Last update
8/28/2025
Reviewed By
Reviewed By
Overview
SCIENTIFIC SCORE
Likely Very Effective
Based on 1 Research
9
USERS' SCORE
Good
Based on 16 Reviews
8.4
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
9
This study explored how L-theanine can influence the effects of cuprizone-induced multiple sclerosis in mice.
We observed that when L-theanine was administered alongside cuprizone, it improved locomotor functions and reduced damage typically caused by the disorder.
Notably, mice receiving L-theanine showed enhancements in ambulation and grip strength compared to the control group.
While the study indicates potential benefits of L-theanine, further research is necessary to fully understand its effectiveness in human autoimmune conditions.
We observed that when L-theanine was administered alongside cuprizone, it improved locomotor functions and reduced damage typically caused by the disorder.
Notably, mice receiving L-theanine showed enhancements in ambulation and grip strength compared to the control group.
While the study indicates potential benefits of L-theanine, further research is necessary to fully understand its effectiveness in human autoimmune conditions.
Read More
Most Useful Reviews
8
Reduced anxiety
26 people found this helpful
It works from stress. L-Theanine with Green Tea is intended to reduce stress and side effects. Together with caffeine, it soothes and invigorates. I noticed a real effect on myself: it gives strength, improves my mood, and fear no longer bothers me as much as before. Once, I took theanine before a driving test, and remarkably, the fear diminished, allowing my mind to be clearer. As a result, I passed! I want to order more, as I find it truly beneficial.
Read More
9
Stress reduction
12 people found this helpful
L-Theanine is a unique amino acid found mainly in tea plants and is shown to reduce stress, improve sleep quality, and lessen symptoms of PMS. I take 100mg before bed, and my sleep has greatly improved; I now recall my dreams vividly, indicating deeper sleep. For those with metabolic disorders or sleep issues, I recommend L-Theanine, as it's crucial for sleep recovery. It synergises well with melatonin.
Read More
9
Mental stability
11 people found this helpful
As someone who has battled severe sleep disorders for years, I managed to stop my medication with the help of iHerb's melatonin and theanine. This product has demonstrably aided my sleep and mental stability. The delightful aroma of decaffeinated green tea adds to its appeal. The tranquil effects are noticeable both day and night, sharpening my focus, even when paired with coffee. It's an excellent product, albeit slightly pricey.
Read More
Medical Researches
SCIENTIFIC SCORE
Likely Very Effective
Based on 1 Research
9
- All Researches
9
This study explored how L-theanine can influence the effects of cuprizone-induced multiple sclerosis in mice.
We observed that when L-theanine was administered alongside cuprizone, it improved locomotor functions and reduced damage typically caused by the disorder.
Notably, mice receiving L-theanine showed enhancements in ambulation and grip strength compared to the control group.
While the study indicates potential benefits of L-theanine, further research is necessary to fully understand its effectiveness in human autoimmune conditions.
We observed that when L-theanine was administered alongside cuprizone, it improved locomotor functions and reduced damage typically caused by the disorder.
Notably, mice receiving L-theanine showed enhancements in ambulation and grip strength compared to the control group.
While the study indicates potential benefits of L-theanine, further research is necessary to fully understand its effectiveness in human autoimmune conditions.
Read More
User Reviews
USERS' SCORE
Good
Based on 16 Reviews
8.4
- All Reviews
- Positive Reviews
- Negative Reviews
8
Reduced anxiety
26 people found this helpful
It works from stress. L-Theanine with Green Tea is intended to reduce stress and side effects. Together with caffeine, it soothes and invigorates. I noticed a real effect on myself: it gives strength, improves my mood, and fear no longer bothers me as much as before. Once, I took theanine before a driving test, and remarkably, the fear diminished, allowing my mind to be clearer. As a result, I passed! I want to order more, as I find it truly beneficial.
Read More
9
Stress reduction
12 people found this helpful
L-Theanine is a unique amino acid found mainly in tea plants and is shown to reduce stress, improve sleep quality, and lessen symptoms of PMS. I take 100mg before bed, and my sleep has greatly improved; I now recall my dreams vividly, indicating deeper sleep. For those with metabolic disorders or sleep issues, I recommend L-Theanine, as it's crucial for sleep recovery. It synergises well with melatonin.
Read More
9
Mental stability
11 people found this helpful
As someone who has battled severe sleep disorders for years, I managed to stop my medication with the help of iHerb's melatonin and theanine. This product has demonstrably aided my sleep and mental stability. The delightful aroma of decaffeinated green tea adds to its appeal. The tranquil effects are noticeable both day and night, sharpening my focus, even when paired with coffee. It's an excellent product, albeit slightly pricey.
Read More
9
Effective for sleep
6 people found this helpful
For years, I suffered from severe sleep disorders and relied on potent sleeping pills. After deciding to stop all medication, I used iHerb's melatonin and this theanine, which proved effective for sleep and stability. The 100mg version, with its green tea leaves and soothing scent, is my favourite. The calming effects manifest not just during sleep but also help improve daytime concentration. Though pricey, it's a worthwhile investment for its benefits.
