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L-Theanine 200 mg

SR Sports Research
4.5
★ ★ ★ ★ ★
(18715 ratings)
Theanine 200 mg
Product Image
Score83
A 200 mg softgel provides simple, efficient calm-focus support. Missing source and excipient detail plus narrow pathway coverage are the main limits.
How scoring works
Quantity:60 Softgel(s) • (60 servings)
Goals:
Stress Relief
Cognitive Support
Sleep Support
Mental Focus
Mood Support
Productivity Boost
Brain Health

Score 83

A 200 mg softgel provides simple, efficient calm-focus support. Missing source and excipient detail plus narrow pathway coverage are the main limits.
How scoring works
$19.95($0.33 per serving)
Vitacost
$ 23.05
Amazon
$ 19.95
iHerb
$ 20.97
iHerb
$ 20.97
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Analysis

A softgel delivers 200 mg of L-theanine for substantial calm-attention and relaxation support. The single-active formula avoids low-dose extras and keeps the serving easy to assess.

It best fits stress-related distraction and mental tension before sleep rather than broad cognitive enhancement. L-theanine alone does not directly increase alertness or address memory, brain energy, or circadian timing.

One softgel per serving, extensive aggregate feedback, and good active efficiency support everyday use. The source, purity standard, and inactive softgel ingredients are not supplied.

Who is it for
  • Adults seeking a softgel format
  • People wanting a substantial theanine amount
  • Users focused on situational calm
Best for
  • Stress-related distraction
  • Calm attention
  • Pre-sleep relaxation

Pros

  • Substantial 200 mg amount
  • One softgel per serving
  • Single-active formula
  • Extensive aggregate feedback

Cons

  • Generic source
  • Inactive softgel ingredients were not supplied
  • No complementary cognitive active

Nutrient quality

94 Highest impact

L-theanine is a defined amino acid, although no branded source or purity marker is supplied. The L-theanine amount is well aligned with common calming and focus use.

.

Ingredient transparency

81 Highest impact

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

.

Customer satisfaction

65 High impact

The supplied aggregate rating is moderately positive, although no specific comments are included. The large rating count makes the aggregate result relatively stable.

.

Value for money

87 Highest impact

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

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Report analysis

Goals

Stress Relief
Stress Relief
Impact
Highest effect
A Goal FitA Strength of SupportB- CoverageA+ Formula Quality
Theanine · 200 mg

A well-dosed L-theanine serving provides focused support for calm attention without a stimulant. The amount sits in a strong targeted range for acute relaxation.

Pathway breadth is narrow, but depth and formulation clarity are strong. The exact L-form is stated, although branded sourcing, purity verification, and independent testing are not provided.

Study evidence
Theanine Supportive 16 studies
Cognitive Support
Cognitive Support
Impact
Highest effect
B+ Goal FitA+ Strength of SupportC- CoverageA+ Formula Quality
Theanine · 200 mg

L-theanine provides well-aligned non-stimulant support for calm attention and stress-related distraction. Human evidence is useful for selected focus outcomes, though effects can be modest when it is used alone.

The 200 mg amount is appropriate and fully disclosed in a simple softgel. Missing source, purity, and testing details are the main quality limitations.

Study evidence
Theanine Supportive 25 studies
Sleep Support
Sleep Support
Impact
Highest effect
B+ Goal FitA+ Strength of SupportC- CoverageA Formula Quality
Theanine · 200 mg

L-theanine is supplied at a useful amount for easing mental tension before bed. Clear individual disclosure supports confidence that the formula provides a meaningful calming dose.

The effect is likely gentle because L-theanine is not a direct sedative or circadian regulator. Generic sourcing without a purity or branded-form claim leaves some quality uncertainty.

Study evidence
Theanine Supportive 8 studies
Mental Focus
Mental Focus
Impact
Highest effect
B+ Goal FitA Strength of SupportC- CoverageA+ Formula Quality
Theanine · 200 mg

L-theanine provides a well-aligned amount for calm attention without adding a stimulant. The clearly identified L-isomer supports a focused, transparent formula.

Human evidence is strongest when theanine is paired with caffeine, so standalone effects may be subtle. The simple design offers good depth for stress-related distraction but limited pathway breadth.

Study evidence
Theanine Supportive 19 studies
Mood Support
Mood Support
Impact
Highest effect
B+ Goal FitA Strength of SupportC- CoverageA+ Formula Quality

L-theanine provides focused support for calm alertness and acute stress without adding a stimulant. The clearly disclosed 200 mg amount sits in a well-aligned range and gives the narrow formula meaningful depth.

