Delivery was super quick! Theanine capsules come in this really handy small resealable pouch, I've been sleeping a lot better :)
as seen in
Feel calm and composed with our natural 250mg l-theanine capsules. Theanine is a natural nutrient found in green tea which promotes relaxation without sedation [1]. Our fast-acting, non-sedative l theanine supplement delivers the equivalent theanine content of 15-20 cups of green tea in a single dose.
- 1-a-day. Single capsule dose
- Ideal for anybody looking to unwind, relax but maintain mental clarity or anyone facing acute stressors such as public speaking or travelling
- Increases the relative concentrations of your relaxation chemical GABA within 30 minutes of ingestion [2,3]
- 250mg natural L-theanine powder per capsule
Our l-theanine supplement is manufactured in the UK under strict GMP, ISO 9001, and ISO 22000 certified conditions in an FDA-registered facility.
66 studies show l-theanine promotes relaxation
brain feed’s analysis of 66 published trials confirmed that l-theanine supports relaxation. Backed by science, proven by research.
*brain feed does not test or commission studies on animals. This is an analysis of pre-existing studies.
what is l-theanine ?
Responsible for green tea’s calming effects, theanine is a naturally occurring amino acid. It’s found primarily in green tea with small amounts also present in black tea and some food sources [4]. Theanine supplements provide a concentrated theanine dosage free from the additional compounds found in green tea.
Many L-theanine supplements use a synthetic form of theanine known as Suntheanine which is made through a chemical process involving ethylamine and L-glutamine. Our theanine is manufactured using a natural fermentation process involving non-GMO corn.
l-theanine benefits
relaxation
Theanine easily crosses the blood-brain barrier and increases the relative concentrations of your relaxation chemical GABA within 30 minutes of ingestion [2,3]. The effects last around 90 minutes [5].
mental clarity
Human studies show that theanine increases alpha brain waves, which signify a relaxed yet alert state [6]. This type of brain wave activity enhances creativity, improves performance under stress, and reduces anxiety [7].
Compared to conventional calming supplements, l-theanine does not cause drowsiness, slowed reflexes, or impaired concentration [8].
★★★★★
"I really liked this product. This can help you be really focused and calm/relaxed at the
same time which is very useful when you are working on a tough task..."
★★★★★
"Calming and soothing without any side effects... "
★★★★★
"So glad I finally found something that noticeably works and is natural... "
track your progress
Track how theanine works for you over time. Adapted from research methods used in over 20 clinical trials across 15 years, brain feed’s user-friendly self-assessments deliver near-instant results. Monitor your brain health through a simple 3-step process, included with your first theanine order, to track results at baseline, 1 day, and 30 days.
what is GABA ?
GABA is a neurotransmitter that helps balance and calm neural activity. By modulating brain activity, GABA benefits your wellbeing by contributing to a sense of inner peace and promoting feelings of calmness [9]
how to increase GABA naturally ?
Increasing GABA levels in the brain can be achieved by :
- Vigorous exercise – 8-17 minutes of vigorous exercise was shown to increase GABA levels [10].
- Yoga – practising yoga for 60 minutes a day 3 times a week for 12 weeks was shown to increase GABA levels [11].
While GABA supplements are available, they can’t be sold in the UK or Canada. The effectiveness of these supplements are still debated.
Early research suggested that GABA was unable to enter the brain [12,13] theorised due to its polar nature, which blocks it from crossing the blood-brain barrier [13]. Newer studies indicate that while GABA might enter the brain in small amounts [12], it is quickly removed. In mice, the rate at which GABA leaves the brain is 17 times higher than the rate at which it enters [14], which might explain the limited evidence of GABA crossing the blood-brain barrier.
Theanine reliably crosses the blood-brain barrier [15] offering a well-studied, safe and effective relaxation supplement.
purity promise ™
Purity Promise™
Purity has four components:
1. brain feed ensures the high quality of our extracts and isolates through rigorous testing
2. We monitor critical control points during production for quality control
3. We guarantee the amount of active ingredient(s)
4.Preserve the bio-active compounds for the duration of their shelflife.
