The impact of tryptophan supplementation on sleep quality: a systematic review, meta-analysis, and meta-regression
Study link
https://pubmed.ncbi.nlm.nih.gov/33942088/
Health Goal
Sleep, Sleep Latency, Sleep Duration
Dietary Supplement
L-Tryptophan
Study Level
Meta-analysis
Optimisation and Validation of a Nutritional Intervention to Enhance Sleep Quality and Quantity
Study link
https://pubmed.ncbi.nlm.nih.gov/32854375/
Health Goal
Sleep, Sleep Latency, Sleep Duration
Dietary Supplement
L-Tryptophan
Study Level
Randomized, Controlled Clinical Trial
The serotonin transporter gene-linked polymorphic region (5-HTTLPR) and the sleep-promoting effects of tryptophan: A randomized placebo-controlled crossover study
Study link
https://pubmed.ncbi.nlm.nih.gov/31237183/
Health Goal
Sleep, Sleep Latency, Sleep Duration
Dietary Supplement
L-Tryptophan
Study Level
Randomized, Controlled Clinical Trial
L-tryptophan: effects on daytime sleep latency and the waking EEG
Study link
https://pubmed.ncbi.nlm.nih.gov/6189695/
Health Goal
Sleep, Sleep Latency, Sleep Duration
Dietary Supplement
L-Tryptophan
Study Level
Randomized, Controlled Clinical Trial