October 2019 PMID 31623400

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.

Shinsuke Hidese, Shintaro Ogawa, Miho Ota, Ikki Ishida, Zenta Yasukawa, Makoto Ozeki, Hiroshi Kunugi

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Mentions

230
Peak: 10 in Jul 2021
across 6 sources since Oct 2019

Extended reach

690,106
potential audience

Total likes

1,256

Video views

39,287

Mentions per month

Oct 2019 – Aug 2025

Where it's discussed

  • News150 articles
  • X / Twitter56 posts
  • Blogs9 articles
  • YouTube7 videos
  • Facebook6 posts
  • Reddit2 posts

AI synopsis

What people are saying

The social discussions reflect a mostly positive outlook on the article's findings about L-theanine, with posts supporting its benefits for stress reduction and sleep improvement, using words like 'support' and 'significant,' which emphasize importance. However, some comments are cautious, noting small sample sizes and need for further validation, showing a balanced engagement with the research's potential and limitations.

AgreementModerate agreement

Most discussions agree that L-theanine has calming and cognitively beneficial effects, citing specific research findings.

InterestHigh interest

Posts show high interest, referencing multiple studies and emphasizing potential health applications and research validity.

EngagementModerate engagement

Participants delve into details of experimental results, dosages, mechanisms, and implications, indicating moderate to deep engagement.

ImpactModerate impact

While some posts highlight the positive effects, others acknowledge limitations and call for further research, suggesting modest perceived impact.

Top posts

Most liked on X and Bluesky
Mg2+ Papi, the BowTied Mg2+
@Grimhood · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial https://t.co/t1DJPU9Um0 https://t.co/Yx4caxQGqS

Jul 12, 2021 · 105 likes · 17 shares · 134,042 followers View post →
Mg2+ Papi, the BowTied Mg2+
@Grimhood · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial https://t.co/AdoxgsUP6B https://t.co/RgTcDxXNzP

Sep 27, 2023 · 87 likes · 5 shares · 134,042 followers View post →
Vitamin King | Stacks Vitamin Company
@BowTiedVitamins · X

L-theanine is an amino acid found in high concentrations in green tea & is known to have a calming effect. L-theanine helps ease stress, calm anxiety& improve mental focus. Studies show that l-theanine supplementation can improve sleep & other https://t.co/n0JvQndT5b

Mar 15, 2023 · 47 likes · 5 shares · 46,269 followers View post →
やまだ@腸活×アンチエイジング
@tarou_ymd_ · X

テアニンは、緑茶に含まれるアミノ酸で、リラックス効果やストレス軽減が報告されています。いくつかの研究で、L-テアニンがα波を増加させる(リラックス状態を促す)ことが示されており、特に急性ストレスに対する即効性が期待できます。 https://t.co/K2o4K8DbOI

Mar 21, 2025 · 8 likes · 6,209 followers View post →
Nathan M D'Cunha
@NathanMDCunha · X

Effects of L-Theanine Administration on StressRelated Symptoms and Cognitive Functions in Healthy Adults: A RCT https://t.co/MgdXknXsWi Interesting results from pre- #sleep supplementation Hat tip: @NaumovskiNenad #stress #cognition

Oct 4, 2019 · 7 likes · 5 shares · 1,478 followers View post →
Dkay
@dkayofficial_ · X

L-Theanine links to read up on the validity of statements: https://t.co/o1zQFDUeBF https://t.co/TzYYdA7O6Y https://t.co/ybG8ghMlBK https://t.co/ZDsmcWuj7B Black Seed links to read up on the validity of statements: https://t.co/54y3Wu5imM https://t.co/RHd0GCsEfW There’s

Dec 1, 2024 · 6 likes · 6,105 followers View post →

All mentions

Effects of L-Theanine on Stress and Cognitive Function

This video explores the effects of L-Theanine administration on stress-related symptoms and cognitive functions in healthy adults. It summarizes key research findings and discusses the implications for mental health and…