Click here to read more
NutriProtect ™
NutriProtect™
Nutriprotect™ is our innovative capsule technology with additional UV protection built into the shell. It improves nutrient stability, allowing us to remove a permanent UV barrier used in composite packaging materials. The net result: fully recyclable pouches. Click here to read more.
FAQ's
Is this natural theanine ?
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How to take theanine ?
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Are there any l theanine side effects or contraindications ?
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how much l theanine per day is recommended ?
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how much l theanine per day is recommended ?
What should I notice?
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Does theanine benefit cognition ?
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Can I just drink a lot of green tea to get enough theanine?
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How long does l theanine take to work ?
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Does theanine help sleep ?
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Best time to take l theanine ?
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Customer Reviews
Overall rating: 4.2 / 5 from 135 reviews.
Great product but delivery is not next day. It took a week
Store owner replied: Hi Ivaylo, Thanks for your feedback—great to hear you're enjoying the product! Apologies for the delay in receiving your order. All our UK orders are dispatched via Royal Mail’s next-day service, but occasional delays can occur - Christine, brain feed customer care
Surprisingly fast acting. Customer info booklet with clinical studies was a great reference point. I would like to see this in a bigger pack size
This product has helped me supplement my healthy diet. It speeded up your metabolism. It really works. I recommend it. I usually took it in the evening. I slept soundly.
I really liked this product. This can help you be really focused and calm/relaxed at the same time which is very useful when you are working on a tough task without getting stressed out. I have tried having it together with coffee and it supports having caffeine well but taking off the massive spike that caffeine can sometimes give you. It balances it out by giving you a nice, calm focussed energy. I used this for a couple of weeks and it was great with coffee and without it as well. It feels good to have this in the system. I like that this supplement helps with the increase of GABA concentration. If you have read any of Dr Daniel Amens books, he talks about how GABA has shown to promote relaxation by increasing calming, focused brain waves, while also reducing other brain waves associated with worry. This is why I really like how supportive this supplement can be and I would have to drink 15-20 cups of tea to get the same level of theanine. The capsule size is very small and easy to swallow as well. I like the packaging which is made from craft paper and a compostable plant polymer so you can easily recycle it as well. Overall I have found this supplement to be really beneficial and will continue taking it.
Natural Vegan l Theanine Capsules | 250mg Theanine Powder from Organic Green Tea Extract in Capsules| Aids Relaxation without Sedation | GABA supplement support THE ONLY NATURAL 250MG THEANINE Extract. It's good to see that these supplements are in a small resealable paper and foil lined bag. This I a first for taking these theanine capsule supplement, I've been taking 2 every morning since they arrived and I do think they are helping with relaxing which I was struggling with, I also feel less anxious. These 250mg natural theanine capsules are extracted from Organic Green Tea, helps brain concentration. You get 30 capsules so they will last me 15 days, they work out quite expensive and as much as I'd like to buy again I won't as too pricey, would probably buy if on offer tho. Can highly recommend.
As a person with anxiety and stress issues I decided to test these capsules. The package consists of 30 small (250mg) capsules, easy to swallow, no odour, no particular aftertaste. The capsules are a standard size, with a dark green colour. Dosage is 1-2 a day. I found the packaging very accessible as it has a good press seal. I realised a sedative effect after about 30-40 minutes after taking one capsule. I felt quite relaxed and realised my mood has been better than before the capsules, and I did not overthink that much like I usually do everyday. I felt quite sleepy after around 2 hours of taking the capsule. My body was very calm and relaxed. However, vitamins and supplements show their best effect over time and I believe I have to give it a longer time to examine it’s full effect. I do particularly like that these capsules are vegan and vegetarian friendly. I do think this product is worth the price. I do highly recommend that you consult your doctor before taking this supplement to make sure this is right for you.
