What is L-Theanine?
L-Theanine is a naturally occurring amino acid most commonly found in tea leaves. Unlike sedatives, it's associated with a calm, relaxed alertness rather than drowsiness during the day.
Why is it included in sleep formulas?
At night, that same calming quality — without heavy sedation — is used to help quiet a racing mind before bed, complementing melatonin's role in circadian signaling.
What does the research say?
L-theanine has been studied for its effects on relaxation and alpha brain wave activity. General background is available via the NIH Office of Dietary Supplements.
L-Theanine's role in Yu Sleep
At 200mg per serving, L-theanine works alongside GABA to calm mental activity, complementing melatonin's role in signaling sleep onset. See the full ingredient list.
Safety considerations
L-Theanine is generally well tolerated with minimal reported side effects. As with any supplement, consult a doctor before use if you take blood pressure medication.