Nutr Neurosci August 2008 PMID 18681988

The combined effects of L-theanine and caffeine on cognitive performance and mood.

Gail N Owen, Holly Parnell, Eveline A De Bruin, Jane A Rycroft

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Peak: 20 in Feb 2022

across 7 sources since May 2019

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AI synopsis

What people are saying

Several discussions highlight personal experiences with combining L-theanine and caffeine, such as users stating it helps reduce jitters and improve focus. Phrases like 'game changer' and 'real solution' were used to express strong support for the combination's effects. This choice of language showcases excitement and indicates that contributors find the idea both captivating and impactful, further fueling their interest in the potential benefits.

AgreementStrong agreement

The discussions consistently support the findings of the article, echoing claims that L-theanine enhances the benefits of caffeine.

InterestHigh interest

Contributors demonstrate a high level of curiosity about the L-theanine and caffeine combination, often sharing personal experiences and prompting further exploration.

EngagementModerate engagement

Many posts contain references to research or personal anecdotes, suggesting moderate engagement rather than passive consumption.

ImpactHigh impact

Participants in the discussions generally believe that the findings could lead to significant improvements in cognitive performance and mood.

Abstract in brief

The study examined the effects of 50 mg caffeine alone and with 100 mg L-theanine on cognitive performance and mood in 27 healthy volunteers.
At 60 minutes, caffeine increased subjective alertness, while the combination of caffeine and L-theanine enhanced both speed and accuracy on attention-switching tasks, reducing distractions in memory tasks.
These findings support earlier research that indicates L-theanine and caffeine together can improve performance on challenging cognitive tasks.

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All mentions

Optimized Morning Routine for Enhanced Cognitive Performance

This video discusses a morning routine designed to boost alertness and focus, including the use of light therapy and skincare. It highlights scientific evidence showing that combining L-theanine and caffeine improves…

The Science of Self-Care · Oct 5, 2023 44,034 views

Exploring Matcha: Cognitive Benefits of L-theanine and Caffeine

This video showcases the journey to uncover what makes matcha exceptional, focusing on the cognitive benefits of its components. It highlights the combined effects of caffeine and L-theanine in enhancing cognitive…

The Science of Self-Care · May 3, 2024 22,631 views

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Maternal choline supplementation during the third trimester can enhance infant cognitive abilities, specifically improving information processing speed. The study found that infants whose mothers consumed approximately…

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Effects of Caffeine and L-theanine on Cognitive Performance

This video explores a study on the effects of caffeine and L-theanine on cognitive performance and mood in healthy volunteers. Findings indicate that the combination enhances speed and accuracy on attention tasks while…

健康の雑学 · Sep 14, 2025 8,219 views

Enhancing Cognitive Performance with L-Theanine and Caffeine

Discover how L-theanine can complement caffeine to reduce discomfort and enhance cognitive performance. This video explores the benefits of combining these compounds for improved alertness and focus, revealing a…

The Science of Self-Care · May 28, 2019 2,174 views

elixur IQ improvement technology

@momomomo5700 · X

https://t.co/Q6GbAvFsfN

Sep 14, 2025 · 41 followers View post →

chief kyiv

@stefanivan.com · Bluesky

have you tried having L-theanine with coffee? It's the amino acid in tea (but not coffee) that moderates caffeine shakiness/overstimulation. pubmed.ncbi.nlm.nih.gov/18681988/

May 23, 2025 · 1 like · 1 share View post →

Alexander Stahl

@AStahlTCH · X

L-theanine + caffeine is a research-backed cognitive enhancer. 200mg L-theanine with your morning coffee provides focus without jitters. #Biohacking #FocusStack Source: Nutritional Neuroscience, "The combined effects of L-theanine and caffeine" (2008) - https://t.co/WBQQsAKvQ3

Apr 30, 2025 · 92 followers View post →

Tom Quick

@realtomquick · X

@isabelleboemeke If you're not taking l-theanine with your caffeine, you're only hurting yourself. https://t.co/Ww6FGXdpUE

Sep 24, 2024 · 1 like · 336 followers View post →

DoctorDueDiligence

@DueDoctor · X

@pdhsu Tangent (and limited evidence) but some report longer focus and attention, less downside effects, when combining l-theanine with caffeine. It is an AA naturally found in green tea, black tea, and some mushrooms. https://t.co/cEWTLADC04

Aug 19, 2024 · 1 like · 9,428 followers View post →

My Tea Connection

@MyTeaConnection · X

Tea Study 87/100, Improve attention and focus with tea! #tea #scientificresearch #ltheanine #caffeine Study: https://t.co/IvBx8Agz9r Music:“Mysterious Passenger”By Purrple Cat Music:“Drone Flight, Chillstep & Abstact Music" By Top Flow Production https://t.co/J6J7W7kHqJ https://t.co/wfBcswX5jP

Aug 6, 2024 · 3 likes · 740 followers View post →

reissbaker

@reissbaker · X

@ParamMoon @alth0u it's also just a better combination! l-theanine+caffeine improves performance more than caffeine alone https://t.co/FWYSNOFep2

