ri·​bo·​fla·​vin ˌrī-bə-ˈflā-vən How to pronounce riboflavin (audio)
: a yellow crystalline compound C17H20N4O6 of the vitamin B complex that occurs both free (as in milk) and combined (as in liver) as a component of coenzymes (such as FMN) which are essential to normal metabolism

called also vitamin B2

Examples of riboflavin in a Sentence

Recent Examples on the Web According to researchers of this 2021 study published in the Nutrients journal, by adding just one egg in the morning, including the yolk, intakes of pantothenic acid, riboflavin, selenium, and vitamin D increased over 10 percent. Brittany Edelmann, Discover Magazine, 9 Jan. 2024 Here is a list of everything that makes the battery work: Quercetin, a pigment found in almonds and capers, serves as the battery cathode, whereas riboflavin (vitamin B2) makes up the battery anode. Rupendra Brahambhatt, Ars Technica, 9 May 2023 Avocados are packed with monounsaturated fats, fiber, vitamins C, E, K, and B-6, and nutrients like riboflavin, niacin, folate, pantothenic acid, magnesium, and potassium. Nick Blackmer, Verywell Health, 6 Nov. 2023 There are also supplements and vitamins that have been found to control excess sebum production, such as vitamins B6 and B2 (riboflavin). Danielle Sinay, Glamour, 5 Oct. 2023 There are a series of vitamins found in eggs, including vitamins A, B12, D, E, biotin, riboflavin and thiamine. Olivia Munson, USA TODAY, 30 Aug. 2023 And, research also found the highest intake of yogurt was linked with higher calcium, iodine and riboflavin consumption in children compared with non-yogurt eaters. Delaney Nothaft, USA TODAY, 20 July 2023 One key component is the riboflavin supplement, which plays a vital role in supporting the kidneys' ability to filter waste products from the blood. Amber Smith, Discover Magazine, 15 Aug. 2023 Magnesium, for example, is an essential mineral that plays a key role in muscle and nerve function, while riboflavin and B6 work to promote energy production and reduce inflammation. Amber Smith, Discover Magazine, 29 July 2023 See More

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

Word History


International Scientific Vocabulary ribo- + Latin flavus yellow — more at blue

First Known Use

1935, in the meaning defined above

Time Traveler
The first known use of riboflavin was in 1935

Dictionary Entries Near riboflavin

Cite this Entry

“Riboflavin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/riboflavin. Accessed 2 Mar. 2024.

Kids Definition


ri·​bo·​fla·​vin ˌrī-bə-ˈflā-vən How to pronounce riboflavin (audio)
: a vitamin of the vitamin B complex that helps growth and is found both free (as in milk) and combined with other substances (as in liver)

called also vitamin B2

Medical Definition


ri·​bo·​fla·​vin ˌrī-bə-ˈflā-vən, ˈrī-bə-ˌ How to pronounce riboflavin (audio)
variants also riboflavine
: a yellow crystalline compound C17H20N4O6 that is a growth-promoting member of the vitamin B complex and occurs both free (as in milk) and combined (as in liver)

called also lactoflavin, ovoflavin, vitamin B2

More from Merriam-Webster on riboflavin

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