Product Image

L-Theanine 200 mg

Source Naturals Serene Science
4.6
★ ★ ★ ★ ★
(362 ratings)
Theanine 200 mg
Product Image
Score94

A potent 200 mg theanine supplement designed for focused stress relief and mental calm.

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

Score 94

A potent 200 mg theanine supplement designed for focused stress relief and mental calm.

How scoring works
$24.85($0.41 per serving)
iHerb
$ 24.85
Vitacost
$ 24.85
Report prices

Analysis

Source Naturals provides a robust serving of L-theanine to help support a state of 'relaxed alertness' without causing sleepiness. This 200 mg dose is a standard clinical amount that many people find effective for quieting the mind during stress.

The capsule format is straightforward and uses the pure L-isomer for the best biological activity. It is a solid, reliable choice for anyone needing significant mental composure support.

Pros

  • Strong 200 mg therapeutic dose
  • Part of a specialized stress line
  • Clean and simple formulation
  • Highly regarded brand

Cons

  • Higher price than some competitors
  • Contains magnesium stearate as a filler

Warnings

  • Best taken on an empty stomach for focus
  • Store in a cool, dry place

Nutrient quality

95 Highest impact

A clinical 200mg dose of the primary amino acid is provided for effective relaxation. The single-ingredient focus ensures targeted support for alpha brain wave activity.

Ingredient transparency

100 Highest impact

The label clearly discloses the active ingredient and its specific amount per serving. Full transparency regarding serving sizes and excipients allows for a direct assessment of potency.

Customer satisfaction

91 Highest impact

Customer ratings reflect high satisfaction with the product's calming benefits. A sufficient review count indicates that the formula is reliable and effective for its users.

Value for money

86 Highest impact

Pricing is fair for a high-dose amino acid supplement from a well-known brand. It offers a reliable option for individuals seeking effective relaxation at a mid-range price point.

Report analysis

Goals

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

Consists of 200 mg of pure L-Theanine in capsule form. This ingredient is well known for inducing alpha brain wave activity, which supports a state of relaxed alertness without drowsiness.

The 200 mg dose is considered a standard clinical amount for achieving a calming effect. As a single-ingredient product, it offers high depth for one pathway but lacks the breadth provided by complex stress formulas.

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

L-Theanine is provided in a 200mg dose to support a calm state and help quiet the mind before rest.

Promoting mental relaxation via inhibitory aminos may contribute to reduced sleep latency and better overall rest.

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

L-Theanine at 200 mg per serving.

Providing an ideal clinical dose of this amino acid supports a calm mental state and a balanced response to daily stressors.

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

This selection provides a 200mg dose of L-Theanine per capsule to support mental relaxation and focused attention. L-Theanine promotes the generation of alpha brain waves, which are associated with relaxed alertness.

This high-dose amino acid supplement is ideal for managing stress-induced focus issues without causing sedation. The single-ingredient approach ensures precision and efficacy for individuals targeting calm focus.

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

L-Theanine is provided at a 200mg dose per capsule to support relaxation and a focused state of mind. This amino acid may contribute to alpha brain wave activity, which is associated with calm alertness.

The supplement focuses on a single pathway for stress-related cognitive support. The dosage appears well aligned with clinical research for achieving measurable neurological effects.

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

L-theanine at a 200mg dose supports a state of relaxed wakefulness, which may contribute to improved attention and focus. This clinical dosage is effective for modulating the perception of stress while maintaining cognitive clarity.

This amino acid is particularly useful for users looking to enhance mental resilience without the jittery side effects of stimulants. It appears well aligned for individuals seeking a clean and straightforward tool for focused productivity.

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

L-theanine supports focused alertness and relaxation by modulating brain wave activity. This amino acid may contribute to mental performance and resilience during periods of daily stress.

The formulation provides straightforward support for a calm mental state without sedation. Meaningful dosages of the active L-isomer ensure that the biological pathways for mental focus are well addressed.

