L-Theanine is a non-essential amino acid in the practical form of capsules. This substance is found in nature mainly in the leaves of green tea. In supplement form, people take it alone or combine it with caffeine, for example in coffee or a supplement. Thanks to the plant-based formula, the capsules are also suitable for vegans.
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L-Theanine - GymBeam
4.7Average from 206 reviews
(167 reviews)
(24 reviews)
(11 reviews)
(2 reviews)
(2 reviews)
Most Beneficial Positive Review of Product
István
Verified purchase
I have tried several different remedies for anxiety and panic, but almost all of them seemed to affect me as if I had over-caffeinated myself. Unfortunately, even coffee has been increasingly hard on
Most Beneficial Negative Review of Product
Jakub
Verified purchase
I had previously taken theanine from NOW FOODS, and it worked very well for sleep. I had very vivid dreams, and I felt that my sleep was good... unfortunately, this one from GB doesn’t have any
English reviews (0)
Verified purchases (180)
Positive (187)
Negative (3)
Reviews in other countries (206)
Olda
Verified purchase4/25/2026
Excellent product, I recommend itWas this review helpful to you?Szabina
Verified purchase4/24/2026
It really helps me sleep.Was this review helpful to you?Lele
Verified purchase4/24/2026
I was advised to take glycine together with magnesium bisglycinate and L-theanine to sleep better. The product seems good to me, but at the moment I don’t notice any effect on my sleep.Was this review helpful to you?Tudor
Verified purchase4/23/2026
the source of energy when you’re tired helps you too when it comes to getting better sleepWas this review helpful to you?k
Verified purchase4/22/2026
I started taking it because of my alvasminosis disease symptoms, and it worked for me well. (Please don’t judge me if it’s only placebo.)Was this review helpful to you?rmd
Verified purchase4/21/2026
enhances focus for training, along with other activitiesWas this review helpful to you?MZD
Verified purchase4/21/2026
The product meets the stated requirements.Was this review helpful to you?Darian
Verified purchase4/21/2026
And this is goodWas this review helpful to you?Skip
Verified purchase4/20/2026
It’s simply fine—it does its job.Was this review helpful to you?jetti
Verified purchase4/20/2026
Take at night; pWas this review helpful to you?
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All reviews
L-Theanine - GymBeam
4.7Average from 206 reviews
(167 reviews)
(24 reviews)
(11 reviews)
(2 reviews)
(2 reviews)
Most Beneficial Positive Review of Product
István
Verified purchase
I have tried several different remedies for anxiety and panic, but almost all of them seemed to affect me as if I had over-caffeinated myself. Unfortunately, even coffee has been increasingly hard on
Most Beneficial Negative Review of Product
Jakub
Verified purchase
I had previously taken theanine from NOW FOODS, and it worked very well for sleep. I had very vivid dreams, and I felt that my sleep was good... unfortunately, this one from GB doesn’t have any
English reviews (0)
Verified purchases (180)
Positive (187)
Negative (3)
Reviews in other countries (206)
Olda
Verified purchase4/25/2026
Excellent product, I recommend itWas this review helpful to you?Szabina
Verified purchase4/24/2026
It really helps me sleep.Was this review helpful to you?Lele
Verified purchase4/24/2026
I was advised to take glycine together with magnesium bisglycinate and L-theanine to sleep better. The product seems good to me, but at the moment I don’t notice any effect on my sleep.Was this review helpful to you?Tudor
Verified purchase4/23/2026
the source of energy when you’re tired helps you too when it comes to getting better sleepWas this review helpful to you?k
Verified purchase4/22/2026
I started taking it because of my alvasminosis disease symptoms, and it worked for me well. (Please don’t judge me if it’s only placebo.)Was this review helpful to you?rmd
Verified purchase4/21/2026
enhances focus for training, along with other activitiesWas this review helpful to you?MZD
Verified purchase4/21/2026
The product meets the stated requirements.Was this review helpful to you?Darian
Verified purchase4/21/2026
And this is goodWas this review helpful to you?Skip
Verified purchase4/20/2026
It’s simply fine—it does its job.Was this review helpful to you?jetti
Verified purchase4/20/2026
Take at night; pWas this review helpful to you?
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