Jun 27, 2024 · 3 likes · 909 followers View post →

no grasper

@nograsper · X

@sellieyoung L-theanine https://t.co/vFOYibqNdm Probably benzos and a beta blocker for actual overdose

Mar 28, 2024 · 1 like · 1,002 followers View post →

World of Supplements

@WorldOfBiohack · X

https://t.co/lxtNqe846e https://t.co/PUbcjYfaVU https://t.co/BL2QbRWGQr https://t.co/oYzQGbwnBQ

Nov 18, 2023 · 1 like · 40 followers View post →

Burny - Effective Curiosity

@burny_tech · X

RT @Dantheman0207: @movebettersam @m_ashcroft @johnsonmxe Drinking green tea together with coffee was the solution for me. L-theanine binds…

Sep 20, 2023 · 1 share · 19,139 followers View post →

Daniel

@Dantheman0207 · X

@movebettersam @m_ashcroft @johnsonmxe Drinking green tea together with coffee was the solution for me. L-theanine binds to caffeine to lengthen half life and slow down uptake. It flattens the curve so you get a smoother come up and no crash. The effect is milder but lasts longer and is nicer. https://t.co/Pm6ECWSKom

Sep 20, 2023 · 6 likes · 1 share · 332 followers View post →

nws

@NeastWS · X

@opinonhaver https://t.co/lPkYEfM96W https://t.co/9N3vObeYcn

Sep 19, 2023 · 4 likes · 623 followers View post →

Vitalholis

@vitalholis · X

Sep 7, 2023 · 9 likes · 19,149 followers View post →

chreke

@therealchreke · X

@seltzergenius @paularambles While I question the accuracy of that graph (caffeine has a half-life of about 2-10 hours depending on metabolism, so there should be no sudden “drop”), studies indicate that combining L-Theanine with caffeine (as in matcha) has positive effects: https://t.co/56Zep5f2wK

Aug 24, 2023 · 5 likes · 721 followers View post →

Robbiespierre

@XPElixir · X

Caffeine has been thoroughly proven to help with cognitive performance, but it's got side effects. Taking L-Theanine has been studied as a good way to counteract them. https://t.co/Hzoajttunw

May 30, 2023 · 6 followers View post →

Murphy Arana

@AranaMurphy · X

@sci_shark I suggesting adding L-theanine, reduces jitter, has additional benefits, 'smart' energy so to speak https://t.co/U9iuDHVko2

May 11, 2023 · 1 like · 33 followers View post →

Rich Burroughs

@richburroughs.dev · Bluesky

Oh wow I didn’t know about this but did some googling and found a study that backs it up. https://pubmed.ncbi.nlm.nih.gov/18681988/

May 11, 2023 · 6 likes · 2 shares View post →

Flashlight_Eyes

@HundWilliams · X

Study showing combination of caffeine and L-Theanine led to increased cognitive performance in demanding tasks https://t.co/OPoSdCuXLa

Apr 10, 2023 · 1 like · 241 followers View post →

Sex & the Queer Christian

@sexqchristian · X

@JawnTheBeloved @nobrysta Have you heard anything good about combining caffeine with theanine? I might give it a try. https://t.co/oUksXYDZDw

Mar 30, 2023 · 187 followers View post →

Sergey

@serega_ton · X

Besides caffeine tea also includes L-theanine

Mar 14, 2023 · 963 followers View post →

Sol

@empireDuSol · X

El día de hoy descubrimo que Twitter es adicto a la cafeina XD. Aqui un estudio. https://t.co/xqVqExGs6b Les hyper recomiendo ese combo. Intentenlo si tienen un proyecto de software, o quieren ver como les va en el trading

Mar 1, 2023 · 2 likes · 911 followers View post →

@fascondo · X

@solemncat @AlKharidie I use caffeine pills by Natural Stacks that have L-theanine in it in a 1:2 ratio because I can’t stand the taste of coffee. Real game changer https://t.co/pNuz01Sy5r

Feb 7, 2023 · 1 like · 751 followers View post →

Brandon Beery

@NDominator · X

@DannyLeibrandt There's research behind the combo for mood and cognitive performance. Instead of drinking tea you can supplement the same combo. https://t.co/Myjvelxqz4

Jan 30, 2023 · 2,917 followers View post →

SGIR

@samgetitright · X

https://t.co/cjLaAGCV9S

Jan 22, 2023 · 3 likes · 72,430 followers View post →

Mike Conover

@vagabondjack · X

Jan 12, 2023 · 12 likes · 4,115 followers View post →

beeboo

@DJ_WIFL · X

@TRHLofficial For an extra cognitive bonus, try coffee & L-Theanine. https://t.co/8ZGoLBI7zI

Jan 7, 2023 · 54 followers View post →

Brady Kelly

@bradykelly · X

[1/3] There certainly are. "L-theanine & caffeine combination improved both speed and accuracy of performance of attention-switching task at 60 min, and reduced susceptibility to distracting information in memory task at both 60 min & 90 min." - https://t.co/qDVeZ0kzSG https://t.co/ordhb2Q0Yr

