Product Image

Suntheanine L-Theanine 125 mg

Natural Factors Stress-Relax
4.7
★ ★ ★ ★ ★
(1437 ratings)
Theanine 250 mg
Product Image
Score95

A clinical-strength 250mg dose of branded Suntheanine for deep relaxation support.

How scoring works
Quantity:60 Capsule(s) • (30 servings)
Goals:
Sleep Support
Stress Relief
Brain Health
Mental Focus
Productivity Boost
Cognitive Support
Mood Support

Score 95

A clinical-strength 250mg dose of branded Suntheanine for deep relaxation support.

How scoring works
$17.39($0.57 per serving)
Amazon
$ 18.87
Vitacost
$ 18.87
iHerb
$ 18.87
Report prices

Analysis

By providing 250mg of Suntheanine, this product delivers a robust amount of theanine in a single capsule. This branded form is recognized for its high purity and consistent performance in supporting relaxation.

This higher dose is well-aligned with goals like improving sleep quality or managing significant stress during the day. It is an effective, high-strength choice for those seeking noticeable results.

Pros

  • Highest quality Suntheanine form
  • Potent clinical dosage
  • Supports sleep and stress relief
  • No artificial fillers

Cons

  • Higher price per serving
  • Fewer capsules per bottle
  • May be too relaxing for some daytime use

Warnings

  • May cause mild drowsiness
  • Avoid use with alcohol
  • Keep in a cool, dry place

Nutrient quality

98 Highest impact

Utilization of the branded Suntheanine form ensures consistent isomer purity and quality. A 250mg dose per serving is at the upper end of common clinical ranges for focus and rest.

Ingredient transparency

100 Highest impact

Active ingredients and their standardized forms are clearly disclosed on the label. The single-ingredient focus allows for complete transparency regarding the active dose.

Customer satisfaction

96 Highest impact

User feedback is consistently high, reflecting the reliable quality of the Suntheanine source. A large review count confirms the product's effectiveness for stress and focus support.

Value for money

84 Highest impact

The price per serving is higher than generic alternatives but reflects the use of premium branded material. Overall value remains strong due to the verified purity and efficacy of the ingredient.

Report analysis

Goals

Sleep Support
Impact
Highest effect
A+ Goal FitA+ Strength of SupportC+ CoverageA+ Formula Quality

Suntheanine L-Theanine is provided in a high-quality, 250mg clinical dose to support mental relaxation and stress reduction. This branded form is the most studied on the market, ensuring consistent isomer purity and effectiveness.

The 250mg dose is optimally positioned for reducing sleep latency by quieting the mind. It is a premier choice for individuals whose sleep quality is impacted by nighttime mental activity or stress.

View goal →
Stress Relief
Impact
Highest effect
A+ Goal FitA+ Strength of SupportC CoverageA+ Formula Quality

Branded Suntheanine ensures the highest quality and purity for this clinical-strength dose of L-theanine. This amino acid is renowned for its ability to promote cognitive relaxation and induce calming alpha brain waves.

The 250mg dosage is right at the top of the therapeutic range for providing significant psychological stress relief. This logic-driven formula is a premier choice for those seeking a highly reliable and fast-acting tool for mental calm.

View goal →
Brain Health
Impact
Highest effect
A+ Goal FitA+ Strength of SupportC+ CoverageA+ Formula Quality

High-purity calming support utilizes a branded extract to promote mental relaxation and focused attention. This focused approach aids in regulating alpha brain waves for improved mental clarity and stress resilience.

Ingredients consist of 250mg of Suntheanine L-theanine. This premium form ensures high bioavailability and superior potency for cognitive support.

View goal →
Mental Focus
Impact
Highest effect
A Goal FitA+ Strength of SupportC+ CoverageA+ Formula Quality

Utilizes the premier branded Suntheanine to ensure high purity and consistent L-isomer content for optimal brain support. This form of theanine is clinically shown to promote a calm, focused state without causing unwanted drowsiness.

Meaningfully dosed at 250mg, it provides robust support for those seeking to sharpen their attention and reduce stress-induced distractions. The clean formulation and ISURA certification guarantee a high-quality product for individuals requiring reliable focus aids.

View goal →
Productivity Boost
Impact
Highest effect
A+ Goal FitA+ Strength of SupportC+ CoverageA Formula Quality

Suntheanine l-theanine provides a highly pure source of this amino acid to support focused wakefulness. This ingredient promotes alpha brain wave activity, which may contribute to a calm but attentive mental state.

The 250mg dose is at the top of the clinical range for significant material impact on attention. It appears well aligned for individuals seeking a reliable nootropic for supporting mental clarity during intense work.

View goal →
Cognitive Support
Impact
Highest effect
A+ Goal FitA+ Strength of SupportC+ CoverageA+ Formula Quality

This high-purity L-theanine supplement uses branded Suntheanine to ensure consistent quality and maximum biological effectiveness. Suntheanine supports a state of relaxed alertness by promoting alpha brain wave activity and managing the effects of cognitive stress.

Providing 250mg per serving delivers a therapeutic dose that is well-aligned with clinical studies for improving focus and attention. This selection is a premier option for individuals seeking high-quality calm focus in a concentrated single-ingredient format.

