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L-Tryptophan 500 mg

Life Extension
4.7
★ ★ ★ ★ ★
(1743 ratings)
Tryptophan 500 mg
Product Image
Score95

A pure 500 mg L-tryptophan capsule that supports healthy mood, sleep cycles, and stress management.

How scoring works
Quantity:90 Capsule(s) • (90 servings)
Goals:
Mood Support
Sleep Support
Stress Relief

Score 95

A pure 500 mg L-tryptophan capsule that supports healthy mood, sleep cycles, and stress management.

How scoring works
$24.75($0.27 per serving)
Amazon
$ 24.75
Pure Formulas
$ 24.75
Vitacost
$ 24.75
iHerb
$ 24.75
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Analysis

L-tryptophan is an essential amino acid that serves as a direct precursor for the sleep-regulating hormone melatonin and the mood-balancing chemical serotonin. This focused supplement provides a reliable dose to support your natural daily rhythms and emotional resilience.

The high manufacturing standards of Life Extension ensure you are getting a clean product for consistent neurotransmitter support. This capsule is a solid choice for those who need to support their sleep architecture and mental calm through targeted nutrition.

Pros

  • Pharmaceutical-grade quality
  • Supports serotonin pathways
  • Standard therapeutic dose
  • Excellent label transparency

Cons

  • Moderate price point
  • Limited to one active ingredient
  • Requires consistent daily use

Warnings

  • May cause sleepiness
  • Do not mix with antidepressants
  • Take on an empty stomach for best results

Nutrient quality

95 Highest impact

Standard free-form L-tryptophan provides reliable biological activity for serotonin-related goals. The 500 mg dose aligns with clinical targets for daily neurotransmitter support.

Ingredient transparency

100 Highest impact

Labeling is exceptionally clear, identifying the specific amino acid and its milligram count. Precise instructions and disclosure of all components support consumer safety and effective use.

Customer satisfaction

96 Highest impact

Strong ratings and a large review count indicate consistent efficacy and user satisfaction. Consumer feedback confirms that the product effectively supports emotional balance and sleep quality.

Value for money

88 Highest impact

The cost per serving is fair for a high-purity, clinical-strength amino acid supplement. Consistent manufacturing quality and effective dosing provide strong overall value for the user.

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Goals

Mood Support
Impact
Highest effect
A Goal FitA Strength of SupportB- CoverageA+ Formula Quality

L-tryptophan at 500 mg serves as a primary amino acid precursor for the synthesis of serotonin. This focused approach appears well aligned with goals for maintaining healthy emotional balance and a stable mood.

A single-ingredient formulation ensures clear and direct support for the serotonin pathway. The dose is meaningfully high and aligns with established clinical protocols for daily mood support.

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

L-tryptophan serves as a direct amino acid precursor for the endogenous production of serotonin and melatonin. This focused single-ingredient supplement appears well aligned with supporting the natural sleep cycle and emotional balance.

L-tryptophan may contribute to improved sleep quality and duration. A 500mg dose provides meaningful support for the body's rest-regulating systems.

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

L-tryptophan at 500mg supports the natural production of serotonin, which is a vital neurotransmitter for mood stability and emotional calm. This amino acid precursor appears well-aligned for those seeking to naturally support their emotional resilience during stressful periods.

Providing 500mg represents a meaningfully potent dose that fits squarely within effective clinical ranges. As a single-ingredient product, it offers deep support for the serotonin pathway but lacks the broad adaptogenic or mineral support found in multi-mechanism formulas.

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Ingredients

IngredientAmount per serving
L-Tryptophan
500 mg
Adults 18–50
Report overview
Tryptophan · 500 mg OverallScore91
A- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB+ Value
This is a high-quality, standalone Tryptophan supplement that provides a standard clinical dose. It is an effective and simple option for those looking to support their serotonin levels naturally.
View ingredientView products
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Including cofactors like niacin and lysine ensures more efficient metabolic transport and utilization of the tryptophan. This synergistic blend is designed to support both neurotransmitter levels and healthy sleep cycles.
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L-Tryptophan Powder

NOW
4.3
★★★★★
(557 ratings)
Pure powder provides excellent flexibility for those who wish to adjust their dose based on nightly needs. It is a highly pure formula that removes the need for capsule excipients and extra fillers.
Other sellers (5)
94 Value

L-Tryptophan 500 mg

Advanced Nutrition by Zahler
4.6
★★★★★
(140 ratings)
Vitamin B3 is added to support the brain's uptake of the amino acid, helping to prevent its use in other metabolic pathways. This approach maximizes the effectiveness of every milligram for mood support.
Other sellers (2)
93 Value

L-Tryptophan 500 mg

Bluebonnet
4.6
★★★★★
(441 ratings)
Standardizing to a high-quality capsule form ensures a reliable and convenient daily serving. The clear label transparency and high manufacturing standards provide a safe foundation for neurotransmitter health.
Other sellers (3)
87 Performance

Optimized Tryptophan Plus

Life Extension
4.7
★★★★★
(1480 ratings)
Including cofactors like niacin and lysine ensures more efficient metabolic transport and utilization of the tryptophan. This synergistic blend is designed to support both neurotransmitter levels and healthy sleep cycles.
Other sellers (2)
94 Performance

Sleep Nighttime Powder

youtheory
4.3
★★★★★
(171 ratings)
Potent levels of glycine and magnesium are combined with 5-HTP and tryptophan to address multiple pathways of relaxation. The powder delivery system can contribute to faster onset and better sleep quality.
Other sellers (2)
93 Performance

Serotonin Brain Food

NS Natural Stacks
4.7
★★★★★
(763 ratings)
Bioavailable zinc and magnesium glycinate serve as essential catalysts for serotonin synthesis. Standardized rhodiola extract adds a layer of adaptogenic support for mental focus and mood during stressful times.
Other sellers (0)
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