' 
SCIENTIFIC SCORE
Possibly Effective
Based on 16 Researches
7.6
USERS' SCORE
Good
Based on 169 Reviews
8.5
Supplement Facts
Serving Size: 1 Veggie Capsule
Serving Per Container: 90
Amount Per Serving
%DV
L-Theanine (Suntheanine®)
150 mg
†
Top Medical Research Studies
9
L-theanine supports mental health
Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.
Study shows significant benefits
This study evaluated the impact of four weeks of L-theanine on stress and cognitive function in 30 healthy adults. Participants received either 200 mg of L-theanine or a placebo in a double-blind setup. We observed significant reductions in anxiety and stress symptoms, as indicated by improved scores on various measures, including sleep quality. Additionally, cognitive functions, such as verbal fluency, showed notable enhancement after L-theanine use. These findings suggest that L-theanine may be beneficial for managing stress-related issues and boosting mental performance.
Read More
8
L-theanine effectively reduces anxiety
Effects of supplement L-theanine on cognitive anxiety, salivary alpha-amylase, and cortisol in archery competition.
High relevance to anxiety management
We explored the effects of L-theanine on cognitive anxiety among 18 female archery athletes during a national competition. The research measured anxiety levels using a simple scale, alongside saliva samples to assess markers like salivary alpha-amylase and cortisol.
Results showed that L-theanine significantly reduced cognitive anxiety just before the competition, as well as lowering other stress indicators in comparison to a placebo. Thus, we conclude that L-theanine can be a beneficial aid for athletes looking to manage competition-related anxiety effectively.
Results showed that L-theanine significantly reduced cognitive anxiety just before the competition, as well as lowering other stress indicators in comparison to a placebo. Thus, we conclude that L-theanine can be a beneficial aid for athletes looking to manage competition-related anxiety effectively.
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8
AlphaWave L-Theanine shows calming effects
A Randomized, Triple-Blind, Placebo-Controlled, Crossover Study to Investigate the Efficacy of a Single Dose of AlphaWave L-Theanine on Stress in a Healthy Adult Population.
High relevance for stress relief
We conducted a thorough study to see if AlphaWave L-Theanine could reduce stress in healthy adults. This randomized, triple-blind, placebo-controlled trial used a mental arithmetic test to create stress before and after participants received either a 200 mg dose of L-Theanine or a placebo.
Remarkably, our results showed that one dose of L-Theanine significantly boosted brain activity linked to relaxation during stress, indicating it could be an effective calming agent. Importantly, it was also safe for all participants involved.
Remarkably, our results showed that one dose of L-Theanine significantly boosted brain activity linked to relaxation during stress, indicating it could be an effective calming agent. Importantly, it was also safe for all participants involved.
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Most Useful Reviews
9.5
Effective for anxiety
Surprisingly helpful. I have tried multiple L-Theanine brands, but Doctor's Best is the only one that works for me. Five years ago, I was advised to use L-Theanine for anxiety, but other brands did nothing for me. This year, I purchased Doctor's Best and finished the entire bottle, as it significantly improved my anxiety. I have panic disorder and recently managed a road trip by using this supplement instead of my prescribed medication, which often makes me groggy. I recommend giving it a try if you experience anxiety.
Read More
9.5
Immediate relaxation
L-theanine is simply an indispensable tool in my first aid kit. It instantly reduces anxiety, enhances cognitive functions and leaves me feeling relaxed, almost as if I were on holiday. I genuinely appreciate its effects!
Read More
9.5
Enhanced productivity
An absolutely amazing product! It calms my mind and helps me focus better. It reduces anxiety and assists me in overcoming overwhelming situations. When combined with Doctor's Best L-Tryptophan, I've experienced the best sleep ever. My entire office is on this product and I’ve noticed improved productivity. My family also loves it. Doctor's Best truly offers the finest products.
Read More
Medical Researches
SCIENTIFIC SCORE
Possibly Effective
Based on 16 Researches
7.6
- All Researches
9
l-Theanine shows promise against THC
l-Theanine Prevents Long-Term Affective and Cognitive Side Effects of Adolescent Δ-9-Tetrahydrocannabinol Exposure and Blocks Associated Molecular and Neuronal Abnormalities in the Mesocorticolimbic Circuitry.
High relevance for neuroprotective research
We investigated the effects of l-theanine, an amino acid found in green tea, on the negative side effects of adolescent THC exposure. Our research used a preclinical model with male rats to see if l-theanine could prevent long-term behavioral and cognitive issues linked to THC exposure.
Findings showed that l-theanine effectively blocked these adverse effects, protecting brain function and regulating important neurotransmitter pathways. As cannabis use grows among adolescents, our study highlights l-theanine's potential as a protective treatment to minimize THC-induced risks.
Findings showed that l-theanine effectively blocked these adverse effects, protecting brain function and regulating important neurotransmitter pathways. As cannabis use grows among adolescents, our study highlights l-theanine's potential as a protective treatment to minimize THC-induced risks.
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9
Amino acids improve mood disorders
Innovative therapies for mood disorders: A case report.
