🟢 100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 50% of ingredients have research evidence
A Label Compliance Grade

Product Label

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Label Data

1 Capsule(s) Serving Size
60 Servings
Amino acid/Protein Product Type
50% Evidence Coverage

Supplement Facts — Evidence Check

8.3 mg (52% DV)
✅ Within RDA (0.6× RDA of 14 mg) 📚 193 studies (Tier A: 5, B: 63)
RDA 14mg This product: 8.3mg UL 35mg
500 mg
📊 Market median: 500.0mg (70 products)
Median 500.0mg This product: 500mg

Other Ingredients

Cellulose Magnesium Stearate Rice Flour

Label Claims — Verification

All Other
Structure/Function
All Other (100% of products) Structure/Function (90% of products) Nutrient (61% of products)

Target Groups

Vegetarian Adult (18 - 50 Years) Kosher Gluten Free Dairy Free

Product Information

📋 Directions for Use

Directions: Take 1 capsule daily, preferably without food, or as directed by a healthcare practitioner.

⚠️ Warnings & Precautions

Keep out of reach of children.

Do not use if safety seal is damaged or missing.

If pregnant, nursing or on medication, consult with your healthcare practitioner.

🧪 Formulation Notes

High potency serotonin enhancer

L-Tryptophan is used by the brain as a precursor to serotonin and melatonin, neurotransmitters that are necessary for normal sleep. Adequate sleep is crucial for healthy immune and nervous system function. In addition, changes in the level of serotonin in the brain can impact mood and satiety.

Kosher Pareve Under the strict supervision of Rabbi SH. Stern & the orthodox union

Non-GMO Gluten free Dairy free Soy free

Vegetarian friendly

Purified L-Tryptophan

High Potency Serotonin Enhancer Mind & spirit

500 mg per serving

Additional Information

You may need additional supplements to support a healthy diet; consult your nutritionist for a formula that is right for you or contact us at 877-ASK-ZAHLER (877-275-9245) or ask@zahlers.com.

Dairy (Kosher) OU (Kosher) This product was manufactured in a GMP certified Facility

Store tightly closed in a cool, dry place.

Made in the USA

Product Details

UPC / SKU 8 48998 08124 9
DSLD Entry Date 2022-04-11
Product Type Amino acid/Protein
Form Capsule
DSLD ID 260163
Data Updated 2026-04-11

Research Evidence

29 Research Sources
48 Avg Quality Score
19 Rct
5 Meta Analysis
3 Systematic Review
2 Clinical Trial
B Prebiotic and probiotic supplementation and the tryptophan-kynurenine pathway: A systematic review and meta analysis
Meta Analysis Neuroscience and biobehavioral reviews 2021
B Tryptophan and 5-hydroxytryptophan for depression
Systematic Review The Cochrane database of systematic reviews 2001
B Tryptophan and 5-hydroxytryptophan for depression
Systematic Review The Cochrane database of systematic reviews 2002
B The impact of tryptophan supplementation on sleep quality: a systematic review, meta-analysis, and meta-regression
Meta Analysis Nutrition reviews 2022
B No effects of acute tryptophan depletion on anxiety or mood in weight-recovered female patients with anorexia nervosa
Rct European archives of psychiatry and clinical neuroscience 2023
C The association between tryptophan levels and postpartum mood disorders: a systematic review and meta-analysis
Meta Analysis BMC psychiatry 2022
C A systematic review of the effect of L-tryptophan supplementation on mood and emotional functioning
Systematic Review Journal of dietary supplements 2021
C Comparison between Acupuncture and Nutraceutical Treatment with Migratens® in Patients with Fibromyalgia Syndrome: A Prospective Randomized Clinical Trial.
Rct Nutrients
C Intake of Lactiplantibacillus plantarum HEAL9 Improves Cognition in Moderately Stressed Subjects: A Randomized Controlled Study.
Rct Nutrients
C Are tryptophan and 5-hydroxytryptophan effective treatments for depression? A meta-analysis
Meta Analysis The Australian and New Zealand journal of psychiatry 2002
View all evidence for Tryptophan →

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