' 
SCIENTIFIC SCORE
Likely Ineffective
Based on 2 Researches
4
USERS' SCORE
Good
Based on 26 Reviews
8.3
Supplement Facts
Serving Size: 1 Veggie Capsule
Serving Per Container: 90
Amount Per Serving
%DV
L-Theanine (Suntheanine®)
150 mg
†
Top Medical Research Studies
4
Insufficient evidence for L-theanine
To sleep or not to sleep: a systematic review of the literature of pharmacological treatments of insomnia in children and adolescents with attention-deficit/hyperactivity disorder.
Research indicates limited effectiveness
We examined the effectiveness of various sleep medications, including L-theanine, for children and adolescents with ADHD. Out of 337 articles, only five were relevant.
While L-theanine showed some improvement in sleep efficiency, it did not significantly reduce sleep latency or increase overall sleep time. Other medications like clonidine and melatonin showed more promising results, reducing insomnia more effectively.
Overall, the lack of robust evidence for L-theanine suggests that more research is needed to confirm these findings and guide treatment options.
While L-theanine showed some improvement in sleep efficiency, it did not significantly reduce sleep latency or increase overall sleep time. Other medications like clonidine and melatonin showed more promising results, reducing insomnia more effectively.
Overall, the lack of robust evidence for L-theanine suggests that more research is needed to confirm these findings and guide treatment options.
Read More
4
L-theanine shows limited sleep benefits
L-theanine in the adjunctive treatment of generalized anxiety disorder: A double-blind, randomised, placebo-controlled trial.
Explored benefits of L-theanine
In our 10-week study with 46 participants diagnosed with Generalized Anxiety Disorder (GAD), we aimed to see if L-theanine could enhance sleep and reduce anxiety when combined with standard antidepressants.
While L-theanine didn’t significantly lower anxiety or insomnia severity compared to a placebo, participants on L-theanine did report feeling more satisfied with their sleep quality. Particularly, those experiencing non-clinical insomnia symptoms noted better outcomes.
These findings suggest that while L-theanine may not be a strong treatment for anxiety, it could have potential for improving sleep satisfaction.
While L-theanine didn’t significantly lower anxiety or insomnia severity compared to a placebo, participants on L-theanine did report feeling more satisfied with their sleep quality. Particularly, those experiencing non-clinical insomnia symptoms noted better outcomes.
These findings suggest that while L-theanine may not be a strong treatment for anxiety, it could have potential for improving sleep satisfaction.
Read More
Most Useful Reviews
9.5
Great for insomnia relief
I started taking Theanine to help with my insomnia. Previously, I had difficulty finding an effective solution, and my doctor wasn't helpful. After starting Theanine, the nightly 3 AM awakenings ceased, and I no longer experience joint pain. I also noticed a reduction in my high blood pressure after taking it. After a week, my knees felt better than they have in a year, prompting me to increase my intake frequency.
Read More
9.5
Natural remedy
At 27, I encountered insomnia for the first time. After thorough research, I found that amino acids can safely restore sleep. I take L-theanine with GABA and L-tryptophan at 8 pm, allowing relaxation before bed and enhancing melatonin production. This regimen helps me sleep soundly before my busy days. I truly appreciate the convenience and effectiveness of these small, easy-to-swallow capsules.
Read More
9.5
Much calmer
I follow my doctor's directions for insomnia and take one capsule at lunchtime. The result has been noticeably calmer days.
Read More
Medical Researches
SCIENTIFIC SCORE
Likely Ineffective
Based on 2 Researches
4
- All Researches
4
L-theanine shows limited sleep benefits
L-theanine in the adjunctive treatment of generalized anxiety disorder: A double-blind, randomised, placebo-controlled trial.
Explored benefits of L-theanine
In our 10-week study with 46 participants diagnosed with Generalized Anxiety Disorder (GAD), we aimed to see if L-theanine could enhance sleep and reduce anxiety when combined with standard antidepressants.
While L-theanine didn’t significantly lower anxiety or insomnia severity compared to a placebo, participants on L-theanine did report feeling more satisfied with their sleep quality. Particularly, those experiencing non-clinical insomnia symptoms noted better outcomes.
These findings suggest that while L-theanine may not be a strong treatment for anxiety, it could have potential for improving sleep satisfaction.
While L-theanine didn’t significantly lower anxiety or insomnia severity compared to a placebo, participants on L-theanine did report feeling more satisfied with their sleep quality. Particularly, those experiencing non-clinical insomnia symptoms noted better outcomes.
These findings suggest that while L-theanine may not be a strong treatment for anxiety, it could have potential for improving sleep satisfaction.
Read More
4
Insufficient evidence for L-theanine
To sleep or not to sleep: a systematic review of the literature of pharmacological treatments of insomnia in children and adolescents with attention-deficit/hyperactivity disorder.
Research indicates limited effectiveness
We examined the effectiveness of various sleep medications, including L-theanine, for children and adolescents with ADHD. Out of 337 articles, only five were relevant.
While L-theanine showed some improvement in sleep efficiency, it did not significantly reduce sleep latency or increase overall sleep time. Other medications like clonidine and melatonin showed more promising results, reducing insomnia more effectively.
Overall, the lack of robust evidence for L-theanine suggests that more research is needed to confirm these findings and guide treatment options.
While L-theanine showed some improvement in sleep efficiency, it did not significantly reduce sleep latency or increase overall sleep time. Other medications like clonidine and melatonin showed more promising results, reducing insomnia more effectively.
Overall, the lack of robust evidence for L-theanine suggests that more research is needed to confirm these findings and guide treatment options.
Read More
User Reviews
USERS' SCORE
Good
Based on 26 Reviews
8.3
- All Reviews
- Positive Reviews
- Negative Reviews
9.5
Great for insomnia relief
I started taking Theanine to help with my insomnia. Previously, I had difficulty finding an effective solution, and my doctor wasn't helpful. After starting Theanine, the nightly 3 AM awakenings ceased, and I no longer experience joint pain. I also noticed a reduction in my high blood pressure after taking it. After a week, my knees felt better than they have in a year, prompting me to increase my intake frequency.
Read More
9.5
Natural remedy
At 27, I encountered insomnia for the first time. After thorough research, I found that amino acids can safely restore sleep. I take L-theanine with GABA and L-tryptophan at 8 pm, allowing relaxation before bed and enhancing melatonin production. This regimen helps me sleep soundly before my busy days. I truly appreciate the convenience and effectiveness of these small, easy-to-swallow capsules.
Read More
9.5
Much calmer
I follow my doctor's directions for insomnia and take one capsule at lunchtime. The result has been noticeably calmer days.
9.5
Drastic improvement
A recommendation from Huberman remarkably eased my chronic insomnia of over four years. After trying various theanine versions, I found Suntheanine to be superior. It has no taste, which is an advantage, and the sleep benefits are remarkable.
8.3
Non-drug sleeping aid
Effective for my parents' insomnia. If you struggle to sleep without medication, please try it. Within 1 to 2 weeks, it doesn't act like sleeping pills, but when you lie down, sleep will come. I've never slept without medication before... You say you're a repeat buyer.
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