed as a growth factor

called also cyanocobalamin

2 : any of several compounds similar to vitamin B12 in action but having different chemistry

Comments on vitamin B12

What made you want to look up vitamin B12? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

something that serves to warn or remind

Get Word of the Day daily email!

Test Your Vocabulary

Autumn Words of the Day 2018

  • a-top-down-image-of-road-through-an-autumn-forest
  • Which is a synonym of fugacious?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!