L-Tryptophan 500 mg

L-Tryptophan 500 mg

Swanson Ultra4.7 (206 ratings)
Format:Capsule Quantity: 90 Veggie Cap(s) · 90 servings
Goals
$29.19 $0.32 per serving
iHerbLowest$29.19iHerb$29.19

Product analysis

59 out of 100

L-Tryptophan 500 mg offers a simple ingredient involved in mood-related and sleep-related pathways. Direct relief of everyday stress or a clear improvement in falling asleep remains uncertain.

AI assessment of the formula, label and price. How scoring works

Nutrient Quality40

L-tryptophan is identified, but its quality cannot be confirmed further. The available details do not establish an absorption advantage.

Ingredient Transparency100

The tryptophan amount and form are disclosed. That makes the serving straightforward to identify and compare.

Value For Money40

There is not enough information to judge value for money. A reliable cost comparison for the tryptophan serving is unavailable.

Customer Satisfaction73

Customer feedback is very positive, with a modest review base. The smaller number of ratings gives a less established picture of satisfaction.

Product Focus55

The formula focuses on one ingredient connected to mood and sleep. Those connections do not establish reliable everyday stress relief or a direct benefit for sleep timing.

Format
Capsule
Container
90 Veggie Cap(s)
Per serving
$0.32
Customer rating
4.7 · 206 ratings
Report analysis

Goals

Stress Relief
Stress Relief
Impact
High effect
B Ingredient FitF PathwaysC+ EvidenceA+ Formulation Logic
Tryptophan · 500 mg
Study evidence
Sleep Support
Sleep Support
Impact
Moderate effect
B Ingredient FitF PathwaysD+ EvidenceA+ Formulation Logic
Study evidence
Mood Support
Mood Support
Impact
Lower effect
B Ingredient FitF PathwaysF EvidenceA+ Formulation Logic
Study evidence

Ingredients

IngredientAmount per servingScore
Ajinomoto TryptoPure L-Tryptophan
500 mg
Adults 18–50 Vegetarian
Report overview
83 Performance

L-Tryptophan 1000 mg

AN Amazing Nutrition Amazing Formulas
The standalone L-form is appropriate, though a tablet is a less flexible delivery format. The supplied analysis indicates a stronger formulation than the original, without relying on an exact price comparison.
83 Performance

L-Tryptophan 500 mg

Jarrow Formulas
The standalone L-form avoids competing amino acids, but source-grade details are not supplied. The supplied analysis indicates a stronger formulation than the original, without relying on an exact price comparison.
82 Performance

L-Tryptophan Powder

NOW
The standalone powder avoids competing amino acids and allows flexible measuring. The supplied analysis indicates a stronger formulation than the original, without relying on an exact price comparison.
85 Budget

L-Tryptophan 500 mg

Doctor's Best
Branded TryptoPure provides useful source-quality differentiation. Its supplied serving cost is lower than the original’s, while the tryptophan-focused formula remains relevant.
84 Budget

L-Tryptophan 500 mg

Life Extension
The standalone L-form avoids competing amino acids, but source-grade details are not supplied. Its supplied serving cost is lower than the original’s, while the tryptophan-focused formula remains relevant.
83 Budget

L-Tryptophan 500 mg

Swanson
The standalone L-form avoids competing amino acids, but source-grade details are not supplied. Its supplied serving cost is lower than the original’s, while the tryptophan-focused formula remains relevant.
82 Value

L-Tryptophan 1000 mg

AN Amazing Nutrition Amazing Formulas
The standalone L-form is appropriate, though a tablet is a less flexible delivery format. Its formulation quality and lower supplied serving cost create a favorable value balance versus the original.
82 Value

Sleep Nighttime Powder

youtheory
Glycine, L-theanine, magnesium citrate, tryptophan, 5-HTP, and low-dose melatonin create a well-dosed nighttime formula. Its formulation quality may justify the higher supplied serving cost, though the value advantage depends on prioritizing the ingredient profile.
78 Value

L-Tryptophan 500 mg

Advanced Nutrition by Zahler
The standalone L-form avoids competing amino acids, but source-grade details are not supplied. Its formulation quality and lower supplied serving cost create a favorable value balance versus the original.
Report alternatives

Sources

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

  1. A systematic review of the effect of L-tryptophan supplementation on mood and emotional functioning
    Kikuchi AM, Tanabe A, Iwahori Y · Journal of Dietary Supplements · 2021
    Systematic review11 studies pooledMood Support forTryptophan
  2. The impact of tryptophan supplementation on sleep quality: a systematic review, meta-analysis, and meta-regression
    Clarinda N Sutanto, Wen Wei Loh, Jung Eun Kim · Nutrition Reviews · 2022
    Meta-analysis4 studies pooledSleep Support forTryptophan