is an , and is one of the main active components of . It is similar in structure to the , and is known to reach the brain following ingestion.
appears to induce relaxation without sedation, and may somewhat reduce anxiety. This means that it may be helpful for ”taking the edge off” stimulants such as caffeine.
Secondary to its relaxation effect,may aid sleep quality, though this effect appears to be quite weak.
may also improve attention, and so it may have a role to play as a cognition-enhancing supplement.
Studies suggest that self-reported relaxation and relaxation as measured by alpha waves in the brain. These effects appear to occur 30 minutes to an hour after ingestion. does not appear to reduce anticipatory anxiety. While the magnitude of the ‘s relaxing effect is notable, the caveat is that these studies were few and were quite small.can improve
improve attention task performance and reaction time. A recent double-blind, placebo-controlled study supports this finding and suggests that this effect is dose-dependent. However, the first of these studies suggests that might only improve attention in those who experience baseline levels of anxiety.appears to
Examine.com: L-Theanine: https://examine.com/supplements/theanine/#
The acute effects of L-theanine in comparison with alprazolam on anticipatory anxiety in humans: https://doi.org/10.1002/hup.611
Effects of l-theanine on attention and reaction time response: https://doi.org/10.1016/j.jff.2011.03.009
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: https://pubmed.ncbi.nlm.nih.gov/22214254/
L-theanine improves neurophysiological measures of attention in a dose-dependent manner: a double-blind, placebo-controlled, crossover study: DOI: 10.1080/1028415X.2020.1804098
Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial: DOI: 10.3390/nu11102362