Scan another →

Douglas Laboratories L-Tryptophan

4 established essential nutrients

Graded on the nutrient adequacy of 4 labeled ingredients.

A
81out of 100Grade A
Research evidence score

Graded on 4 established essential nutrients · led by Vitamin C

Strong pick. Vitamin C, Riboflavin and Niacin (+1 more) have real research behind them.

Based on the ingredients we could read from this scan. A full label may include more — like added sugars, colorings or other ingredients — than we captured here.

How the ingredients work together

Known interactions from published nutrition research — separate from the evidence grade.

33 of 4 nutrients at a meaningful dose (≥20% Daily Value) — the other 1 are present at low levels.
Compare with another product

Ingredient breakdown

C
Vitamin CSupports immune function and antioxidant defense
Research: Established essential nutrientDaily Value: 11%Dose: 10 mgEvidence strength: Established nutrient — a modest dose in this product
A
RiboflavinSupports cellular energy production and antioxidant defense
Research: Established essential nutrientDaily Value: 769%Dose: 10 mgEvidence strength: Established nutrient — this product provides a meaningful dose
A
NiacinSupports cholesterol metabolism and cellular energy
Research: Established essential nutrientDaily Value: 63%Dose: 10 mgEvidence strength: Established nutrient — this product provides a meaningful dose
A
Vitamin B6Supports energy metabolism and neurotransmitter synthesis
Research: Established essential nutrientDaily Value: 588%Dose: 10 mgEvidence strength: Established nutrient — this product provides a meaningful dose

This summary describes only the ingredients and the research behind them — it is not a judgment of the product or its marketing. Grades reflect the weight of published evidence cross-referenced against 350M+ research papers. How we grade →

Check what's really in your products

Scan any label and see what the research actually says.

Scan a product