Its role is better suited to situational relaxation than broad, long-term mood stabilization because it covers only one main pathway. Quality assurance remains uncertain because no branded theanine source, purity claim, or independent testing detail is provided.

Study evidence
Theanine Supportive 12 studies
Productivity Boost
Productivity Boost
Impact
High effect
B- Goal FitA Strength of SupportD+ CoverageA- Formula Quality
Theanine · 200 mg

L-theanine may support calm attention and reduce stress-related distraction. The 200 mg amount fits common studied use.

Without caffeine or another alertness ingredient, the effect on productivity may be subtle and is more calming than energizing. The single-ingredient design is transparent and avoids unnecessary additions.

Study evidence
Theanine Supportive 5 studies
Brain Health
Brain Health
Impact
High effect
C Goal FitB+ Strength of SupportD+ CoverageA Formula Quality

L-theanine supports calm, focused alertness without relying on a stimulant. The 200 mg amount is clearly disclosed in a simple liquid softgel and fits a commonly used range.

The single active provides good depth for attention under stress but does not address memory, brain energy, or neuronal structure. No meaningful product-specific safety concern is evident from the disclosed ingredient and amount.

Study evidence
Theanine Supportive 17 studies

Ingredients

IngredientAmount per serving
L-Theanine
200 mg
Adults 18–50
Report overview
Theanine · 200 mg OverallScore88
B+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB+ Value

Explicit L-Theanine at a well-aligned dose supports relaxation and focus without an added stimulant. The label clearly states the active amount, though it gives no branded source, purity claim, or independent testing detail. Cost efficiency is competitive for the amount supplied.

View ingredientView products
Loading alternative details
87 Performance

L-Theanine 200 mg Double Strength

Swanson
<p>200 mg of clearly identified branded L-theanine gives the formula a clear and relevant foundation. The branded source provides clearer ingredient identity than the original generic theanine listing.</p>
85 Performance

L-Theanine 150 mg

Solgar
<p>150 mg of clearly identified branded L-theanine gives the formula a clear and relevant foundation. The branded source provides clearer ingredient identity than the original generic theanine listing.</p>
87 Performance

L-Theanine 100 mg

California Gold Nutrition
<p>100 mg of clearly identified branded L-theanine gives the formula a clear and relevant foundation. The branded source provides clearer ingredient identity than the original generic theanine listing.</p>
85 Budget

Double Strength L-Theanine 200 mg

NOW
<p>A lower serving cost comes with 200 mg of clearly stated l-theanine. Its disclosed ingredient profile aligns more closely with focused theanine use than the original formula.</p>
84 Budget

L-Theanine 200 mg

Advance Physician Formulas
<p>A lower serving cost comes with 200 mg of clearly stated l-theanine. Its disclosed ingredient profile aligns more closely with focused theanine use than the original formula.</p>
83 Budget

L-Theanine 100 mg

California Gold Nutrition
<p>A lower serving cost comes with 100 mg of clearly stated l-theanine. The ingredient profile remains focused on theanine and offers a practical alternative to the original formula.</p>
85 Value

L-Theanine 200 mg

California Gold Nutrition
<p>200 mg of clearly stated L-theanine is paired with favorable serving-level value in the supplied data. Its disclosed ingredient profile aligns more closely with focused theanine use than the original formula.</p>
85 Value

L-Theanine 100 mg

NOW
<p>100 mg of clearly stated L-theanine is paired with favorable serving-level value in the supplied data. Its disclosed ingredient profile aligns more closely with focused theanine use than the original formula.</p>
84 Value

Suntheanine L-Theanine 125 mg

Natural Factors Stress-Relax
<p>250 mg of clearly identified branded L-theanine is paired with favorable serving-level value in the supplied data. The branded source provides clearer ingredient identity than the original generic theanine listing.</p>
Report alternatives

Sources

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

  1. 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
  2. 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
  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. 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 Brain Health Cognitive Support forTheanine
  5. 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
  6. 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
  7. 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 trialBrain Health Stress Relief forTheanine
  8. 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
  9. 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
  10. 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 trialBrain Health Mental Focus Productivity Boost 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. 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 participantsMental Focus Productivity Boost Stress Relief forTheanine
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  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. 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 participantsProductivity Boost forTheanine
  21. 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
  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