L214 · Jun 2, 2020 8,384 views
someone, possibly
@prayingmantis40 · X

“Papers: https://t.co/SNjV502K5l https://t.co/ZrzFKGsirM “

Aug 29, 2025 · 1 like · 80 followers View post →
やまだ@腸活×アンチエイジング
@tarou_ymd_ · X

テアニンは、緑茶に含まれるアミノ酸で、リラックス効果やストレス軽減が報告されています。いくつかの研究で、L-テアニンがα波を増加させる(リラックス状態を促す)ことが示されており、特に急性ストレスに対する即効性が期待できます。 https://t.co/K2o4K8DbOI

Mar 21, 2025 · 8 likes · 6,209 followers View post →
DoseofPharmacy
@DoseofPharmacy · X

L-Theanine may help reduce stress, improve sleep, and boost focus. Studies show it lowers stress & enhances cognition. Studies: https://t.co/5ppmpA998p https://t.co/QXvCDTgsP3 https://t.co/3CywoOBm2o

Mar 9, 2025 View post →
Sancta Wellness
@getsancta · X

@JohnConstas Great post! Research supports L-Theanine (200 mg/day) for reducing anxiety, improving sleep, and enhancing cognitive function through modulation of neurotransmitters. https://t.co/iwkx0IQgoR https://t.co/AzJKb4YpG1

Mar 8, 2025 · 2 likes · 288 followers View post →
Dkay
@dkayofficial_ · X

L-Theanine links to read up on the validity of statements: https://t.co/o1zQFDUeBF https://t.co/TzYYdA7O6Y https://t.co/ybG8ghMlBK https://t.co/ZDsmcWuj7B Black Seed links to read up on the validity of statements: https://t.co/54y3Wu5imM https://t.co/RHd0GCsEfW There’s

Dec 1, 2024 · 6 likes · 6,105 followers View post →
simply me
@simplylula · X

RT @gifaryger: @senjatanuklir Mayan nih buat baca2. Partisipan 30 org sehat (n=30). Hasil statistical significant. Tapi krn partisipannya t…

May 15, 2024 · 1 share · 39 followers View post →
Geri Santo Ramadhan
@gifaryger · X

@senjatanuklir Mayan nih buat baca2. Partisipan 30 org sehat (n=30). Hasil statistical significant. Tapi krn partisipannya tergolong dikit, generalizabilty nya masih perlu diuji lagi. Dan studi disponsori industri. https://t.co/YDAmXHgzFT https://t.co/8s5zDuoM1D

Nov 10, 2023 · 4 likes · 1 share · 248 followers View post →
Judith Haudum
@j_haudum · X

L-Theaine and #stress. "The present study suggests that L-#theanine may be a psychoactive reagent broadly useful to improve #mental health in humans." #athletes https://t.co/5Y7x1mrjpc

Oct 18, 2023 · 491 followers View post →
ManekiPink
@ManekiPink · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Sep 27, 2023 · 5 shares · 90 followers View post →
Citizen of EU
@wavetossed · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Sep 27, 2023 · 5 shares · 9,545 followers View post →
Dr Manhattan
@tha_magi · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Sep 27, 2023 · 5 shares · 1,071 followers View post →
MorpheusX
@morpheus7447x · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Sep 27, 2023 · 5 shares · 1,497 followers View post →
Mg2+ Papi, the BowTied Mg2+
@Grimhood · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial https://t.co/AdoxgsUP6B https://t.co/RgTcDxXNzP

Sep 27, 2023 · 87 likes · 5 shares · 134,042 followers View post →
JP
@Jdp227 · X

@theliverdr https://t.co/h38T3NE1sR

Sep 9, 2023 · 260 followers View post →
Real Dan Man
@Real_Dan_Man · X

RT @BowTiedVitamins: L-theanine is an amino acid found in high concentrations in green tea & is known to have a calming effect. L-theanine…

Mar 15, 2023 · 5 shares · 196 followers View post →
Buckeye089
@buckeye089 · X

RT @BowTiedVitamins: L-theanine is an amino acid found in high concentrations in green tea & is known to have a calming effect. L-theanine…

Mar 15, 2023 · 5 shares · 1,726 followers View post →
bowtied genral contractor
@BowtiedGeneral · X

RT @BowTiedVitamins: L-theanine is an amino acid found in high concentrations in green tea & is known to have a calming effect. L-theanine…

