Strong evidenceamino_acid
L-Theanine for Insomnia
L-theanine promotes alpha brain wave production, facilitating the transition from wakefulness to sleep. It increases GABA and serotonin levels while reducing excitatory glutamate, creating a neurochemical environment conducive to sleep onset.
How strong is the research?
Strong evidence
Based on a randomised controlled trial (RCT) — the gold standard for establishing cause and effect.
How much to take
200–400 mg
Promotes relaxation without sedation. Safe to use nightly. Can be combined with magnesium for enhanced effect.