Read More
10
Calmness after use
4 people found this helpful
Working in retail, I often encounter rudeness, and I discovered that theanine has been a lifesaver. I take it only when necessary and feel a noticeable calmness within 20 minutes, allowing me to forget my troubles. My resentment and anxiety dissipate, resulting in deep, peaceful sleep. I have experienced no gastrointestinal issues. I will certainly order more.
Read More
Frequently Asked Questions
9
Natural antidepressant
4 people found this helpful
I've struggled with anxiety and depressive episodes for 15 years. After taking an SSRI for two years, my doctor advised stopping it, but the symptoms returned worse than before. I tried L-theanine, hoping for a natural solution. To my surprise, it worked wonders, helping me regain my mood. I take two tablets in the morning, one at lunchtime, and another before bed. It relaxes me and improves my mood. It took two weeks to see results, but I highly recommend it for anxiety and depression, alongside B-vitamins and a healthy lifestyle.
7.5
Daily calm achieved
5 people found this helpful
Initially, I didn’t notice effects, but after a few days, I realised this product truly works. I take one capsule half an hour before breakfast, and my day is much calmer now! I used to be very tense at work and home, but now I feel at ease. I’m very pleased with how well L-theanine suits me.
2
No improvements seen
I have been taking these for two weeks, but I haven't noticed any improvements. Unfortunately, I also experienced stomach pain while taking them, so I won’t be ordering them again.
8
Reduced anxiety
26 people found this helpful
It works from stress. L-Theanine with Green Tea is intended to reduce stress and side effects. Together with caffeine, it soothes and invigorates. I noticed a real effect on myself: it gives strength, improves my mood, and fear no longer bothers me as much as before. Once, I took theanine before a driving test, and remarkably, the fear diminished, allowing my mind to be clearer. As a result, I passed! I want to order more, as I find it truly beneficial.
9
Stress reduction
12 people found this helpful
L-Theanine is a unique amino acid found mainly in tea plants and is shown to reduce stress, improve sleep quality, and lessen symptoms of PMS. I take 100mg before bed, and my sleep has greatly improved; I now recall my dreams vividly, indicating deeper sleep. For those with metabolic disorders or sleep issues, I recommend L-Theanine, as it's crucial for sleep recovery. It synergises well with melatonin.
9
Mental stability
11 people found this helpful
As someone who has battled severe sleep disorders for years, I managed to stop my medication with the help of iHerb's melatonin and theanine. This product has demonstrably aided my sleep and mental stability. The delightful aroma of decaffeinated green tea adds to its appeal. The tranquil effects are noticeable both day and night, sharpening my focus, even when paired with coffee. It's an excellent product, albeit slightly pricey.
9
Effective for sleep
6 people found this helpful
For years, I suffered from severe sleep disorders and relied on potent sleeping pills. After deciding to stop all medication, I used iHerb's melatonin and this theanine, which proved effective for sleep and stability. The 100mg version, with its green tea leaves and soothing scent, is my favourite. The calming effects manifest not just during sleep but also help improve daytime concentration. Though pricey, it's a worthwhile investment for its benefits.
9
Stress relief achieved
8 people found this helpful
It's a fantastic way to cope with stress! This "anti-stress" agent, derived from the amino acid L-theanine in green tea leaves, helps me relax and calm down. Japanese research indicates it can normalise stress-induced pressure and enhances concentration and mood. Although I’ve read that 500 mg is optimal, I personally find 100 mg effective, providing me with a surge of strength and endurance while significantly improving my emotional state. I will undoubtedly order this product again!
10
Calmness after use
4 people found this helpful
Working in retail, I often encounter rudeness, and I discovered that theanine has been a lifesaver. I take it only when necessary and feel a noticeable calmness within 20 minutes, allowing me to forget my troubles. My resentment and anxiety dissipate, resulting in deep, peaceful sleep. I have experienced no gastrointestinal issues. I will certainly order more.
7.5
Stability restored
1 people found this helpful
I have struggled with anxiety disorders, but since discovering theanine, I've found stability. I take three pills daily, and it effectively manages my anxiety and panic. Mixing it with coffee also provides a neurotropic effect. The packaging is convenient, and the pill size is appropriate for taking.
9
This study explored how L-theanine can influence the effects of cuprizone-induced multiple sclerosis in mice.
We observed that when L-theanine was administered alongside cuprizone, it improved locomotor functions and reduced damage typically caused by the disorder.
Notably, mice receiving L-theanine showed enhancements in ambulation and grip strength compared to the control group.
While the study indicates potential benefits of L-theanine, further research is necessary to fully understand its effectiveness in human autoimmune conditions.
We observed that when L-theanine was administered alongside cuprizone, it improved locomotor functions and reduced damage typically caused by the disorder.
Notably, mice receiving L-theanine showed enhancements in ambulation and grip strength compared to the control group.
While the study indicates potential benefits of L-theanine, further research is necessary to fully understand its effectiveness in human autoimmune conditions.
References
- Khosravi-Nezhad S, Hassanpour S, Hesaraki S. L-Theanine Improves Locomotor Function in a Model of Multiple Sclerosis Mice. Arch Razi Inst. 2023;78:195. 10.22092/ARI.2022.360066.2544