Mar 15, 2023 · 5 shares · 919 followers View post →
Snookman
@Mybjjnotes · X

RT @BowTiedVitamins: L-theanine is an amino acid found in high concentrations in green tea & is known to have a calming effect. L-theanine…

Mar 15, 2023 · 5 shares · 460 followers View post →
A Rooted Life
@TheRootCauseCo · X

RT @BowTiedVitamins: L-theanine is an amino acid found in high concentrations in green tea & is known to have a calming effect. L-theanine…

Mar 15, 2023 · 5 shares · 42,055 followers View post →
Vitamin King | Stacks Vitamin Company
@BowTiedVitamins · X

L-theanine is an amino acid found in high concentrations in green tea & is known to have a calming effect. L-theanine helps ease stress, calm anxiety& improve mental focus. Studies show that l-theanine supplementation can improve sleep & other https://t.co/n0JvQndT5b

Mar 15, 2023 · 47 likes · 5 shares · 46,269 followers View post →
Peter Tierney
@drpetertierney · X

Some supporting research for theanine: https://t.co/At5hTCyDfw https://t.co/pwIknobcMJ https://t.co/beuv8xrawY https://t.co/yrA7sncwIt https://t.co/GQUc3bzuij https://t.co/s1f6SbnoDC https://t.co/IZevlBcj0p

Dec 29, 2022 · 4 likes · 6,310 followers View post →
Assent Performance
@SteAssent · X

@muddyvee Obviously create a dark quiet environment, Glycine and l-theanine both improve sleep quality duration and reduce sleep latency https://t.co/AOWzmDxgoI https://t.co/RyzgWN52do https://t.co/Ic9pRK5jf0

Nov 18, 2022 · 1 like · 1,698 followers View post →
Realest Negus
@SpectralAnt · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial https://t.co/Qhcgg3DMjA

Nov 7, 2022 · 160 followers View post →
IF COOPER FLAGG WAS BLACK YOUD LOVE HIM
@Velli221 · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Jan 25, 2022 · 17 shares · 510 followers View post →
LongevitiSciences
@LongeviTScience · X

RT @NootropicsFocus: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults - The potent…

Sep 10, 2021 · 1 share · 82 followers View post →
Maitreya
@Mithreu · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Aug 26, 2021 · 17 shares · 1,263 followers View post →
Ahafia Communism Kills ⚡️
@Ahafia2 · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Aug 26, 2021 · 17 shares · 14,704 followers View post →
A Rooted Life
@TheRootCauseCo · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Aug 25, 2021 · 17 shares · 42,055 followers View post →
Mg2+ Papi, the BowTied Mg2+
@Grimhood · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Aug 25, 2021 · 17 shares · 134,042 followers View post →
moe sizlack
@LukeJen13031247 · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Jul 13, 2021 · 17 shares · 24 followers View post →
R.L. Trine
@LI8HTS · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Jul 12, 2021 · 17 shares · 228 followers View post →
Geri
@Shnooping · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Jul 12, 2021 · 17 shares · 723 followers View post →
officialseanj
@officialseanj · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Jul 12, 2021 · 17 shares · 1,138 followers View post →
Aureliano Buendia
@Fredridiculous · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Jul 12, 2021 · 17 shares · 107 followers View post →
Sophia Koltavary
@holypaprika23 · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Jul 12, 2021 · 17 shares · 220 followers View post →
Roth
@RothGelen · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Jul 12, 2021 · 17 shares · 257 followers View post →
GENERAL AMERICA
@hawkeyeEcho · X

RT @Grimhood: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Contr…

Jul 12, 2021 · 17 shares · 2,218 followers View post →
Mg2+ Papi, the BowTied Mg2+
@Grimhood · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial https://t.co/t1DJPU9Um0 https://t.co/Yx4caxQGqS

Jul 12, 2021 · 105 likes · 17 shares · 134,042 followers View post →
NootropicReddit
@NootropicReddit · X

Nutrients | Free Full-Text | Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial (2019) via /r/Nootropics https://t.co/AUynlGWLV6

