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Swanson Vitamins

Suntheanine® L-Theanine, 100 mg, 60 Veggie Capsules

4.8 · 432 reviews
1,926 ₽

Brain and Emotional Health 100 mg Per Capsule Dietary Supplement Vegetarian Suntheanine® Supports Balanced Mental Health and Emotional Wellbeing Maintains a Feeling of Calm While Remaining Alert Science-Backed Quality Since 1969 Get the most out of your life by de-stressing with Suntheanine L-Theanine! This unique amino acid has been extensively researched and shown to promote relaxation without causing drowsiness. Swanson Ultra, featuring patented SunTheanine, offers a safe and effective alternative to help you keep up the pace with a smile on your face!

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Brain and Emotional Health 100 mg Per Capsule Dietary Supplement Vegetarian Suntheanine® Supports Balanced Mental Health and Emotional Wellbeing Maintains a Feeling of Calm While Remaining Alert Science-Backed Quality Since 1969 Get the most out of your life by de-stressing with Suntheanine L-Theanine! This unique amino acid has been extensively researched and shown to promote relaxation without causing drowsiness. Swanson Ultra, featuring patented SunTheanine, offers a safe and effective alternative to help you keep up the pace with a smile on your face!

Customer reviews

5.0
verified purchase
Useful for coping with a stressful job

As experiment I took 200-600mg a day for reducing nervousness but there was no effect. I also did not see any improvement of my sleep. However I noticed that my anger and agitation at work was reduced. If you are working in a stressful environment it might be worth a try

10/16/2025
5.0
verified purchase
Sleep

These pills help me relax so I can get some sleep. I take them in combination with other supplements for sleep, & the combo seems to be helping a lot. They are small capsules, so they’re easy to take. Will always keep these handy for bedtime.

9/20/2023
5.0
verified purchase
Calming without drowsiness

Good quality L-Theanine that helps take the edge off stress without making me sleepy. I notice better focus and a calmer mood, especially when taken in the afternoon or evening. Capsules are easy to swallow and the formula is simple and clean. Solid option for daily use.

12/22/2025
5.0
verified purchase

L-theanine is very helpful for relaxation without making one drowsy. It helps for focus just as much as for sleep. Suntheanine is a more controlled form of l-theanine, which gives more reliability to the supplement

12/7/2025
5.0
verified purchase
If theanin, then THIS!

After the 2nd or 3rd days of getting it WITH coffee! i started feeling sharper mentally. Reduces the "hearbeat" effect of the caffee but sharpenes your focus which give you more performance!

11/30/2025
5.0
verified purchase
The "Short & Honest" Review

I take this when my head feels heavy and tight from stress. It literally "shuts down" the unnecessary thinking. I don't worry about tomorrow or stress about work; I just feel calm. Best taken on an empty stomach for the strongest effect. Highly recommend.

11/21/2025
5.0
verified purchase
Great product

L-Theanine is a great product for promoting calmness and focus without drowsiness. The quality of the ingredients is outstanding, and the dosage feels just right for daily stress support. The capsule size is easy to take, and it delivers consistent, noticeable results for relaxation and mental clarity.

11/11/2025
5.0
verified purchase

This product helps me in the evening to reduce anxiety and stress. Make sure that L-theanine products are made from Suntheanine, which is more pure and used in this product. L-theanine is extracted from Green Tea. If it's not pure, some other contaminants especially caffeine could be included. Contaminated caffeine can make you feel even worse.

10/15/2025
5.0
verified purchase

this is a fantastic supplement! i take this as needed when i anticipate having a stressful day, i’ve seen a noticeable improvement in my mood and behavior since taking this to manage stress and anxiety. the quality is undeniable. i take it as needed & embrace the benefits this supplement provides!

10/12/2025
5.0
verified purchase
Ease stress and supports clear focus

Suntheanine L-Theanine is excellent for promoting calm without making you feel drowsy. It helps ease stress and supports clear focus, making it easier to stay productive and relaxed at the same time. Many notice better sleep quality when taking it in the evening, as it gently relaxes the mind. It’s a simple way to bring balance to busy or stressful days.

9/30/2025