Customer Ratings & Reviews

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4.7

Based on 605 ratings

487

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What customers say

(240)

iHerbCustomer

Posted on 2/03/2026

Ukraine

Clarity, concentration, focus and noise cancellation

Verified Purchase

I got acquainted with L-theanine more than six months ago. I liked its effect: it turns off unnecessary noise, but leaves concentration. It is effective for long-term work in stressful situations. Sometimes I use it several times in a row, that is, for several days in a row, sometimes when I feel the need to turn off unnecessary triggers. I have not noticed any side effects, I do not feel either drowsiness or dullness. Clarity, concentration, focus and turning off noise.

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mimimimii

Gold

Posted on 18/07/2026

Japan

426

689

Cost performance

Verified Purchase

I think my sleep quality has improved since I started taking L-theanine and melatonin together. I used to wake up many times at night due to muscle tension and restless legs syndrome, but it's gotten much better since I started taking L-theanine. It's an essential supplement for me. This is my first time trying this brand, but I bought it because it's cost-effective.

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Olena

Posted on 25/04/2026

Ukraine

Verified Purchase

Very satisfied with the quality of this L-theanine - it contains only the necessary ingredient without unnecessary additives. The dose of 200 mg is optimal for a noticeable effect. The size of the capsules is convenient, easy to swallow. The packaging is dense, easy to use. The main advantage is that it reduces anxiety and at the same time maintains energy and clarity of thought

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2155

Gold

Posted on 10/01/2026

Japan

431

360

Perfect for when you can't sleep or when you want to concentrate in the morning.

Verified Purchase

L-theanine is an amino acid specifically designed for those who want to "calm the mind while keeping the mind clear." Its greatest benefit is that it relieves tension and anxiety without causing drowsiness or dullness. It calms excessive sympathetic nervous activity while maintaining concentration and judgment. It also has the effect of suppressing the restlessness caused by caffeine, making it an extremely easy-to-use ingredient that can be used for a wide range of purposes, from work and study to switching between activities before bed.

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Sergiu Anisei

Gold

Posted on 3/03/2026

Moldova

551

658

Verified Purchase

I’ve been using Nature’s Trove L-Theanine 200mg for a while now, and it’s a solid, reliable supplement. It doesn’t knock you out, doesn’t make you feel foggy, and doesn’t cause any weird side effects. Instead, it gives a subtle sense of calm and mental ease, especially during stressful or mentally busy days. It feels supportive rather than forceful, which I appreciate.

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iHerb Customer

Posted on 27/08/2026

Paraguay

Fitcode, L-theanine, 200 mg, 60 vegetable capsules

Verified Purchase

Excellent product, arrived in perfect condition and exactly on the estimated day, delivered right to my door with excellent service. This Fitcode L-Theanine 200mg 60 vegetable capsules is excellent for post-workout recovery. The packaging is also impeccable, and the capsules are very easy to digest because they are plant-based.

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Maria

Gold

Posted on 13/07/2026

Poland

970

4,851

Verified Purchase

L-theanine is a unique amino acid found primarily in green tea. Its main benefit is that it provides deep relaxation without drowsiness. Theanine helps relieve anxiety, improves sleep quality, increases concentration, and increases stress resistance. [

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iHerbCustomer

Silver

Posted on 30/05/2026

South Korea

186

I take one pill before going to bed.

Verified Purchase

I haven't been taking it for very long, so I don't know about the effectiveness yet, but I bought it because everyone else seems to be taking it. The pills aren't small, so I take them with a glass of water.

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HimawariCare

Posted on 2/04/2026

Japan

200mg is a convenient size for continued use.

Verified Purchase

The balance of quality and ingredients is excellent, and I continue to take it daily for managing my health. The 200mg type is easy to swallow in terms of size and shape, making it easy to incorporate into my daily routine. I think it would be suitable for people looking for an amino acid supplement or those who are conscious of maintaining a healthy lifestyle. It's easy to use after training, during relaxation time while dieting, or to switch gears after an energetic day. The taste and smell are not bothersome, so I think it's easy to continue taking even for people who don't like protein supplements.

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Nemuko

Posted on 1/04/2026

Japan

405

It didn't fit the symptoms I was looking for.

Verified Purchase

I suffer from chronic ailments due to autonomic nervous system problems, and I'm prone to mild panic attacks when I'm stressed. I bought this hoping it would calm me down, but it's the kind of calming effect where my head just quiets down. If the dosage isn't right, it makes my head feel foggy, like a less claustrophobic version of the psychotropic drugs I used to take. My cognitive and thinking abilities decreased, and while it did calm me down, it wasn't the right feeling. It's rare for my physical condition to worsen due to my head racing; usually, it's the stress caused by general malaise that makes things worse, so glycine worked better for me for those kinds of panic attacks. I'll probably take this when unpleasant thoughts start to run through my head.

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