Jul 6, 2021 · 790 followers View post →
Nootropics Focus
@NootropicsFocus · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults - The potential to promote mental health in the general population with stress-related ailments and cognitive impairments: https://t.co/oZSx0TaF1f

May 25, 2021 · 6 likes · 1 share · 348 followers View post →
L ☀️ Q
@numloq · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial https://t.co/52Pwtdem0K

Apr 6, 2021 · 2,928 followers View post →
Psychic_Brian
@PsychicBrianX · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Random… https://t.co/24aY51MRUF

Jan 18, 2021 · 5,181 followers View post →
Yazeed
@flexyazeed · X

مرجع: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Tria https://t.co/LVpvT47QAD

Sep 14, 2020 · 153 followers View post →
Mikki Williden PhD
@MikkiWilliden · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Random… https://t.co/v7RMxmBkNk

Jul 12, 2020 · 1 like · 2,241 followers View post →
Hellen C. Greenblatt
@HellenGreenblat · X

Green #tea amino acid (200mg/day) → #stress ↓, #sleep ↑, #verbal fluency and #executive functions ↑ ? n=30 Randomized, placebo-controlled, crossover, and double-blind trial . https://t.co/azDSBWvI6X [open access].

Dec 4, 2019 · 4,433 followers View post →
NootropicReddit
@NootropicReddit · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial via /r/Nootropics https://t.co/fL8c9aP4pS

Nov 17, 2019 · 790 followers View post →
Pooja
@pm_girl · X

#Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial. - PubMed https://t.co/SKHHjmENMs #science

Nov 6, 2019 · 2,069 followers View post →
New Scientist Zone
@NewScientistZon · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial. - PubMed https://t.co/HwhXDth1Ez

Nov 6, 2019 · 178 followers View post →
Brain Updates ⚡️
@brainupdates · X

L-theanine (200 mg/day) enhances verbal intelligence, sleep, and betters stress and depression in healthy adults, reveals new japanese study by NCNP / Hiroshi Kunugi (https://t.co/iH2ncPIlfQ). [L-theanine is found in green tea] study: https://t.co/T9gJjpNTK4 #greentea #nootropics https://t.co/CkPwZahePg

Oct 25, 2019 · 1 like · 4,743 followers View post →
NootropicReddit
@NootropicReddit · X

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.2019 via /r/Nootropics https://t.co/udkxP3kFk8

Oct 24, 2019 · 1 like · 790 followers View post →
nutradian
@nutradian · X

Effects of #LTheanine Administration on #Stress Related Symptoms and #Cognitive Functions in Healthy Adults: A Randomized Controlled Trial https://t.co/p67ZuO6Gio #RCT

Oct 9, 2019 · 1 followers View post →
Deborah Gordon, M.D.
@DrDeborahMD · X

RT @NathanMDCunha: Effects of L-Theanine Administration on StressRelated Symptoms and Cognitive Functions in Healthy Adults: A RCT https://…

Oct 5, 2019 · 5 shares · 3,748 followers View post →
Juhana Harju
@JuhanaHarju · X

RT @NathanMDCunha: Effects of L-Theanine Administration on StressRelated Symptoms and Cognitive Functions in Healthy Adults: A RCT https://…

Oct 5, 2019 · 5 shares · 1,690 followers View post →
J P Fanton
@HealthyFellow · X

RT @NathanMDCunha: Effects of L-Theanine Administration on StressRelated Symptoms and Cognitive Functions in Healthy Adults: A RCT https://…

Oct 5, 2019 · 5 shares · 26,022 followers View post →
Prof Nenad Naumovski (PhD)
@NaumovskiNenad · X

RT @NathanMDCunha: Effects of L-Theanine Administration on StressRelated Symptoms and Cognitive Functions in Healthy Adults: A RCT https://…

Oct 4, 2019 · 5 shares · 1,224 followers View post →
Nathan M D'Cunha
@NathanMDCunha · X

Effects of L-Theanine Administration on StressRelated Symptoms and Cognitive Functions in Healthy Adults: A RCT https://t.co/MgdXknXsWi Interesting results from pre- #sleep supplementation Hat tip: @NaumovskiNenad #stress #cognition

Oct 4, 2019 · 7 likes · 5 shares · 1,478 followers View post →