L-Theanine for Irritability / Anger
Amino acid from tea leaves that crosses the blood-brain barrier and increases alpha-wave brain activity; promotes calm alertness without sedation, often paired with caffeine.
The connection
Persistent low frustration tolerance, quick temper, or emotional reactivity that affects relationships.
Also known as: Theanine, L-gamma-glutamylethylamide
L-Theanine × Irritability / Anger: at a glance
Every published result for this pair, extracted and audited.
L-Theanine / Irritability / Anger: publication years
What this means: Counts describe research quantity, not treatment effectiveness or certainty.
| Category | Publications (count) |
|---|---|
| 2017 | 1 |
| 2020 | 1 |
| 2022 | 1 |
| 2023 | 1 |
| 2024 | 1 |
| 2025 | 1 |
L-Theanine × Irritability / Anger: the evidence base
Hand-selected PubMed studies, linked to the originals.
Ordered by strength of evidence, then result direction.
01Efficiency of Different Supplements in Alleviating Symptoms of ADHD with or Without the Use of Stimulants: A Systematic ReviewAl Shahab S, et al. · Nutrients · 2025PMID 40362791 ↗02The effects of L-theanine supplementation on the outcomes of patients with mental disorders: a systematic reviewMoshfeghinia R, et al. · BMC psychiatry · 2024PMID 39633316 ↗03Association between sleep pattern and pharmacological treatment in children with attention deficit disorder with hyperactivity: a systematic reviewRocha NS, et al. · Revista paulista de pediatria : orgao oficial da Sociedade de Pediatria de Sao Paulo · 2023PMID 37255110 ↗04Medicinal herbs for the treatment of anxiety: A systematic review and network meta-analysisZhang W, et al. · Pharmacological research · 2022PMID 35378276 ↗05The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic ReviewWilliams JL, et al. · Plant foods for human nutrition (Dordrecht, Netherlands) · 2020PMID 31758301 ↗06Safety, Tolerability and Efficacy of Drugs for Treating Behavioural Insomnia in Children with Attention-Deficit/Hyperactivity Disorder: A Systematic Review with Methodological Quality AssessmentAnand S, et al. · Paediatric drugs · 2017PMID 28391425 ↗Community experiences
Contributors volunteered; this does not establish treatment effectiveness or population incidence.
Reported changes
No publishable community breakdown is available. This does not establish that no reports exist.