vitamin B12

noun

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 In the older adult population, it is estimated that 3-43% have a vitamin B12 deficiency. Casey Seiden, Verywell Health, 19 June 2024 Some women are more likely to benefit from a supplement, including: Those following restrictive diets: Those who follow vegetarian or vegan diets will need to supplement their diets with vitamin B12 and possibly other nutrients, such as iron and calcium, through fortified foods or supplements. Sarah Anzlovar, Ms, Rd, Verywell Health, 4 June 2024 One packet not only contains milk thistle, fenugreek, and fennel but also collagen, vitamin C, vitamin B6, and vitamin B12. Lainey Younkin, Ms, Rd, Parents, 15 May 2024 This flaky, white fish is an excellent source of vitamin B12. Bethany Thayer, Detroit Free Press, 11 May 2024 The beverage also has some of the highest amounts of vitamin B12. Cynthia Sass, Mph, Health, 21 Apr. 2024 Along with methylfolate, Thorne also provides 600 mcg of vitamin B12 as methylcobalamin—the active form of vitamin B12 naturally found in food. Lainey Younkin, Ms, Rd, Verywell Health, 22 Mar. 2024 Studies show recreational whippet use can lead to adverse health outcomes, like vitamin B12 inactivation and deficiency. Arpan Lobo, Detroit Free Press, 13 Mar. 2024 For example, taking high doses of folate can mask a vitamin B12 deficiency, while taking high doses of magnesium can lead to GI upset, nausea, irregular heartbeat, and cardiac arrest. Erika Prouty, Verywell Health, 11 Apr. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'vitamin B12.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1948, in the meaning defined at sense 1

Time Traveler
The first known use of vitamin B12 was in 1948

Dictionary Entries Near vitamin B12

Cite this Entry

“Vitamin B12.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vitamin%20B12. Accessed 14 Jul. 2024.

Kids Definition

vitamin B12

noun
-ˈbē-ˈtwelv
: a member of the vitamin B complex that contains cobalt, occurs especially in liver, and is needed for normal blood formation, nerve function, and growth
also : any of several other compounds with similar activity

Medical Definition

vitamin B12

noun
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

More from Merriam-Webster on vitamin B12

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