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L-Theanine

Integrative Therapeutics
4.7
★ ★ ★ ★ ★
(54 ratings)
Theanine 100 mg
Product Image
Score75
A useful 100 mg L-theanine serving offers focused relaxation, but likely requires two capsules. Generic sourcing and weak comparative value limit its appeal.
How scoring works
Quantity:60 Capsule(s) • (30 servings)
Goals:
Stress Relief
Mental Focus
Cognitive Support
Sleep Support
Mood Support
Brain Health
Productivity Boost

Score 75

A useful 100 mg L-theanine serving offers focused relaxation, but likely requires two capsules. Generic sourcing and weak comparative value limit its appeal.
How scoring works
$22.00($0.73 per serving)
Pure Formulas
$ 22.00
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Analysis

A single serving supplies 100 mg of L-theanine in a simple, focused capsule. That amount can support calm attention and acute relaxation without acting as a stimulant.

The product fits situational stress or mild pre-sleep mental tension better than broad brain, mood, or productivity goals. It does not address memory, brain energy, circadian timing, or wider stress-adaptation pathways.

The bottle data indicate two capsules per serving, reducing convenience relative to one-capsule alternatives. No branded source or purity standard is supplied, and comparative value is weak.

Who is it for
  • Adults seeking a moderate L-theanine amount
  • People focused on situational relaxation
  • Users comfortable taking two capsules
Best for
  • Mild stress relief
  • Calm attention
  • Relaxation before bed

Pros

  • Useful 100 mg amount
  • Simple single-active formula
  • Clearly stated serving amount

Cons

  • Likely two capsules per serving
  • No branded-source assurance
  • Weak comparative value
  • Narrow pathway coverage

Nutrient quality

90 Highest impact

L-theanine is a defined amino acid, although no branded source or purity marker is supplied. The L-theanine amount is practical for moderate daily support.

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Ingredient transparency

81 Highest impact

Every supplied active ingredient has a specific amount. No proprietary blend hides a meaningful active dose.

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Customer satisfaction

58 Moderate impact

The supplied aggregate rating is strong, although no specific comments are included. The limited rating count reduces confidence in the aggregate result.

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Value for money

64 Moderate impact

Formula quality provides strong support for the product positioning. Dose-adjusted serving value appears weak, while the formula avoids obvious low-value padding.

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Report analysis

Goals

Stress Relief
Impact
Highest effect
A Goal FitA- Strength of SupportC- CoverageA+ Formula Quality
Theanine · 100 mg

L-theanine directly supports calm attention without relying on sedation. The disclosed amount sits in a useful range for acute mental stress.

The active L-isomer is clearly identified, although no branded source or purity testing is provided. The focused capsule has strong depth for one neurotransmitter pathway but does not address mineral or adaptogen support.

Study evidence
Theanine Supportive 16 studies
Mental Focus
Impact
High effect
B Goal FitB+ Strength of SupportD+ CoverageA Formula Quality
Theanine · 100 mg

A simple L-theanine serving may support calm attention, especially when paired with caffeine from another source. The amount falls within a commonly used range, though stand-alone effects on focus are less reliable.

Clear single-ingredient disclosure makes the capsule easy to assess. The label does not identify a branded source or purity testing, but there are no distracting active ingredients.

Study evidence
Theanine Supportive 19 studies
Cognitive Support
Impact
High effect
B Goal FitB+ Strength of SupportD+ CoverageA Formula Quality
Theanine · 100 mg

L-theanine is directly relevant to calm attention and stress-sensitive focus. The clearly disclosed amount sits in a commonly useful range and gives the simple capsule meaningful depth for one pathway.

Generic sourcing lacks branded purity assurance, and the formula does not address memory, circulation, brain energy, or neurotransmitter precursors. It remains a focused calming option rather than broad cognitive support.

Study evidence
Theanine Supportive 25 studies
Sleep Support
Impact
High effect
C+ Goal FitB+ Strength of SupportC CoverageA+ Formula Quality
Theanine · 100 mg

L-theanine offers a focused, non-sedating route to relaxation that may help users unwind before bed. The 100 mg amount is useful but below the stronger range used by some sleep formulas.

The single-active capsule is easy to assess and contains no conflicting stimulant. It lacks circadian or mineral support, so the benefit is limited to relaxation.

Study evidence
Theanine Supportive 8 studies
Mood Support
Impact
High effect
C Goal FitB- Strength of SupportC CoverageA+ Formula Quality

A clear 100 mg L-theanine amount may support calm and reduce stress-related tension. The single-ingredient capsule is easy to evaluate and avoids unnecessary additions.

The amount is useful but below the strongest common range, and the source has no branded purity assurance. A single calming pathway does not address neurotransmitter precursors, stress adaptation, or structural brain support.

