NOW L-Tryptophan, 1,000 mg supplement bottle
NOW

L-Tryptophan, 1,000 mg Review

What We Researched
1 active ingredient analyzed · 12 inactive ingredients decoded · 9 brand certifications checked · Last updated: Aug 2026
100
Product Score Excellent
100
Brand Score Excellent

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
L-Tryptophan (Free-Form) (1,000 mg) 1 g *
Bioavailability Excellent

Absorption Rating

  • L-Tryptophan (Free-Form) (1,000 mg) Good
Other Ingredients Excellent

Fillers & Additives

  • Croscarmellose Sodium
  • Vegetable Magnesium Stearate
  • Calcium Carbonate
  • Hypromellose
  • Magnesium Stearate
  • Hydroxypropyl Cellulose
  • Vegetable Stearic Acid
  • Glycerin
  • Stearic Acid
  • Silica
  • Vegetarian Coating
  • Silicon Dioxide
Efficacy Excellent

Dosage Analysis

  • L-Tryptophan (Free-Form) (1,000 mg) 1 g Effective

Supplement Facts

Ingredient Amount % Daily Value
L-Tryptophan (Free-Form) (1,000 mg) 1 g *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Vegetable Magnesium Stearate Safe

Prevents ingredients from sticking to equipment. Derived from vegetable sources.

Calcium Carbonate Safe

Acts as a filler and provides supplemental calcium.

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Hydroxypropyl Cellulose Safe

Binds tablet ingredients and can form tablet coatings.

Vegetable Stearic Acid Generally_safe

It is used to prevent ingredients from sticking to manufacturing equipment.

Glycerin Safe

Retains moisture and helps dissolve ingredients in softgels and liquids.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Vegetarian Coating Generally_safe

It is added to coat tablets or capsules.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Brand Trust Report
NOW

Founded 1968 · Bloomingdale, Illinois, USA · 1759 products · nowfoods.com

Certifications

9 certifications
Informed Sport Verified Source
Npa Gmp Verified Source
Consumerlab Verified Source
Labdoor Verified Source
Fda Gmp Inspections Verified Source
Non Gmo Project Verified Source
Usda Organic Verified Source
Vegan Certified Verified Source
Informed Choice Verified

Transparency

5 claims
Coa Availability — Verified Source
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Claimed
In House Testing — Verified Source

Violation History

8 incidents
Lawsuit Mislabeled St. John's Wort supplement, containing significantly less of the active ingredient than advertised.NoneSource
Lawsuit A data breach that compromised personal and health information of employees and dependents.2023Source
Prop 65 Lead2021-11-30Source
Recall NOW Real Food® Raw Macadamia Nuts2020-06-12Source
Recall NOW Real Food® Raw Macadamia Nuts2020-06-12Source
Recall NOW Real Food® Zesty Sprouting Mix2018-06-21Source
Lawsuit Misleadingly using slack-fill packaging for their Vitamin C supplements.2015Source
Fda Warning Adulterated Dietary Supplement due to pesticide (quintozene) contamination in American Ginseng.2007-10-12Source
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Frequently Asked Questions
Is NOW L-Tryptophan, 1 a good supplement?

NOW L-Tryptophan, 1,000 mg received a product quality score of 100/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 1 active ingredients Of the 12 inactive ingredients, 10 are rated safe and 0 are flagged for review. The manufacturer, NOW, holds a brand trust score of 100/100 with 9 verified certifications including Informed Sport, Npa Gmp, Consumerlab, Labdoor.

What are the ingredients in NOW L-Tryptophan, 1?

NOW L-Tryptophan, 1 contains 1 active ingredients: L-Tryptophan (Free-Form) (1,000 mg) (1 g). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is NOW L-Tryptophan, 1 safe to take?

NOW L-Tryptophan, 1,000 mg has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is NOW a trustworthy supplement brand?

NOW receives a brand trust score of 100/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1968 and headquartered in Bloomingdale, Illinois, USA, the company offers 1759 products in their lineup. They hold 9 verified certifications including Informed Sport, Npa Gmp, Consumerlab, Labdoor. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: NOW has 8 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.