Last update
4/30/2026
Reviewed By
Overview
SCIENTIFIC SCORE
Questionable
Based on 3 Researches
5
USERS' SCORE
Moderately Good
Based on 11 Reviews
7.1
Supplement Facts
Serving Size: 1 Veg Capsule
Amount Per Serving
%DV
L-Theanine
100 mg
**
Decaffeinated Green Tea (Camellia sinensis) (Leaf)
250 mg
**
Top Medical Research Studies
7
We set out to explore how long-term consumption of green tea could influence insomnia among postmenopausal women, a group known to face higher risks of depression and sleep disturbances. In our investigation, we had the opportunity to look at 386 women living in a tea-producing village. We divided them into two groups: one that regularly consumed green tea and a control group that did not.
Our findings revealed noteworthy differences between the two groups in several aspects, including the degree of insomnia. We observed that those who consumed green tea experienced less insomnia, suggesting that this delightful beverage might help improve sleep quality. Additionally, the study indicated that green tea consumption could be linked to positive changes in inflammation and estradiol levels, which might also play a role in enhancing overall well-being.
In summary, integrating green tea into the daily routine of postmenopausal women may offer a natural way to help diminish insomnia symptoms. This is a promising step toward promoting healthier lifestyles for women in this stage of life.
Our findings revealed noteworthy differences between the two groups in several aspects, including the degree of insomnia. We observed that those who consumed green tea experienced less insomnia, suggesting that this delightful beverage might help improve sleep quality. Additionally, the study indicated that green tea consumption could be linked to positive changes in inflammation and estradiol levels, which might also play a role in enhancing overall well-being.
In summary, integrating green tea into the daily routine of postmenopausal women may offer a natural way to help diminish insomnia symptoms. This is a promising step toward promoting healthier lifestyles for women in this stage of life.
Read More
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.
Read More
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.
Read More
Most Useful Reviews
9
Effective natural remedy
20 people found this helpful
The best natural product for insomnia I have ever used. I wake up slightly sleepy, but this passes after a shower. The calming effect lasts throughout the day, making my mind less cluttered and more focused. Definitely a keeper.
Read More
0
Negative effects experienced
16 people found this helpful
I had a paradoxical reaction which seems to be more common than I thought. Although this product works wonders for many, it worsened my insomnia and caused dizziness and a sense of sadness that I wouldn’t quite classify as depression. While it did improve my focus, I lacked the mental clarity I desired. I managed to finish two tedious tasks in three days, but that minor benefit didn’t outweigh the negatives for me. I’ll keep searching for something better.
Read More
9
Natural insomnia relief
2 people found this helpful
This natural product really assists with my insomnia.
Read More
Medical Researches
SCIENTIFIC SCORE
Questionable
Based on 3 Researches
5
- All Researches
7
We set out to explore how long-term consumption of green tea could influence insomnia among postmenopausal women, a group known to face higher risks of depression and sleep disturbances. In our investigation, we had the opportunity to look at 386 women living in a tea-producing village. We divided them into two groups: one that regularly consumed green tea and a control group that did not.
Our findings revealed noteworthy differences between the two groups in several aspects, including the degree of insomnia. We observed that those who consumed green tea experienced less insomnia, suggesting that this delightful beverage might help improve sleep quality. Additionally, the study indicated that green tea consumption could be linked to positive changes in inflammation and estradiol levels, which might also play a role in enhancing overall well-being.
In summary, integrating green tea into the daily routine of postmenopausal women may offer a natural way to help diminish insomnia symptoms. This is a promising step toward promoting healthier lifestyles for women in this stage of life.
Our findings revealed noteworthy differences between the two groups in several aspects, including the degree of insomnia. We observed that those who consumed green tea experienced less insomnia, suggesting that this delightful beverage might help improve sleep quality. Additionally, the study indicated that green tea consumption could be linked to positive changes in inflammation and estradiol levels, which might also play a role in enhancing overall well-being.