Study evidence
Theanine Supportive 12 studies
Brain Health
Impact
High effect
C+ Goal FitB Strength of SupportD+ CoverageA Formula Quality

A single clearly disclosed L-theanine ingredient offers focused support for calm attention and stress management. Its evidence is relevant but narrower than ingredients that directly support memory or neuronal structure.

The amount is well aligned with common use, and the simple capsule makes the formula easy to assess. No branded source or purity detail is provided, but there is no unnecessary padding.

Study evidence
Theanine Supportive 17 studies
Productivity Boost
Impact
High effect
C+ Goal FitB- Strength of SupportD CoverageA- Formula Quality
Theanine · 100 mg

A clearly disclosed 100 mg L-theanine amount may support calm concentration without adding stimulant exposure. The amount is useful but below the stronger 200 mg level commonly used for focused support.

The single-ingredient capsule is transparent and avoids unnecessary additions. Effects are likely subtle without caffeine or another alertness active.

Study evidence
Theanine Supportive 5 studies

Ingredients

IngredientAmount per serving
L-Theanine
100 mg
Gluten Free Adults 18–50 Vegan Dairy Free Vegetarian
Report overview
Theanine · 100 mg OverallScore76
B+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyF Value

Explicit L-theanine identity confirms the active isomer, but no branded source or purity testing is shown. The clearly disclosed amount falls within the optimal range for calm and focused support. The simple capsule is easy to assess, though it carries no premium purity claim.

