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Self-experiment with L-theanine: effect on sleep and cognition
The supplement seems to have a small effect, but overall is not a game-changer for me Many supplements are said to improve sleep, but how can I know if they work for my individual case if the effects are not obvious? To answer this, I ran a self-experiment with L-theanine using this platform. L-theanine, commonly described as an aid to relaxation, is a non-protein amino acid that can most easily be found in green tea.
The effects of L-theanine (Suntheanine®) on objective sleep quality in boys with attention deficit hyperactivity disorder (ADHD): a randomized, double-blind, placebo-controlled clinical trial. [6] “L-Theanine intake resulted in a reduction in the heart rate (HR) and salivary immunoglobulin A (s-IgA) responses to an acute stress task relative to the placebo control condition.” See: https://pubmed.ncbi.nlm.nih.gov/16930802/ The oral administration of GABA/l-theanine mixture improved sleep time and quality, as compared to GABA or l-theanine alone.” See: Kim S, Jo K, Hong KB, Han SH, Suh HJ.
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