L-Tryptophan 1000 mg®
Amino Acids & ProteinBrand: Protocol For Life Balance
Functions
Net Contents
60 Tablet(s)
Serving Size
1 Tablet(s)
Servings Per Container
60
Supplement Form
Tablet or Pill
Bar Code (UPC/SKU)
7 07359 10169 2
Product Version
CODE P0169B V6
Label Analysis
Objective insights generated automatically from the official DSLD label — a quick, factual read of how this product is formulated and disclosed.
Single-ingredient formula listed in Supplement Facts.
Every active ingredient discloses a specific amount per serving.
Label states: Vegan, Vegetarian, Non-GMO, Gluten-Free.
This analysis is generated algorithmically from label data for educational reference only. It is not a product endorsement, ranking, or medical advice.
Supplement Facts
Serving Size: 1 Tablet(s) · 1–2 per day
| Ingredient | Amount Per Serving | |
|---|---|---|
| L-Tryptophan | 1000 mg | — |
Not Present
Other Ingredients
Target Groups
Label Claims
Directions & Suggested Use
Suggested/Recommended/Usage/Directions
Suggested usage: Take 1 tablet 1 to 2 times daily on an empty stomach, with final dose at bedtime, or as directed by your healthcare practitioner.
Warnings & Precautions
Precautions re: All Other
Cautions/interactions: Tryptophan supplements may interact with CNS depressants, antidepressants (SSRIs, MAOIs), and other serotonergic agents such as St. John's Wort and 5-HTP. May cause drowsiness. Do not use with alcoholic beverages or while operating heavy machinery.
Precautions re: Pregnant or Nursing or Prescription Medications
Consult your healthcare practitioner if you are taking medications or herbs, are pregnant/nursing, or if you have liver impairment.
Precautions re: Allergies
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Formulation
Formula re: Contains
How it works: Tryptophan is an essential amino acid; therefore, it is not synthesized by the body and must be obtained from the diet. In the brain, tryptophan is converted into serotonin, a neurotransmitter involved in feelings of well-being, calmness, personal security, and relaxation. It also plays a role in the regulation of appetite and synchronization of sleep patterns.
Formulation re: Does NOT Contain
Every lot of Protocol For Life Balance L-Tryptophan is tested to be free of peak E and microbial contamination.
Formulation re: Other
Encourages positive mood Supports relaxation & restful sleep
Formulation re: Does NOT Contain
Non-GMO
Formulation re: Vegetarian/Vegan
Vegetarian/vegan
Formulation re: Does NOT Contain
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients.
Formulation re: Other
Natural color variation may occur in this product.
FDA Statements
FDA Statement of Identity
A Dietary Supplement
FDA Disclaimer Statement
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Manufacturer & Distributor
Manufacturer
Protocol For Life Balance
395 S. Glen Ellyn Rd., Bloomingdale, IL, 60108, USA
Where to Buy Locally
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Research & Studies
… Amino Acid Supplementation Alone or Combined With Tryptophan or Methionine on Appetite Control and Related Health Outcomes in Older Adults: Protocol …
S Zhang, R Ribeiro, D Raubenheimer… - … Protocols, 2026 - researchprotocols.org
… In this paper, we have outlined the protocol for the study design, recruitment, collection, and processing of health assessment data related to the OptHealth study. As the global …
2026L-Tryptophan: Basic Metabolic Functions, Behavioral Research and Therapeutic Indications
DM Richard, MA Dawes, CW Mathias… - International …, 2009 - journals.sagepub.com
… healthy nutrition. While typical intake for many individuals is approximately 900 to 1000 mg daily… mg/day 5,12,13 and 425 mg/day, 4,14,15 which translates to a dietary intake of 3.5 to 6.0 …
2009981 citationsRole of tryptophan in health and disease: Systematic review of the anti-oxidant, anti-inflammation, and nutritional aspects of tryptophan and its metabolites
RB Singh - World Heart Journal, 2019 - search.proquest.com
… L-Tryptophan is an essential amino acid that is needed for the synthesis of proteins and … ranges are: L-tryptophan (50 -1,000 mg), serotonin/5HTP (50-100 mg), and melatonin (1-10 mg). …
201960 citationsOral tryptophan activates duodenal aryl hydrocarbon receptor in healthy subjects: a crossover randomized controlled trial
GH Rueda, N Causada-Calo… - American Journal …, 2024 - journals.physiology.org
… and washout periods, with an estimated amount of 1,000 mg l-tryptophan intake per day. … l-tryptophan supplementation, which is not surprising as this study was performed in healthy …
202430 citationsA systematic review of the effect of L-tryptophan supplementation on mood and emotional functioning
AM Kikuchi, A Tanabe, Y Iwahori - Journal of dietary supplements, 2021 - Taylor & Francis
… This systematic review includes 11 RCTs that examined the effects of TRP intake on positive and negative mood in healthy adult populations. We have targeted healthy adult men and …
2021109 citationsEFFECTS OF DIETARY L-TRYPTOPHAN SUPPLEMENTATION ON GROWTH, PHYSIOLOGY, IMMUNE RESPONSE, AND GENE EXPRESSION OF …
IJ Mishu - 2025 - hammer.purdue.edu
… can adversely affect their health, immunity, and general performance. This research investigated the impact of dietary L-tryptophan supplementation on physiological and immunological …
2025
Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2025-03-25. DSLD Label ID: 326452. This information is provided for educational reference only and is not medical advice. Always follow the product label and consult a doctor or pharmacist before use.
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