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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic Review.
    Williams JL; Everett JM; D'Cunha NM; Sergi D; Georgousopoulou EN; Keegan RJ; McKune AJ; Mellor DD; Anstice N; Naumovski N · Plant foods for human nutrition (Dordrecht, Netherlands) · 2020
    Systematic review9 studies pooledStress Relief Mood Support forTheanine
  2. A Randomized, Triple-Blind, Placebo-Controlled, Crossover Study to Investigate the Efficacy of a Single Dose of AlphaWave® L-Theanine on Stress in a Healthy Adult Population.
    Evans M; McDonald AC; Xiong L; Crowley DC; Guthrie N · Neurology and therapy · 2021
    Randomized trialStress Relief Brain Health forTheanine
  3. L-theanine in the adjunctive treatment of generalized anxiety disorder: A double-blind, randomised, placebo-controlled trial.
    Sarris J; Byrne GJ; Cribb L; Oliver G; Murphy J; Macdonald P; Nazareth S; Karamacoska D; Galea S; Short A; Ee C; Birling Y; Menon R; Ng CH · Journal of psychiatric research · 2020
    Randomized trial46 participantsStress Relief Sleep Support forTheanine
  4. Safety and Efficacy of AlphaWave® L-Theanine Supplementation for 28 Days in Healthy Adults with Moderate Stress: A Randomized, Double-Blind, Placebo-Controlled Trial.
    Moulin M; Crowley DC; Xiong L; Guthrie N; Lewis ED · Neurology and therapy · 2024
    Randomized trial30 participantsStress Relief Mental Focus Productivity Boost forTheanine
  5. Promising, but Not Completely Conclusive-The Effect of l-Theanine on Cognitive Performance Based on the Systematic Review and Meta-Analysis of Randomized Placebo-Controlled Clinical Trials.
    Mátyus RO; Szikora Z; Bodó D; Vargáné Szabó B; Csupor É; Csupor D; Tóth B · Journal of clinical medicine · 2025
    Meta-analysis148 participants5 studies pooledMental Focus forTheanine
  6. Effects of l-Theanine on Cognitive Function in Middle-Aged and Older Subjects: A Randomized Placebo-Controlled Study.
    Baba Y; Inagaki S; Nakagawa S; Kaneko T; Kobayashi M; Takihara T · Journal of medicinal food · 2021
    Randomized trialMental Focus Brain Health Productivity Boost forTheanine
  7. Time for tea: mood, blood pressure and cognitive performance effects of caffeine and theanine administered alone and together.
    Rogers PJ; Smith JE; Heatherley SV; Pleydell-Pearce CW · Psychopharmacology · 2008
    Randomized trial48 participantsMental Focus Productivity Boost forTheanine
  8. Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.
    Hidese S; Ogawa S; Ota M; Ishida I; Yasukawa Z; Ozeki M; Kunugi H · Nutrients · 2020
    Randomized trial30 participantsBrain Health Cognitive Support Sleep Support forTheanine
  9. Effects of Tea (Camellia sinensis) or its Bioactive Compounds l-Theanine or l-Theanine plus Caffeine on Cognition, Sleep, and Mood in Healthy Participants: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.
    Payne ER; Aceves-Martins M; Dubost J; Greyling A; de Roos B · Nutrition reviews · 2025
    Meta-analysis50 studies pooledBrain Health Cognitive Support Mental Focus forTheanine
  10. Assessing the effects of caffeine and theanine on the maintenance of vigilance during a sustained attention task.
    Foxe JJ; Morie KP; Laud PJ; Rowson MJ; de Bruin EA; Kelly SP · Neuropharmacology · 2012
    Randomized trial27 participantsBrain Health Cognitive Support forTheanine
  11. Dose-response effect of L-theanine on psychomotor speed, sustained attention, and inhibitory control: a double-blind, placebo-controlled, crossover study.
    Dassanayake TL; Wijesundara D; Kahathuduwa CN; Weerasinghe VS · Nutritional neuroscience · 2023
    Randomized trial32 participantsCognitive Support forTheanine
  12. Acute effects of theanine, caffeine and theanine-caffeine combination on attention.
    Kahathuduwa CN; Dassanayake TL; Amarakoon AMT; Weerasinghe VS · Nutritional neuroscience · 2018
    Clinical trial20 participantsCognitive Support Mental Focus forTheanine
  13. Effect of L-theanine on selective attention in a traffic-related reaction task in sleep-deprived young adults: a double-blind placebo-controlled, crossover study.
    Karunaratne UW; Dassanayake TL · Nutritional neuroscience · 2025
    Randomized trial24 participantsMental Focus forTheanine
  14. l-theanine adjunct to sertraline for major depressive disorder: A randomized, double-blind, placebo-controlled clinical trial.
    Shamabadi A; Kafi F; Arab Bafrani M; Asadigandomani H; A Basti F; Akhondzadeh S · Journal of affective disorders · 2023
    Randomized trial60 participantsMood Support forTheanine
  15. L-theanine relieves positive, activation, and anxiety symptoms in patients with schizophrenia and schizoaffective disorder: an 8-week, randomized, double-blind, placebo-controlled, 2-center study.
    Ritsner MS; Miodownik C; Ratner Y; Shleifer T; Mar M; Pintov L; Lerner V · The Journal of clinical psychiatry · 2011
    Randomized trial60 participantsMood Support Stress Relief forTheanine
  16. Comparison of the effects of two amino acids, Gamma-aminobutyric acid (GABA) and L-theanine, on sedation, anxiety, and cognition in preoperative surgical patients - A randomized controlled study.
    Deshpande SS; Kurdi M; Baiju A; Athira AS; Sarasamma AG; Gangadharan AK · Journal of anaesthesiology, clinical pharmacology · 2025
    Randomized trial168 participantsMood Support Stress Relief forTheanine
  17. Anti-stress effect of theanine on students during pharmacy practice: positive correlation among salivary α-amylase activity, trait anxiety and subjective stress.
    Unno K; Tanida N; Ishii N; Yamamoto H; Iguchi K; Hoshino M; Takeda A; Ozawa H; Ohkubo T; Juneja LR; Yamada H · Pharmacology, biochemistry, and behavior · 2014
    Randomized trial20 participantsMood Support forTheanine
  18. Cognitive and affective effects of L-Theanine: a systematic review and meta-analysis of 31 randomized trials.
    Gerolymos C; Saddier E; Boyer L; Fond G · Molecular psychiatry · 2026
    Meta-analysis1,168 participants31 studies pooledProductivity Boost forTheanine
  19. Effects of L-theanine on cognition, mood and sleep: evidence from human trials.
    Cotter J; Kilpatrick HE · Frontiers in nutrition · 2026
    Narrative reviewProductivity Boost forTheanine
  20. Comparison Between Efficacy of Oral Melatonin and Oral L-theanine in Improving Sleep in Cancer Patients Suffering From Insomnia: A Randomised Double-blinded Placebo-controlled Study.
    Kurdi MS; As A; Ladhad DA; Mitragotri MV; Baiju A · Indian journal of palliative care · 2024
    Randomized trial120 participantsSleep Support forTheanine
  21. The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis.
    Bulman A; D'Cunha NM; Marx W; Turner M; McKune A; Naumovski N · Sleep medicine reviews · 2025
    Meta-analysis897 participants19 studies pooledSleep Support forTheanine
  22. In Search of a Safe Natural Sleep Aid.
    Rao TP; Ozeki M; Juneja LR · Journal of the American College of Nutrition · 2016
    Narrative reviewSleep Support forTheanine
  23. Anti-Stress, Behavioural and Magnetoencephalography Effects of an L-Theanine-Based Nutrient Drink: A Randomised, Double-Blind, Placebo-Controlled, Crossover Trial.
    White DJ; de Klerk S; Woods W; Gondalia S; Noonan C; Scholey AB · Nutrients · 2016
    Randomized trial34 participantsStress Relief forTheanine