Dec 27, 2022 · 1,148 followers View post →

Lean Achilles | Men's Fitness

@LeanAchilles · X

RT @LeanAchilles: @jackmoses0 @CenterHps The synergy of l-theanine & caffeine is elite ⚡️ L-theanine is a nootropic, and when consumed wit…

Dec 9, 2022 · 1 share · 263 followers View post →

Lean Achilles | Men's Fitness

@LeanAchilles · X

@jackmoses0 @CenterHps The synergy of l-theanine & caffeine is elite ⚡️ L-theanine is a nootropic, and when consumed with caffeine studies show it can boost cognitive performance Also makes the energy from caffeine a bit “smoother,” no spike and crash https://t.co/VWIUPnu2ib

Dec 8, 2022 · 3 likes · 1 share · 263 followers View post →

kike

@FUENTESMANZULLI · X

RT @JohnConstas: A coffee and L-Theanine mixed together were shown to enhance the speed and accuracy of attention switching tasks And made…

Nov 10, 2022 · 3 shares · 249 followers View post →

Kathryn

@Real_KthrynBrwn · X

RT @JohnConstas: A coffee and L-Theanine mixed together were shown to enhance the speed and accuracy of attention switching tasks And made…

Nov 10, 2022 · 3 shares · 524 followers View post →

John Constas

@JohnConstas · X

A coffee and L-Theanine mixed together were shown to enhance the speed and accuracy of attention switching tasks And made you less distracted https://t.co/S74PcQFkbZ.

Nov 9, 2022 · 39 likes · 3 shares · 145,061 followers View post →

Spike Brehm

@spikebrehm · X

@Joelbdenning Take some L-theanine with your coffee and it greatly helps the anxiety + jitters! I do every day https://t.co/Hp4Lk1YWvH

Oct 9, 2022 · 1 like · 10,677 followers View post →

Jordan Borth

@jordanborth · X

@_scottgarcia @hubermanlab Take L-Theanine with your coffee https://t.co/DmlelQt5CP

Sep 15, 2022 · 1,509 followers View post →

The Crypto Dog

@TheCryptoDog · X

@mcdiarmid22 This isn't a particularly large study but it jives with everything else I've read and I am too hungry right now to search for something better. The conclusion is

Aug 14, 2022 · 2 likes · 859,065 followers View post →

Tony Snark

@t_snark · X

@VitalikButerin @Fiskantes @TheCryptoDog Caffeine gets moderated by L-theanine in Matcha with some synergistic effects. https://t.co/YZGqgq5tgh

Aug 1, 2022 · 5 likes · 6,491 followers View post →

Corvaie

@Corvaiex · X

@eigenrobot Try l-theanine in combination with caffeine. It's not gonna be anywhere near as powerful as adderall but it does good work in sharpening focus for me. https://t.co/8iZRWLDoxH

Jul 8, 2022 · 1 like · 798 followers View post →

JWM Fischer

@JWMFischer · X

@kairyssdal Coffee with L-Theanine. It’s a thing. https://t.co/8aNunKQj5O

Jun 30, 2022 · 1 like · 505 followers View post →

Faited

@faited_ · X

@gal_la_mode https://t.co/gigdjrhSgi

May 19, 2022 · 1 like · 714 followers View post →

JC Bird

@ItsBirdyBaby · X

@hubermanlab Citations: Gail N. Owen, Holly Parnell, Eveline A. De Bruin & Jane A. Rycroft (2008) The combined effects of L-theanine and caffeine on cognitive performance and mood, Nutritional Neuroscience, 11:4, 193-198, DOI: 10.1179/147683008X301513

May 11, 2022 · 948 followers View post →

Kabbala Heiress

@brodakii · X

@OldMemeClown Take L-theanine. It has a synergistic effect with caffeine and conveniently takes away the anxiety https://t.co/XeQExsn4fg

Apr 20, 2022 · 454 followers View post →

Lene Elisabeth Eide

@LeneEEide · X

@mcellingsen @prokrastinerer Drikker du kaffe? Ta L-teanin med kaffen din. https://t.co/mJUc00WVBs

Apr 5, 2022 · 1 like · 1,351 followers View post →

Mike Lucchesi

@MichaelLucchesi · X

@joeyyochheim Fat in the AM has been great for me I had an extremely hyperactive mind in my early 20s & experimented with creating my own stack of nootropics L-theanine & caffeine (2:1 ratio) w/ good fat has been life changing for my mental clarity & ability to focus https://t.co/Pe8luGOmTe

Mar 1, 2022 · 2 likes · 1,144 followers View post →

Calum Boal

@CalumBoal · X

@d0nutptr @DanielMiessler https://t.co/2L510yGm9t

Feb 10, 2022 · 1 like · 3,483 followers View post →

JoePavlik

@JoePavlik · X

@TheJimHook https://t.co/b8IH0qwlPC

Feb 2, 2022 · 6,455 followers View post →

David Wade

@DavidWa56772353 · X