al·​a·​nine ˈa-lə-ˌnēn How to pronounce alanine (audio)
: a simple nonessential crystalline amino acid C3H7NO2

Examples of alanine in a Sentence

Recent Examples on the Web Men’s Health Nutrition Advisor Dezi Abeyta, RDN, says that some key ingredients in many pre-workout supps are beta alanine, which can help to promote muscle endurance, L-arginine or L-citrulline, which can help to optimize blood flow, and of course, caffeine for extra energy. Brett Williams, Men's Health, 14 Aug. 2023 This sophisticated formula contains pure caffeine from organic green tea extract and theanine to help increase alertness, as well as beta alanine and citrulline malate for improved endurance and power output. Amber Smith, Discover Magazine, 6 Feb. 2023 The alanine content stayed the same. WIRED, 31 Jan. 2023 Three substitutions were identified: L50F (in which leucine at position 50 is substituted by phenylalanine), E166A or E166V (in which glutamic acid at position 166 is substituted by alanine or valine) and L167F (in which leucine at position 167 is substituted by phenylalanine). William A. Haseltine, Forbes, 9 June 2022 Some of the most common include caffeine, beta-alanine, and creatine. Amber Smith, Discover Magazine, 16 Nov. 2022 But their relative levels remained consistent before and after the chunks were plunged into the asteroid simulation—there was always more glycine than serine, and more serine than alanine. WIRED, 31 Jan. 2023 For example, caffeine is more potent than beta-alanine. Amber Smith, Discover Magazine, 23 Mar. 2022 The safety of beta-alanine supplementation has been well studied. Amber Smith, Discover Magazine, 12 Oct. 2022

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

Word History


German Alanin, irregular from Aldehyd aldehyde

First Known Use

1850, in the meaning defined above

Time Traveler
The first known use of alanine was in 1850

Dictionary Entries Near alanine

Cite this Entry

“Alanine.” Dictionary, Merriam-Webster, Accessed 25 May. 2024.

Kids Definition


al·​a·​nine ˈal-ə-ˌnēn How to pronounce alanine (audio)
: an amino acid formed especially by the breakdown of proteins

Medical Definition


al·​a·​nine ˈal-ə-ˌnēn How to pronounce alanine (audio)
: a simple nonessential crystalline amino acid C3H7NO2 formed especially by the hydrolysis of proteins
abbreviation Ala

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