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Natural Factors

Stress-Relax®, Suntheanine® L-Theanine, 60 Vegetarian Capsules (125 mg per Capsule)

4.7 · 1138 reviews
2,065 ₽

Dietary Supplement Mental Calmness & Relaxation Suitable For Vegetarian/Vegan Purity & Potency Guaranteed Suntheanine contains pure L-Theanine, a unique amino acid found in green tea that is emerging as the premier natural product that supports mental calmness and relaxation. Suntheanine is produced via a proprietary enzymatic process guaranteeing essentially pure L-Theanine for maximum effectiveness. Natural Factors amino acids are the highest quality pharmaceutical grade products available. Isura™: Non-GMO: Documentation ✔ Mass Spec: Lab Tested ✔

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Dietary Supplement Mental Calmness & Relaxation Suitable For Vegetarian/Vegan Purity & Potency Guaranteed Suntheanine contains pure L-Theanine, a unique amino acid found in green tea that is emerging as the premier natural product that supports mental calmness and relaxation. Suntheanine is produced via a proprietary enzymatic process guaranteeing essentially pure L-Theanine for maximum effectiveness. Natural Factors amino acids are the highest quality pharmaceutical grade products available. Isura™: Non-GMO: Documentation ✔ Mass Spec: Lab Tested ✔

Customer reviews

5.0
verified purchase
I feel get comfortable and relax!

I don't know the result yet, so I take this product in the morning and 2 hours before going to bed. However, when I think about the days when I don't use it, I feel that I can fall asleep more gently when I use it. Since it acts slowly, there are no side effects or gastrointestinal burden.

6/28/2021
4.0
verified purchase
bought for adhd

send to help with energy and focus. has no taste. great quality and small enough it's easy to swallow. I like how it makes me feel more calm

5/16/2026
5.0
verified purchase

I started taking L-Theanine to help take the edge off my afternoon anxiety without feeling sleepy. It provides a wonderful sense of calm focus that helps me power through my work without any jitters. I take one capsule around 2 PM, and it perfectly smooths out that stressful part of my day. It's become an essential tool for managing my stress in a natural and effective way.

10/21/2025
5.0
verified purchase

I started taking these on particularly stressful workdays, and the difference is noticeable. It doesn't make me drowsy at all, but instead takes the sharp edge off my anxiety and helps me focus. I find myself feeling calmly alert, without the jitters that coffee sometimes causes. It's become my go-to for navigating tight deadlines with a much clearer head.

10/13/2025
5.0
verified purchase
Love this product!!

When I wake up a little stressed already I take it with my coffee. In the evenings I will take it when I’m going to sleep. Easy to swallow small capsules.

7/29/2025
4.0
verified purchase

Best quality ingredients used. Perfect size and dosage.Lots of benefit and leaves no after taste. I really like this Product , and would love to use it in the future as well. I like how it makes me feel, I really love the brand and its value.

6/20/2025
5.0
verified purchase
Help me relax

This product calms me down, help me relax before i taper on my sleeping pill

6/7/2025
5.0
verified purchase
Great for relaxation and calm focus

I am a big fan of sun theanine and tried many brands; this one seems quite good quality and provides magnified benefits compared to regular l theanine. These are increased relaxation, mental energy, and focus, which also are magnified by combining this with a good magnesium supplement. Good ingredients and size of this particular product

10/19/2024
5.0
verified purchase
Relaxing

Suntheanine is an unbeliavebly helpful aid in falling asleep. I often feel active at bedtime, all kinds of thoughts are keeping me from relaxing. Then I take a Suntheanine and after 15-20 minutes i'm fast asleep. Highly recommended for its calming properties.

10/5/2023
5.0
verified purchase
Great

The quality of this product is really good, nice ingredients. The packaging is useful and I did get benefits from it, the taste is ok. Overall I am really happy with my purchase because it’s great for stress and general mood improvement I really like this product and it’s a good size.

3/16/2026