L-Tryptophan 500 mg

L-Tryptophan 500 mg

Advanced Nutrition by Zahler4.6 (140 ratings)
Format:Capsule Quantity: 60 Capsule(s) · 60 servings
Goals
$19.47 $0.32 per serving
VitacostLowest$19.47Pure Formulas$19.47iHerb$22.64

Product analysis

45 out of 100

L-Tryptophan 500 mg may offer limited support for falling asleep through its role in making sleep-related messengers. The ingredient forms are not clearly identified, making comparisons harder.

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

Nutrient Quality20

Ingredient form quality remains uncertain because niacin and tryptophan forms are unspecified. Their listed amounts do not establish a form advantage.

Ingredient Transparency63

Both ingredient amounts are disclosed, helping you compare servings. Neither form is named, leaving the preparation less clearly described.

Value For Money40

Value cannot be judged confidently for either ingredient. The available information does not support a dependable cost comparison.

Customer Satisfaction70

Customer feedback is positive. The modest number of ratings offers a useful but limited satisfaction picture.

Product Focus55

Tryptophan has a possible role in sleep onset through production of sleep-related messengers. Direct everyday stress relief remains uncertain.

Format
Capsule
Container
60 Capsule(s)
Per serving
$0.32
Customer rating
4.6 · 140 ratings
Report analysis

Goals

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

Ingredients

IngredientAmount per servingScore
Vitamin B3
8.3 mg
L-Tryptophan
500 mg
Gluten Free Adults 18–50 Kosher Dairy Free 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

L-Tryptophan 500 mg

Swanson Ultra
Branded TryptoPure provides useful source-quality differentiation. 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.
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