Product Image

Sustained Focus

Nature's Way
4.6
★ ★ ★ ★ ★
(80 ratings)
Theanine 200 mg
Product Image
Score77
Substantial spearmint and L-theanine amounts make a coherent stimulant-free focus formula. The three-capsule serving and less established spearmint evidence are the main trade-offs.
How scoring works
Quantity:60 Capsule(s) • (20 servings)
Goals:
Brain Health
Productivity Boost
Cognitive Support
Stress Relief
Mental Focus
Mood Support
Sleep Support

Score 77

Substantial spearmint and L-theanine amounts make a coherent stimulant-free focus formula. The three-capsule serving and less established spearmint evidence are the main trade-offs.
How scoring works
$19.44($0.97 per serving)
Vitacost
$ 20.65
iHerb
$ 19.44
Vitacost
$ 20.65
Report prices

Analysis

A 900 mg branded spearmint extract and 200 mg of L-theanine create a focused, stimulant-free cognitive formula. The pairing addresses memory or sustained attention alongside calm mental performance.

Its best fit is daytime productivity and brain support when overstimulation or tension impairs work. Sleep support rests mainly on relaxation, and spearmint has a less established evidence base than classic cognitive ingredients.

Both active amounts are transparent and meaningful. Three capsules are needed per serving, and the generic theanine source has no stated purity standard.

Who is it for
  • Adults seeking stimulant-free cognitive support
  • People whose focus declines under stress
  • Users comfortable taking three capsules
Best for
  • Sustained daytime attention
  • Calm productivity
  • Memory and focus support together

Pros

  • Substantial branded spearmint extract
  • Well-aligned 200 mg L-theanine amount
  • Two complementary cognitive pathways
  • Clearly disclosed active amounts

Cons

  • Three capsules per serving
  • Spearmint evidence is still emerging
  • Generic theanine source

Nutrient quality

91 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

56 Moderate impact

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

.

Value for money

72 High impact

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

.
Report analysis

Goals

Brain Health
Brain Health
Impact
Highest effect
A- Goal FitA Strength of SupportB+ CoverageA+ Formula Quality

A substantial branded spearmint extract and 200 mg L-theanine provide direct memory and calm-focus support. The two ingredients address complementary cognitive pathways without relying on stimulants.

Spearmint has promising human evidence, although it is less established than classic nootropics. Generic theanine sourcing lacks purity detail, but the formula remains transparent and focused.

Study evidence
Theanine Supportive 17 studies
Productivity Boost
Productivity Boost
Impact
Highest effect
A- Goal FitA- Strength of SupportB CoverageA+ Formula Quality
Theanine · 200 mg

Branded spearmint extract and L-theanine form a focused combination for sustained attention and calm mental performance. The formula avoids stimulants, which may suit users who want steadier focus without acute stimulation.

Both actives are supplied at substantial, clearly disclosed amounts. The compact two-ingredient design is coherent and free from obvious padding.

Study evidence
Theanine Supportive 5 studies
Cognitive Support
Cognitive Support
Impact
Highest effect
B+ Goal FitA- Strength of SupportB CoverageA+ Formula Quality
Theanine · 200 mg

A large branded spearmint extract and a well-dosed L-theanine amount create a focused two-pathway cognitive formula. The pairing targets memory or reasoning support alongside calm attention without stimulant reliance.

Theanine sourcing lacks a branded purity signal, but both active amounts are transparent and meaningful. The streamlined design provides strong depth while avoiding low-dose extras.

Study evidence
Theanine Supportive 25 studies
Stress Relief
Stress Relief
Impact
Highest effect
A- Goal FitA- Strength of SupportC CoverageA+ Formula Quality
Theanine · 200 mg

L-theanine provides a well-aligned amount for calm focus without deliberate sedation. The substantial spearmint extract may support attention but is less directly tied to stress reduction.

Both active amounts are transparent, though theanine lacks a branded purity source. The short formula suits daytime mental pressure better than physical tension or chronic HPA-axis stress.

Study evidence
Theanine Supportive 16 studies
Mental Focus
Mental Focus
Impact
Highest effect
B Goal FitA Strength of SupportB- CoverageA- Formula Quality
Theanine · 200 mg

A 200 mg L-theanine amount and 900 mg branded spearmint extract create a focused, stimulant-free cognitive formula. Theanine supports calm attention, while spearmint may contribute to working memory and sustained concentration.

Both active amounts are clearly disclosed and the ingredient list is lean. Evidence for spearmint is promising but less extensive than evidence for caffeine-based alertness.

Study evidence
Theanine Supportive 19 studies
Mood Support
Mood Support
Impact
Highest effect
C+ Goal FitA Strength of SupportB CoverageA+ Formula Quality

A 200 mg L-theanine amount provides meaningful calm support, while branded spearmint may aid cognitive resilience. The combination may help mood when stress and mental fatigue occur together.

The formula lacks a direct serotonin precursor, omega-3 source, or well-established antidepressant botanical. Its focused design still offers useful depth without a crowded blend.

Study evidence
Theanine Supportive 12 studies
Sleep Support
Sleep Support
Impact
High effect
C- Goal FitA- Strength of SupportC- CoverageA- Formula Quality
Theanine · 200 mg

L-theanine at 200 mg provides meaningful nervous-system calming that may help users unwind. The product is positioned for sustained daytime focus, and spearmint is not a well-established sleep active.

Both active amounts are clear and the formula is streamlined. It lacks circadian support and physical relaxation ingredients, so the sleep benefit rests almost entirely on theanine.

Study evidence
Theanine Supportive 8 studies

Ingredients

IngredientAmount per serving
Total Carbohydrates
1 Gram(s)
Neumentix Spearmint leaf extract
900 mg
L-Theanine
200 mg
Gluten Free Adults 18–50 Dairy Free Women
Report overview
Theanine · 200 mg OverallScore88
B+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB+ Value

The clearly disclosed 200 mg L-theanine amount sits in the preferred range. Generic theanine sourcing lacks purity assurance, while the substantial branded spearmint extract adds meaningful formula value. Three capsules per serving may be less convenient for regular use.

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 more focused formula is easier to assess than the original multi-ingredient blend and avoids unrelated active ingredients.</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 more focused formula is easier to assess than the original multi-ingredient blend and avoids unrelated active ingredients.</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 more focused formula is easier to assess than the original multi-ingredient blend and avoids unrelated active ingredients.</p>
85 Budget

Double Strength L-Theanine 200 mg

NOW
<p>A lower serving cost comes with 200 mg of clearly stated l-theanine. The more focused formula is easier to assess than the original multi-ingredient blend and avoids unrelated active ingredients.</p>
84 Budget

L-Theanine 200 mg

Advance Physician Formulas
<p>A lower serving cost comes with 200 mg of clearly stated l-theanine. The more focused formula is easier to assess than the original multi-ingredient blend and avoids unrelated active ingredients.</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 more focused formula is easier to assess than the original multi-ingredient blend and avoids unrelated active ingredients.</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. The more focused formula is easier to assess than the original multi-ingredient blend and avoids unrelated active ingredients.</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. The more focused formula is easier to assess than the original multi-ingredient blend and avoids unrelated active ingredients.</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 more focused formula is easier to assess than the original multi-ingredient blend and avoids unrelated active ingredients.</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 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. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  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