L-Tryptophan 500 mg

L-Tryptophan 500 mg

Life Extension4.7 (1,806 ratings)
Format:Capsule Quantity: 90 Capsule(s) · 90 servings
Goals
$21.03 $0.23 per serving
AmazonLowest$21.03Vitacost$24.75iHerb$24.75Pure Formulas$24.75

Product analysis

47 out of 100

L-Tryptophan 500 mg takes a focused approach to possible sleep and mood-related support, with uncertain effects on everyday stress.

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

Nutrient Quality20

The detailed tryptophan form is unspecified. Its form quality therefore remains uncertain.

Ingredient Transparency63

The tryptophan amount is disclosed, making the quantity straightforward to check. The detailed form is unspecified, limiting comparisons of the preparation.

Value For Money40

Tryptophan value remains uncertain because a reliable cost comparison is unavailable. The known serving amount alone does not establish whether it offers good value.

Customer Satisfaction84

Customer ratings are strongly positive across a sizeable body of feedback. The review base gives useful context about satisfaction without proving sleep or stress effects.

Product Focus55

The formula centers on tryptophan's role in pathways related to sleep and mood. Direct everyday stress relief and reliable improvements in falling asleep remain uncertain.

Format
Capsule
Container
90 Capsule(s)
Per serving
$0.23
Customer rating
4.7 · 1,806 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
L-Tryptophan
500 mg
Adults 18–50
Report overview
83 Performance

L-Tryptophan 500 mg

Jarrow Formulas
The standalone L-form avoids competing amino acids, but source-grade details are not supplied. No unused eligible choice offers a clear across-the-board quality gain, so this represents a formulation trade-off rather than a definite upgrade.
82 Performance

L-Tryptophan Powder

NOW
The standalone powder avoids competing amino acids and allows flexible measuring. No unused eligible choice offers a clear across-the-board quality gain, so this represents a formulation trade-off rather than a definite upgrade.
82 Performance

Sleep Nighttime Powder

youtheory
Glycine, L-theanine, magnesium citrate, tryptophan, 5-HTP, and low-dose melatonin create a well-dosed nighttime formula. No unused eligible choice offers a clear across-the-board quality gain, so this represents a formulation trade-off rather than a definite upgrade.
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.
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.
83 Budget

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 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

L-Tryptophan 500 mg

Swanson Ultra
Branded TryptoPure provides useful source-quality differentiation. 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 may justify the higher supplied serving cost, though the value advantage depends on prioritizing the ingredient profile.
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