' 
Supplement Facts
Serving Size: 1 Veggie Capsule
Serving Per Container: 90
Amount Per Serving
%DV
L-Theanine (Suntheanine®)
150 mg
†
The product is found useful for the following medical conditions
Heartburn details
SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 1 Review
8.6
9.5
No heartburn
Most Useful Review
This product really aids in soothing my mind and improving my mood on irritable days! It's gentle on the stomach and does not cause heartburn. I utilise these to help manage pesky PMS symptoms, and my household appreciates their effectiveness!
Migraine details
SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 1 Review
8.6
9.5
Eliminates migraine triggers
Most Useful Review
Theanine, msg, and migraines. Theanine completely prevents migraines from msg in food for me. The latest Alzheimer's drug also blocks glutamate, indicating its importance. If you cannot avoid food additives, theanine has been a lifesaver for me.
Anxiety details
SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 58 Reviews
8.5
9.5
Effective for anxiety
Most Useful Review
Surprisingly helpful. I have tried multiple L-Theanine brands, but Doctor's Best is the only one that works for me. Five years ago, I was advised to use L-Theanine for anxiety, but other brands did nothing for me. This year, I purchased Doctor's Best and finished the entire bottle, as it significantly improved my anxiety. I have panic disorder and recently managed a road trip by using this supplement instead of my prescribed medication, which often makes me groggy. I recommend giving it a try if you experience anxiety.
Diabetes details
SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 1 Review
8.5
8.8
Lowers blood sugar
Most Useful Review
I find this product very useful. I purchased my first bottle in late July, starting with 150mg at bedtime, and it has effectively lowered my morning fasting blood sugar! I noticed this while testing frequently. Perhaps this is due to claims online that theanine can reduce cortisol, a factor in some "dawn phenomenon" cases related to insulin resistance and type II diabetes. While I cannot confirm this, my fasting glucose readings have decreased by 30 points or more! During a particularly stressful time in my life, I took a higher dose of 300mg, which helped me sleep soundly and alleviated my anxiety. Overall, I'm very pleased, though individual responses may vary.
Flu details
SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 1 Review
8.5
8.8
Flu prevention
Most Useful Review
Great price on L-Theanine! Initially recommended for my son during a stressful period, it significantly calmed my other son when he felt anxious. We added it to our supplement list during the flu season. I managed a sinus infection without antibiotics, thanks to L-Theanine and my other supplements. I wholeheartedly recommend it!
Insomnia details
SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 26 Reviews
8.3
9.5
Great for insomnia relief
Most Useful Review
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.
Headache details
SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 1 Review
8
2.5
RLS pain relief
Most Useful Review
I initially took 150 mg of Suntheanine during the day, but it made me dizzy and drowsy, so I switched to night-time use. While it helped with RLS pain, after two weeks, I experienced severe irritability and a raging frontal headache. I stopped using it, and my adverse effects improved within two days. I aim to use it only for severe RLS episodes going forward.
Nausea details
SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Moderately Good
Based on 1 Review
7.7
0
Nausea in kids noted
Most Useful Review
This product caused nausea in my children and did not work as effectively as other brands we've tried. This led me to question its quality, but due to the no-return policy, my only recourse was to share this experience through a review.
