Source Naturals L-Tryptophan, 500 mg, 60 Capsules supplement bottle
Source Naturals

L-Tryptophan, 500 mg, 60 Capsules

What We Researched
1 active ingredient analyzed · 5 inactive ingredients decoded · 1 brand certification checked · 2 retailers compared · Last updated: Mar 2026
100
Product Score Excellent
66
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
L-Tryptophan (25 mg niacin equivalent) 1.5 g
Bioavailability Excellent

Absorption Rating

  • L-Tryptophan (25 mg niacin equivalent) Good
Other Ingredients Excellent

Fillers & Additives

  • Gelatin (Capsule)
  • Magnesium Stearate
  • Silica
  • Microcrystalline Cellulose
  • Dibasic Calcium Phosphate
Efficacy Excellent

Dosage Analysis

  • L-Tryptophan (25 mg niacin equivalent) 1.5 g Effective

Supplement Facts

Ingredient Amount % Daily Value
L-Tryptophan (25 mg niacin equivalent) 1.5 g

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Gelatin (Capsule) Safe

It is used as a material for making capsules.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Dibasic Calcium Phosphate Generally_safe

It is used as a filler and to improve tablet hardness.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$15$14$13$12$11 Mar 12 $13.00
iHerb

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Source Naturals

Founded 1982 · Scotts Valley, CA, USA · 837 products · sourcenaturals.com/

Certifications

1 certification
Fda Gmp Inspections Verified Source

Transparency

2 claims
Third Party Testing Claim — Claimed Source
In House Testing — Verified Source
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Frequently Asked Questions
Is Source Naturals L-Tryptophan, 500 mg a good supplement?

Source Naturals L-Tryptophan, 500 mg, 60 Capsules 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 with 20 servings per container. Of the 5 inactive ingredients, 4 are rated safe and 0 are flagged for review. The manufacturer, Source Naturals, holds a brand trust score of 66/100 with 1 verified certifications including Fda Gmp Inspections.

What are the ingredients in Source Naturals L-Tryptophan, 500 mg?

Source Naturals L-Tryptophan, 500 mg contains 1 active ingredients: L-Tryptophan (25 mg niacin equivalent) (1.5 g). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Source Naturals L-Tryptophan, 500 mg safe to take?

Source Naturals L-Tryptophan, 500 mg, 60 Capsules 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 Source Naturals a trustworthy supplement brand?

Source Naturals receives a brand trust score of 66/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1982 and headquartered in Scotts Valley, CA, USA, the company offers 837 products in their lineup. They hold 1 verified certifications including Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. No regulatory violations or FDA warning letters were found in our research.

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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. 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.