Last update
5/20/2026
Reviewed By
Overview
SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 5 Reviews
8.4
Supplement Facts
Serving Size: 1 Veggie Capsule
Serving Per Container: 90
Amount Per Serving
%DV
L-Theanine (Suntheanine®)
150 mg
†
Most Useful Reviews
9
Sleep optimisation
35 people found this helpful
This drug has optimised my sleep significantly. Previously, I experienced severe sleep issues due to stress and long work hours, with deep sleep lasting no more than 45 minutes. Using sleep tracking and amino acids, I improved my sleep, but it wasn't until I added L-theanine from this manufacturer that I achieved an excellent effect. My deep sleep duration increased, allowing for maximum bodily restoration. As a doctor, I consider this supplement the best and recommend it to my patients with weight concerns and metabolic diseases. The results are already evident.
Read More
6
Mild calming effect
4 people found this helpful
I've been using 1 capsule (150mg) every now and then. The effect is pleasantly mild yet noticeable; it helps calm my restless mind, improving my concentration. I never feel numb or fatigued; rather, my senses seem heightened. Before bedtime, I sleep well after taking it. I’ve also noticed a slight easing of muscle tension, though I'm unsure if it's solely due to this product. In any case, it works for me—though it's not extraordinary.
Read More
7.5
Morning enhancement
1 people found this helpful
After learning about L-Theanine, I decided to try this product in the morning before eating. It surprisingly produces a notable effect even at the relatively low dose in these capsules. It softens my increasingly anxious cognition and allows me to manage my morning effectively, reducing the jitters from that first strong cup of coffee.
Read More
User Reviews
USERS' SCORE
Good
Based on 5 Reviews
8.4
- All Reviews
- Positive Reviews
- Negative Reviews
9
Sleep optimisation
35 people found this helpful
This drug has optimised my sleep significantly. Previously, I experienced severe sleep issues due to stress and long work hours, with deep sleep lasting no more than 45 minutes. Using sleep tracking and amino acids, I improved my sleep, but it wasn't until I added L-theanine from this manufacturer that I achieved an excellent effect. My deep sleep duration increased, allowing for maximum bodily restoration. As a doctor, I consider this supplement the best and recommend it to my patients with weight concerns and metabolic diseases. The results are already evident.
Read More
6
Mild calming effect
4 people found this helpful
I've been using 1 capsule (150mg) every now and then. The effect is pleasantly mild yet noticeable; it helps calm my restless mind, improving my concentration. I never feel numb or fatigued; rather, my senses seem heightened. Before bedtime, I sleep well after taking it. I’ve also noticed a slight easing of muscle tension, though I'm unsure if it's solely due to this product. In any case, it works for me—though it's not extraordinary.
Read More
7.5
Morning enhancement
1 people found this helpful
After learning about L-Theanine, I decided to try this product in the morning before eating. It surprisingly produces a notable effect even at the relatively low dose in these capsules. It softens my increasingly anxious cognition and allows me to manage my morning effectively, reducing the jitters from that first strong cup of coffee.
Read More
7.5
Insoluble calmness
I suffered from insomnia as my heart raced due to depression, but this supplement alleviated my sleeplessness by calming my anxious mind.
Read More
6
Not relaxing enough
I tried Doctor’s Best L-Theanine to feel more relaxed and calm, but it didn't quite provide the relief I was seeking. I took it regularly, yet the effects didn't meet my expectations. Nevertheless, I acknowledge it's a well-made supplement. The capsules are easy to take, with a solid dosage for those seeking other benefits such as focus and balance. However, it did not induce the deep relaxation I personally had hoped for. Ultimately, it feels like a quality product and might suit those seeking a subtler effect better.
Read More
Frequently Asked Questions
9
Sleep optimisation
35 people found this helpful
This drug has optimised my sleep significantly. Previously, I experienced severe sleep issues due to stress and long work hours, with deep sleep lasting no more than 45 minutes. Using sleep tracking and amino acids, I improved my sleep, but it wasn't until I added L-theanine from this manufacturer that I achieved an excellent effect. My deep sleep duration increased, allowing for maximum bodily restoration. As a doctor, I consider this supplement the best and recommend it to my patients with weight concerns and metabolic diseases. The results are already evident.
6
Mild calming effect
4 people found this helpful
I've been using 1 capsule (150mg) every now and then. The effect is pleasantly mild yet noticeable; it helps calm my restless mind, improving my concentration. I never feel numb or fatigued; rather, my senses seem heightened. Before bedtime, I sleep well after taking it. I’ve also noticed a slight easing of muscle tension, though I'm unsure if it's solely due to this product. In any case, it works for me—though it's not extraordinary.
6
Not relaxing enough
I tried Doctor’s Best L-Theanine to feel more relaxed and calm, but it didn't quite provide the relief I was seeking. I took it regularly, yet the effects didn't meet my expectations. Nevertheless, I acknowledge it's a well-made supplement. The capsules are easy to take, with a solid dosage for those seeking other benefits such as focus and balance. However, it did not induce the deep relaxation I personally had hoped for. Ultimately, it feels like a quality product and might suit those seeking a subtler effect better.