In summary, integrating green tea into the daily routine of postmenopausal women may offer a natural way to help diminish insomnia symptoms. This is a promising step toward promoting healthier lifestyles for women in this stage of life.
Read More
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.
Read More
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.
Read More
User Reviews
USERS' SCORE
Moderately Good
Based on 11 Reviews
7.1
- All Reviews
- Positive Reviews
- Negative Reviews
9
Effective natural remedy
20 people found this helpful
The best natural product for insomnia I have ever used. I wake up slightly sleepy, but this passes after a shower. The calming effect lasts throughout the day, making my mind less cluttered and more focused. Definitely a keeper.
Read More
0
Negative effects experienced
16 people found this helpful
I had a paradoxical reaction which seems to be more common than I thought. Although this product works wonders for many, it worsened my insomnia and caused dizziness and a sense of sadness that I wouldn’t quite classify as depression. While it did improve my focus, I lacked the mental clarity I desired. I managed to finish two tedious tasks in three days, but that minor benefit didn’t outweigh the negatives for me. I’ll keep searching for something better.
Read More
9
Natural insomnia relief
2 people found this helpful
This natural product really assists with my insomnia.
Read More
9
Effective treatment
1 people found this helpful
After a troubling family incident, I found myself wide awake in the middle of the night, unable to sleep. However, just 20 minutes after taking one capsule, I felt calmer and managed to drift off to sleep.
Read More
9
Recommended with caution
Definitely recommended for treating insomnia, especially when combined with 5-HTP for a synergistic effect. I enjoy great sleep and vivid dreams when using these alongside 'Only Trace minerals'.
Read More
Frequently Asked Questions
9
Effective treatment
1 people found this helpful
After a troubling family incident, I found myself wide awake in the middle of the night, unable to sleep. However, just 20 minutes after taking one capsule, I felt calmer and managed to drift off to sleep.
9
Effective natural remedy
20 people found this helpful
The best natural product for insomnia I have ever used. I wake up slightly sleepy, but this passes after a shower. The calming effect lasts throughout the day, making my mind less cluttered and more focused. Definitely a keeper.
9
Recommended with caution
Definitely recommended for treating insomnia, especially when combined with 5-HTP for a synergistic effect. I enjoy great sleep and vivid dreams when using these alongside 'Only Trace minerals'.
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.
7
We set out to explore how long-term consumption of green tea could influence insomnia among postmenopausal women, a group known to face higher risks of depression and sleep disturbances. In our investigation, we had the opportunity to look at 386 women living in a tea-producing village. We divided them into two groups: one that regularly consumed green tea and a control group that did not.
Our findings revealed noteworthy differences between the two groups in several aspects, including the degree of insomnia. We observed that those who consumed green tea experienced less insomnia, suggesting that this delightful beverage might help improve sleep quality. Additionally, the study indicated that green tea consumption could be linked to positive changes in inflammation and estradiol levels, which might also play a role in enhancing overall well-being.
In summary, integrating green tea into the daily routine of postmenopausal women may offer a natural way to help diminish insomnia symptoms. This is a promising step toward promoting healthier lifestyles for women in this stage of life.
Our findings revealed noteworthy differences between the two groups in several aspects, including the degree of insomnia. We observed that those who consumed green tea experienced less insomnia, suggesting that this delightful beverage might help improve sleep quality. Additionally, the study indicated that green tea consumption could be linked to positive changes in inflammation and estradiol levels, which might also play a role in enhancing overall well-being.
In summary, integrating green tea into the daily routine of postmenopausal women may offer a natural way to help diminish insomnia symptoms. This is a promising step toward promoting healthier lifestyles for women in this stage of life.
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. 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. 10.1089/cap.2013.0059
- Wan Z, Qin X, Tian Y, Ouyang F, Wang G, et al. Long-Term Consumption of Green Tea Can Reduce the Degree of Depression in Postmenopausal Women by Increasing Estradiol. Nutrients. 2023;15. 10.3390/nu15214514