View goal →

Ingredients

IngredientAmount per serving
L-Theanine
200 mg
Gluten Free Adults 18–50 Dairy Free Sugar Free
Report overview
Theanine · 200 mg OverallScore88
B+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB+ Value
A high-dose L-Theanine supplement that provides 200mg for reliable therapeutic calming and focus. It is a straightforward, clean capsule that is suitable for those requiring higher levels of stress support.
View ingredientView products
97 Value

L-Theanine 100 mg

California Gold Nutrition
4.7
★★★★★
(23398 ratings)
AlphaWave branded theanine provides professional-grade quality with high standardized purity at a mass-market value. It is an excellent option for users who want high-performance materials for less.
Other sellers (1)
98 Value

Double Strength L-Theanine 200 mg

NOW
4.7
★★★★★
(41779 ratings)
Includes inositol for extra emotional stability and brain health benefits at a highly competitive daily price. This combination delivers more functional components per dollar than single-ingredient formulas.
Other sellers (5)
96 Value

L-Theanine 200 mg Double Strength

Swanson
4.7
★★★★★
(500 ratings)
Standardized Suntheanine ensures a high-quality experience for relaxation and mental clarity. It provides clinical-strength theanine with excellent transparency and daily cost-efficiency.
Other sellers (1)
96 Performance

Suntheanine L-Theanine 100 mg

Natural Factors Stress-Relax
4.7
★★★★★
(3623 ratings)
Features branded Suntheanine, which is highly regarded for its purity and consistent results in research studies. This ensures a more predictable calming effect that may be better than generic sources.
Other sellers (2)
95 Performance

Suntheanine L-Theanine 125 mg

Natural Factors Stress-Relax
4.7
★★★★★
(1437 ratings)
Increases the active dose to 250mg of branded Suntheanine, providing superior therapeutic support for managing stress. The high potency ensures a deeper level of alert relaxation.
Other sellers (2)
95 Performance

ZenMind

NutriCology
4.6
★★★★★
(285 ratings)
The synergy between GABA and Suntheanine offers multi-pathway support that is significantly more effective than theanine alone. This blend provides a more comprehensive neurological response to pressure.
Other sellers (3)
97 Budget

L-Theanine 200 mg

Advance Physician Formulas
4.7
★★★★★
(619 ratings)
Delivers the same clinical-strength 200mg dosage at a significantly more attractive price point for daily users. It offers a straightforward, high-potency option for managing regular mental tension.
Other sellers (1)
98 Budget

L-Theanine 200 mg

California Gold Nutrition
4.7
★★★★★
(15500 ratings)
Provides a robust dose with verified purity and quality in a budget-friendly capsule format. This clean formula is perfect for those who want potent relaxation results without unnecessary markups.
Other sellers (0)
97 Budget

Double Strength L-Theanine 200 mg

NOW
4.7
★★★★★
(42165 ratings)
Adds inositol to the 200mg theanine dose for broader metabolic and focus support at an excellent price. It represents a more functional and budget-friendly alternative for steady composers.
Other sellers (5)
97 Value

L-Theanine 100 mg

California Gold Nutrition
4.7
★★★★★
(23398 ratings)
AlphaWave branded theanine provides professional-grade quality with high standardized purity at a mass-market value. It is an excellent option for users who want high-performance materials for less.
Other sellers (1)
98 Value

Double Strength L-Theanine 200 mg

NOW
4.7
★★★★★
(41779 ratings)
Includes inositol for extra emotional stability and brain health benefits at a highly competitive daily price. This combination delivers more functional components per dollar than single-ingredient formulas.
Other sellers (5)
96 Value

L-Theanine 200 mg Double Strength

Swanson
4.7
★★★★★
(500 ratings)
Standardized Suntheanine ensures a high-quality experience for relaxation and mental clarity. It provides clinical-strength theanine with excellent transparency and daily cost-efficiency.
Other sellers (1)
96 Performance

Suntheanine L-Theanine 100 mg

Natural Factors Stress-Relax
4.7
★★★★★
(3623 ratings)
Features branded Suntheanine, which is highly regarded for its purity and consistent results in research studies. This ensures a more predictable calming effect that may be better than generic sources.
Other sellers (2)
95 Performance

Suntheanine L-Theanine 125 mg

Natural Factors Stress-Relax
4.7
★★★★★
(1437 ratings)
Increases the active dose to 250mg of branded Suntheanine, providing superior therapeutic support for managing stress. The high potency ensures a deeper level of alert relaxation.
Other sellers (2)
95 Performance

ZenMind

NutriCology
4.6
★★★★★
(285 ratings)
The synergy between GABA and Suntheanine offers multi-pathway support that is significantly more effective than theanine alone. This blend provides a more comprehensive neurological response to pressure.
Other sellers (3)
Report alternatives