Doctor's Best L-Tryptophan
vs
Source Naturals L-Tryptophan
Supplement Comparison

Amino Acid Formula. Sleep Formula.

Serving size: - Doctor's Best L-Tryptophan: 1 capsule - Source Naturals L-Tryptophan: 3 capsules

L-Tryptophan: Source Naturals L-Tryptophan has 3.0× more
The image below shows:
- Side-by-side charts with label nutrient amounts, per serving
- Nutrient forms as listed on the label
- 1 nutrients compared

Frequently asked questions

Source Naturals L-Tryptophan has the highest total amount of L-Tryptophan: 1500 mg per serving

Serving size:
- Doctor's Best L-Tryptophan: 1 capsule
- Source Naturals L-Tryptophan: 3 capsules

Last updated: February 3, 2026

Sources & Methodology: Nutrient data and forms are taken directly from Supplement Facts labels. Reviewed and standardized by the VIOscan Research Team. Learn more on the Methodology page.
We show the Recommended Dietary Allowance (RDA) when available. If no RDA exists, we show the Adequate Intake (AI). Tolerable Upper Intake Levels (UL) are used for upper limits. Unless otherwise noted, RDAs shown correspond to healthy adults aged 19–50 years and are sex-specific. Separate values exist for 51–70 years and >70 years, and pregnancy and lactation are excluded. All values come from the Dietary Reference Intakes (DRIs) published by the National Academies of Sciences, Engineering, and Medicine (NASEM), Food and Nutrition Board (FNB).
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This analysis is for educational purposes only. It is not a substitute for medical advice.
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Author: VIOscan Research Team