A small placebo-controlled trial found improvements in some self-reported sleep measures after L-theanine, including time taken to fall asleep and sleep disturbance.†
What to keep in mind.
The trial used 200 mg of L-theanine per day. SLEEP lists 25 mg per gummy. A different dose and a different formula mean these results cannot be assumed for the finished gummy.
Participants rated their sleep quality more highly during a week of passionflower tea than during a week of placebo tea. Sleep quality was one of six diary measures assessed.†
What to keep in mind.
This was a short study of tea, not a gummy or the JUST. formula. Self-reported sleep quality does not establish a benefit for every aspect of sleep or for long-term use.
A review found a signal for improved subjective sleep quality in a subset of valerian trials, but most included studies had substantial methodological problems.†
What to keep in mind.
Doses, preparations, and study lengths varied, and the authors found evidence of publication bias. The findings are not proof that SLEEP or another valerian product will deliver the same result.