How to Use theanine in a Sentence

theanine

noun
  • Green tea is known for its high theanine and catechin content.
    — Amy Brownstein, Verywell Health, 4 Mar. 2026
  • What's more, green tea contains L-theanine, a type of amino acid, per Allen.
    — Kirsten Nunez, Martha Stewart, 12 May 2026
  • Matcha is also loaded with l-theanine, an amino acid found in black tea, green tea, and mushrooms.
    — Ola Faleti, chicagotribune.com, 17 Apr. 2021
  • This dreamy blend includes 3 grams of melatonin along with L-theanine, chamomile and lemon balm.
    — Bestreviews, Chicago Tribune, 8 May 2026
  • Green tea has caffeine and L-theanine (an amino acid), both of which improve alertness.
    — Merve Ceylan, Health, 21 June 2026
  • Green tea has caffeine and L-theanine (an amino acid), both of which improve alertness.
    — Merve Ceylan, Health, 3 Feb. 2026
  • That said, research on L-theanine in children is still limited.
    — Allison Palmer, Sacbee.com, 23 Apr. 2026
  • Chai has less caffeine and provides L-theanine for a steadier rise in energy.
    — Brandi Jones, Health, 6 Feb. 2026
  • Avoid taking l-theanine while pregnant or breastfeeding.
    — T'keyah Bazin, Verywell Health, 4 Feb. 2026
  • Green tea is a source of the amino acid of the amino acid L-theanine, a compound that's linked to alertness and mood-enhancement.
    — Zee Krstic, Good Housekeeping, 6 Jan. 2020
  • Cinnamon can help control blood sugar and theanine and caffeine in chai tea can help to keep us focused during the day.
    — Lisa Drayer, CNN, 14 Dec. 2021
  • If your sleep trouble is structural or severe, L-theanine alone probably won’t be enough.
    — Allison Palmer, Charlotte Observer, 23 Apr. 2026
  • Our caffeine-free mixture of chromium, seaweed extract + L-theanine does the trick.
    — Amber Smith, Discover Magazine, 3 Dec. 2022
  • There are different levels of L-theanine depending on which type of true tea is consumed.
    — Sudiksha Kochi, USA TODAY, 19 June 2021
  • There is no specific dosage recommendation for l-theanine for brain health.
    — Megan Nunn, Verywell Health, 3 Mar. 2026
  • Green and black tea are rich in anti-aging polyphenols and contain theanine, an amino acid that promotes relaxation.
    — Lisa Drayer, CNN, 14 Mar. 2022
  • One is an amino acid only found in tea, called l-theanine, which in the last decade has been added to drinks that promote focus and concentration.
    — Ben Guarino, The Denver Post, 2 May 2017
  • Many menopause supplements contain black cohosh, maca root powder, and L-theanine.
    — Stephanie Brown, Verywell Health, 29 Apr. 2026
  • Matcha provides a more calming energy than coffee due to its L-theanine content.
    — Jillian Kubala, Health, 30 Jan. 2026
  • Also, consider mixing magnesium with L-theanine, which can help calm you down even more.
    — Sohaib Imtiaz, Verywell Health, 27 Oct. 2025
  • Suntheanine is a form of L-theanine that helps promote relaxation without any drowsiness.
    — Andrea Navarro, Travel + Leisure, 17 Mar. 2021
  • Into that gap steps L-theanine, a natural sleep aid that’s been quietly building a case in the research.
    — Allison Palmer, Kansas City Star, 23 Apr. 2026
  • Matcha is a powdered form of green tea with a smooth, earthy flavor and a more sustained energy release thanks to L-theanine, an amino acid.
    — Sohaib Imtiaz, Verywell Health, 20 Jan. 2026
  • Matcha is a powdered form of green tea with a smooth, earthy flavor and a more sustained energy release thanks to L-theanine, an amino acid.
    — Lauren Panoff, Verywell Health, 4 Sep. 2025
  • Pepsi chose to use l-theanine, a workhorse ingredient in relaxation drinks.
    — Elizabeth Lopatto, The Verge, 13 Jan. 2021
  • Increasing the time tea steeps increases the amount of caffeine and other components like theanine.
    — Brittany Lubeck, Verywell Health, 22 Oct. 2025
  • That’s the logic behind Zeno’s formula, as L-theanine is proven to enhance focus and calm.
    — Benjamin Adams, Forbes, 10 Sep. 2021
  • Some drinks, like coffee and tea, naturally contain compounds such as caffeine and L-theanine.
    — Merve Ceylan, Health, 1 June 2026
  • Common nootropics in mocktails include l-theanine, lion’s mane mushroom, lemon balm and ginkgo biloba.
    — Lauren Schuster, Miami Herald, 27 May 2026
  • It is also known for having L-theanine, which can help reduce the risk of Alzheimer's or Parkinson's disease.
    — Sudiksha Kochi, USA TODAY, 19 June 2021

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

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