Overview
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
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.
4
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.
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.
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.
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.
Medical Researches
SCIENTIFIC SCORE
Likely Ineffective
Based on 2 Researches
4
- All Researches
4
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.
4
Insufficient evidence for L-theanine
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.
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.
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.
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.
Frequently Asked Questions
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.
8.8
Anxiety controlled
I purchased this for my mother, who has battled insomnia and depression for years. After a week on L-theanine, she feels calmer, with anxiety under control. I also commend iHerb for their excellent service; delivery to Vietnam was just a week!
2.5
Worse morning feelings
I suffer from insomnia, so I took this before bed for about ten days. Regrettably, I couldn’t sleep well and felt more tired and unsettled in the morning. This theanine isn't beneficial for everyone.
2.3
Ineffective treatment
I bought it to tackle insomnia, but it didn't help at all.
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.
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
Natural stress help
I used it to combat insomnia and stress. I took one at night with magnesium. It definitely has an effect. L-theanine is a natural emotional modulator, helping to reduce nervousness, relieve anxiety, and improve attention concentration. It's relaxing, not sedating, and enhances sleep quality when paired with magnesium.
8.3
Side-effect free
It helps with insomnia when taken before bed with magnesium and is much better than sleeping pills with no side effects.
8
Calm mind
I often take this with morning coffee to prevent jitters and enhance mental focus, yet occasionally use it before bed to alleviate anxiety and insomnia. At 150mg, it’s the perfect dosage for my needs.
4
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.
4
Insufficient evidence for L-theanine
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.
References
- Sarris J, Byrne GJ, Cribb L, Oliver G, Murphy J, et al. L-theanine in the adjunctive treatment of generalized anxiety disorder: A double-blind, randomised, placebo-controlled trial. J Psychiatr Res. 2019;110:31. doi:10.1016/j.jpsychires.2018.12.014
- Barrett JR, Tracy DK, Giaroli G. 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. J Child Adolesc Psychopharmacol. 2013;23:640. doi:10.1089/cap.2013.0059
