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No effect of tryptophan supplementation on attention or impulsivity in adults
In this randomized controlled trial, supplementation with tryptophan did not influence attention or impulsivity scores 1 hour later among participants with or without attention deficit hyperactivity disorder.
A limited-tryptophan/low-FODMAP diet for diarrhea-predominant irritable bowel syndrome
The effects of diet on sleep quality in trained athletes
L-tryptophan before bed improves the quality of sleep
Can a whey-protein and galacto-oligosaccharide-based supplement improve sleep quality?