Promising nutritional intervention results
We examined the role of targeted amino acid therapy, including l-theanine, in addressing mood disorders like anxiety and depression. Our case study focused on a 26-year-old woman with complex mental health challenges who, after struggling with conventional treatments, engaged in a personalized nutrition intervention. Over 12 weeks, she followed a tailored program that emphasized amino acids and specific nutrients.
The results were promising, showing significant improvement in her anxiety, depression, and other related symptoms. This suggests that integrating nutritional therapies may offer new hope for those affected by mood disorders.
The results were promising, showing significant improvement in her anxiety, depression, and other related symptoms. This suggests that integrating nutritional therapies may offer new hope for those affected by mood disorders.
Read More
9
L-theanine supports mental health
Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.
Study shows significant benefits
This study evaluated the impact of four weeks of L-theanine on stress and cognitive function in 30 healthy adults. Participants received either 200 mg of L-theanine or a placebo in a double-blind setup. We observed significant reductions in anxiety and stress symptoms, as indicated by improved scores on various measures, including sleep quality. Additionally, cognitive functions, such as verbal fluency, showed notable enhancement after L-theanine use. These findings suggest that L-theanine may be beneficial for managing stress-related issues and boosting mental performance.
Read More
8
L-theanine reduces anxiety effectively
Comparison of the effects of two amino acids, Gamma-aminobutyric acid (GABA) and L-theanine, on sedation, anxiety, and cognition in preoperative surgical patients - A randomized controlled study.
Highly relevant for preoperative care
We explored the impact of L-theanine and GABA on anxiety levels in preoperative surgical patients. In a randomized controlled study involving 168 participants, we compared the effects of these amino acids with that of a common sedative, alprazolam.
Our findings showed that both L-theanine and GABA effectively reduced preoperative anxiety while causing minimal sedation and even enhancing cognitive performance. This suggests that L-theanine might be a safe alternative to traditional anxiolytics for managing anxiety before surgery.
Our findings showed that both L-theanine and GABA effectively reduced preoperative anxiety while causing minimal sedation and even enhancing cognitive performance. This suggests that L-theanine might be a safe alternative to traditional anxiolytics for managing anxiety before surgery.
Read More
8
L-theanine effectively reduces anxiety
Effects of supplement L-theanine on cognitive anxiety, salivary alpha-amylase, and cortisol in archery competition.
High relevance to anxiety management
We explored the effects of L-theanine on cognitive anxiety among 18 female archery athletes during a national competition. The research measured anxiety levels using a simple scale, alongside saliva samples to assess markers like salivary alpha-amylase and cortisol.
Results showed that L-theanine significantly reduced cognitive anxiety just before the competition, as well as lowering other stress indicators in comparison to a placebo. Thus, we conclude that L-theanine can be a beneficial aid for athletes looking to manage competition-related anxiety effectively.
Results showed that L-theanine significantly reduced cognitive anxiety just before the competition, as well as lowering other stress indicators in comparison to a placebo. Thus, we conclude that L-theanine can be a beneficial aid for athletes looking to manage competition-related anxiety effectively.
Read More
User Reviews
USERS' SCORE
Good
Based on 169 Reviews
8.5
- All Reviews
- Positive Reviews
- Negative Reviews
9.5
Effective for anxiety
Surprisingly helpful. I have tried multiple L-Theanine brands, but Doctor's Best is the only one that works for me. Five years ago, I was advised to use L-Theanine for anxiety, but other brands did nothing for me. This year, I purchased Doctor's Best and finished the entire bottle, as it significantly improved my anxiety. I have panic disorder and recently managed a road trip by using this supplement instead of my prescribed medication, which often makes me groggy. I recommend giving it a try if you experience anxiety.
Read More
9.5
Immediate relaxation
L-theanine is simply an indispensable tool in my first aid kit. It instantly reduces anxiety, enhances cognitive functions and leaves me feeling relaxed, almost as if I were on holiday. I genuinely appreciate its effects!
9.5
Enhanced productivity
An absolutely amazing product! It calms my mind and helps me focus better. It reduces anxiety and assists me in overcoming overwhelming situations. When combined with Doctor's Best L-Tryptophan, I've experienced the best sleep ever. My entire office is on this product and I’ve noticed improved productivity. My family also loves it. Doctor's Best truly offers the finest products.
Read More
9.5
Natural anxiety relief
Natural alternative to anxiety medication. This is a fantastic natural substitute for anxiety medication. It alleviates the stress from everyday living, helping me navigate my day with fewer worries. I take it alongside Calms Forte by Hylands, and together, they truly calm me without causing sleepiness. After discontinuing anxiety meds prescribed by my doctor, I experienced withdrawal, and these two products were a Godsend for the chemical side effects. I needed them to manage my anxiety during that challenging time. A Naturopath recommended them for withdrawal assistance and future anxiety. They helped me immediately and have made a notable difference in my overall wellbeing.
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10
Panic attack relief
Saved me—can't live without them. Having suffered from generalised anxiety and panic attacks for 25 years, this L-Theanine has nearly eliminated my panic and anxiety episodes. I still experience generalised anxiety, but it has significantly diminished. I take two every five hours during the day without any side effects. It simply calms my internal turmoil, allowing me to find peace without feeling foggy. Though I occasionally still have anxiety attacks, they have reduced drastically. I highly recommend this product for anyone with anxiety.
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