View goal →
Mood Support
Impact
Highest effect
A Goal FitA+ Strength of SupportC- CoverageA+ Formula Quality

Suntheanine L-Theanine is a high-purity branded extract that supports focused relaxation and emotional balance.

By promoting alpha brain wave activity, this supplement helps individuals manage the physical and mental response to stress.

View goal →

Ingredients

IngredientAmount per serving
Suntheanine L-Theanine
250 mg
Gluten Free Adults 18–50 Vegan Dairy Free Sugar Free Vegetarian
Report overview
Theanine · 250 mg OverallScore96
A+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB+ Value
This high-purity supplement uses 250mg of Suntheanine to provide maximum stress relief in a single capsule. It is an ideal choice for those who want the highest quality form of theanine in a robust clinical dosage.
View ingredientView products
97 Value

L-Theanine 100 mg

California Gold Nutrition
4.7
★★★★★
(23398 ratings)
AlphaWave branded ingredients provide a high-purity experience with excellent value for the price. It is an ideal entry point for those wanting professional-grade materials at a mass-market price point.
Other sellers (1)
96 Value

L-Theanine 200 mg Double Strength

Swanson
4.7
★★★★★
(500 ratings)
Provides the same high-quality Suntheanine brand in a 200mg dose with better long-term value per capsule. It balances premium sourcing with a very sustainable price structure.
Other sellers (1)
98 Value

Double Strength L-Theanine 200 mg

NOW
4.7
★★★★★
(41779 ratings)
The pairing with inositol adds extra cognitive support, making this a high-performing choice for focus and mood. It delivers substantial clinical-strength benefits at a very competitive price.
Other sellers (5)
93 Performance

Theanine

Thorne
4.7
★★★★★
(1327 ratings)
Utilizes a highly purified Suntheanine source from a brand recognized for exceptional manufacturing standards. This ensures high purity and consistency for individuals with sensitive requirements.
Other sellers (3)
95 Performance

ZenMind

NutriCology
4.6
★★★★★
(285 ratings)
The inclusion of GABA alongside Suntheanine provides multi-pathway support for a calm nervous system. This combination is ideal for those who need more than just theanine for their relaxation goals.
Other sellers (3)
92 Performance

Anxiety & Stress Relief

Nature's Bounty
4.5
★★★★★
(10003 ratings)
Combines a strong dose of Ashwagandha with theanine to help regulate the body's response to daily stress. The standardized botanical extracts offer a more comprehensive approach to mental composure.
Other sellers (2)
97 Budget

Double Strength L-Theanine 200 mg

NOW
4.7
★★★★★
(42165 ratings)
Provides a robust 200mg dose along with inositol for better cost-effectiveness per serving. It offers similar relaxation benefits while significantly reducing the long-term price for daily users.
Other sellers (5)
98 Budget

L-Theanine 200 mg

California Gold Nutrition
4.7
★★★★★
(15500 ratings)
Delivers a high potency of the primary active ingredient in a budget-friendly capsule format. It is a clean, simple option that focuses on value without sacrificing the dosage needed for stress support.
Other sellers (0)
97 Budget

L-Theanine 200 mg

Advance Physician Formulas
4.7
★★★★★
(619 ratings)
Offers excellent affordability for a 200mg dosage, making it one of the most cost-effective ways to supplement theanine. It is perfect for maintaining consistent levels of relaxation on a budget.
Other sellers (1)
97 Value

L-Theanine 100 mg

California Gold Nutrition
4.7
★★★★★
(23398 ratings)
AlphaWave branded ingredients provide a high-purity experience with excellent value for the price. It is an ideal entry point for those wanting professional-grade materials at a mass-market price point.
Other sellers (1)
96 Value

L-Theanine 200 mg Double Strength

Swanson
4.7
★★★★★
(500 ratings)
Provides the same high-quality Suntheanine brand in a 200mg dose with better long-term value per capsule. It balances premium sourcing with a very sustainable price structure.
Other sellers (1)
98 Value

Double Strength L-Theanine 200 mg

NOW
4.7
★★★★★
(41779 ratings)
The pairing with inositol adds extra cognitive support, making this a high-performing choice for focus and mood. It delivers substantial clinical-strength benefits at a very competitive price.
Other sellers (5)
93 Performance

Theanine

Thorne
4.7
★★★★★
(1327 ratings)
Utilizes a highly purified Suntheanine source from a brand recognized for exceptional manufacturing standards. This ensures high purity and consistency for individuals with sensitive requirements.
Other sellers (3)
95 Performance

ZenMind

NutriCology
4.6
★★★★★
(285 ratings)
The inclusion of GABA alongside Suntheanine provides multi-pathway support for a calm nervous system. This combination is ideal for those who need more than just theanine for their relaxation goals.
Other sellers (3)
92 Performance

Anxiety & Stress Relief

Nature's Bounty
4.5
★★★★★
(10003 ratings)
Combines a strong dose of Ashwagandha with theanine to help regulate the body's response to daily stress. The standardized botanical extracts offer a more comprehensive approach to mental composure.
Other sellers (2)
Report alternatives