Helps me stay asleep
"Been waking up between 3am & 5am. This helps me sleep thru the night."
Suntheanine® 200 mg
The Original L-theanine
The original, most clinically researched L-theanine. Clinically proven to support calm, focus, and restful sleep without drowsiness. Backed by 50+ Suntheanine®-specific studies and 30+ years of trust for quality, consistency, and predictable results. Suntheanine® is produced through a patented enzymatic fermentation process that mirrors how L-theanine forms naturally, delivering a clinically meaningful dose with unmatched purity and fast-acting calm you can feel. If you've tried generic L-theanine, prepare for a real upgrade.
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Why You’ll Love Suntheanine®?
Certifications
What Makes Suntheanine® Different ?
The original L-theanine
Bio-identical, mirrors nature
Made by enzymatic fermentation
50+ clinical studies
FDA GRAS confirmed safety
Consistent, predictable results
Trusted worldwide for 30+ years
How Suntheanine® Works
Suntheanine® L-theanine supports a calm, relaxed alertness by influencing the brain's natural alpha wave activity. This is the same brainwave pattern associated with deep focus and mental clarity.
01
Crosses the blood brain barrier efficiently*
02
Helps promote focus*
03
Improves cognitive performance when combined with caffeine*
04
Quickly feel the benefits after your first dose*
05
Promotes calm and clarity without grogginess*
For Moments
When It Matters Most
When pressure builds, you need to stay clear, composed, and in control.
- Calm without losing clarity
- Focus without overstimulation
- Rest without sedation
What the Experts Say
Shawn Talbott
PhDPsychonutritionistStress affects many areas of your life, from sleep to sports performance to energy levels. Suntheanine® helps you settle into a more positive cycle: sleeping better at night leads to more daytime energy which leads to more quality sleep and continued productive days.
Bryce Wylde
B.Sc. Hons. (BioPsyc), DHMHSFunctional Medicine ExpertSuntheanine® replaces my 2 p.m. cup of coffee, giving me the power of coffee without the jitters. A calm, focused and alert attention is the type of energy we all desire: energy that makes us more efficient, not frazzled and distracted.
Michael R. Lyon
MDPhysician, medical researcher and authorI was in charge of a large double blind study where 200 mg Suntheanine® was consumed twice per day for 6 weeks in 8-12 years boys with ADD. No side effects were reported and I now view Suntheanine® as one of the safest natural products that can be given to a child.Frequently Asked Questions
Most people feel noticeably calmer and report more focus with their very first dose, often within about 30 minutes.*
Yes, you can take Suntheanine® with caffeine to help smooth out jitteriness while at the same time supporting mental clarity.*
Suntheanine® is clinically researched, patented, nature inspired, and produced via a patented pure enzymatic fermentation.*
No. Suntheanine® supports calm and clarity without sedation.*
Suntheanine® has been used safely in numerous clinical trials and is trusted by healthcare practitioners.*
Overall rating: 4.818182 / 5 from 11 reviews.
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Review highlights
Reviews
Just what I was searching for. . . .
"Provided the help I needed for relaxation and a better nights sleep."
I just started Suntheanine L-Theanine
"I just started Suntheanine L-Theanine Tomorrows Nutrition and I must say I had noticed a difference in my over well being more relaxed. I take my time now and I’m not always rushing to finish things that can be done the next day. I’m hoping I can continue taking this long term every night. Not sure about the safety taking it long term, but for now it seems to be working."
Using as a sleep aid
"It’s been over a month since I started taking this to assist in sleeping, to aid in restlessness, calming my brain. I use along with Magnesium and it has been helpful in getting settled, and not waking up with 3 am. The 200mg was not effective so I started 400mg and coupled with Magnesium is the sweet spot for my sleep needs."
"Quality"
Very effective!
"I love the new strength, which I take before bed every evening. I sleep calmly and through the night."
Happy!
"Working great!"
Best sleep ever!
"I've taken other forms of L-theanine in the past, which were 100 mg and did not have noticeable sleep improvement. With Suntheanine and the Journey program, I was able to measure improvements in my sleep quality over a 30-day period and confirmed it works!"
Love the new 200 mg option!
"I've been a fan of the Tomorrow's Nutrition Suntheanine product, but am loving the new double strength 200 mg, especially for improving the quality of sleep."
"Works very well, definitely will be continuing to order!"
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