Most L-theanine on the market is synthetic apparently. I've been researching it & apparently "Suntheanine" is very pure & made purely from green tea. I was intrigued to find this one doesn't say Suntheanine but it I'd a very pure form of L-Theanine. Most respected health shops sell this brand. Best taken 1-2 hours before bed & on either full stomach or something to eat to coat the stomach; (a banana, biscuit or yoghurt). Overview : A pack of 30 small (250mg) capsules, easy to swallow, no odour. Dosage is 1-2 a day. I like these are vegan & suitable for vegetarians & vegans. I did notice a slight relaxation on taking one tablet. However, please note vitamins & supplements work over time, gradually generally. Also, bear in mind, when buying vitamins, either buy the best quality or none at all. The added chemicals can make matters worse, thus stick to natural & high quality ingredients. ***i'm concerned by the bulking agent , I'm the ingredients, it says: "VEGETABLE CELLULOSE CAPSULES BULKING AGENT". Google doesn't give me an exact ingredient result for this, but this one: "Microcrystalline Cellulose A refined non-digestive plant fibre, commonly used as an emulsifier or bulking agent in the manufacture of pharmaceuticals". If its the same, I have concerns that it might be non-digestible. Generally, I can't tolerate bulking agents, they make me bloated, but not with these. It'd therefore be appreciated if seller made this clearer. Recommended dose: -240 to 400 mg per day in divided doses. Though I only take 1-2 hours before Nedd to help with sleep. Pros: -extracted from green tea from the mountainous region of Hunan Province in South Central China -organic -vegan -all natural L-Theanine has a number of benefits, you can google this. Namely: - natural anti-stress -natural anti-anxiety remedy -natural remedy for psychiatric conditions (eg. Schizophrenia, ADHD etc) -aids a more relaxing sleep (but NOT as a sleeping tablet, IOW it won't work to put you to sleep but will relax you to help with sleep) L-Theanine, for the most part, is a relaxing but not sedating amino acid. it can be attained via a diet high in green tea (only dietary source of L-Theanine). A 2011 study looked at the effects of L-theanine on 98 boys aged 8 to 12. A randomized group was given two 100 mg chewable tablets of L-theanine twice daily. The other group received placebo pills. After six weeks, the group taking L-theanine was found to have had longer, more restful sleep. While the results are promising, more research is needed before it can be proven as safe and effective, especially for children.
I can be a little bit tightly wound sometimes, and from a bit of research I thought I'd give l-theanine a try as a bit of a nootropic supplement. I've got this version and an alternative that's 400mg per capsule to try, I've not been using it long enough to go into great depth about it's effectiveness but I am happy to give feedback on the format of the product itself at this stage. Of the two versions I'm trying this one has much nicer packaging by far and it's a fantastic touch that it is recyclable in the same waste as Tetrapak cartons. The packaging is a foil lined and coated matte paper vouch, with a decent press seal. It's discreetly sized, well detailed, and the capsules themselves are not unpleasant to take. They're a standard size and dark green colour with no particular aftertaste. I believe L-Theanine works best in conjunction with caffeine, and while it would be nice if some caffeine could be added to the capsule, I'm currently trying one in the morning and one once I've finished at the office each with a cup of coffee.
It helps with calming the mind and aniexty.
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I have not received it
Tablets arrived within days, good service. Early days yet to see if they work or not as I have had chronic insomnia for many years and I have only taken them for one week. Hence 3 stars only.
Store owner replied: Thank you for your feedback. Theanine promotes relaxation without sedation and is best for those who are looking to relax but maintain mental clarity. For regulatory reasons, we are unable to dispense medical advice regarding medically diagnosable conditions such as insomnia and would recommend you speak to your GP for further guidance - Christine, brain feed customer care
I take one capsule with food in the evening. I immediately noticed a reduction in anxiety / stress levels and an increase in focus and ability to concentrate.
Ridiculous customer service, no possibility of phoning the company!
Store owner replied: Hi Gillian, Thank you for your feedback. We operate in a highly regulated industry. As such our protocols require a full audit trail.We can answer any product questions you have over email and we aim to respond within 1 business day. Please note, we are unable to dispense medical advice or discuss pharmaceutical interaction. Please email infor@brain-feed for further support. Christine - brain feed customer care
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I have insomnia for many years, after reading the reviews I thought I would give them a try. Unfortunately they did not help with my sleep and when I do finally drop of my deep sleep is only about 1 hour each night.
Store owner replied: Hi Bluenose, Thank you for sharing your experience. Theanine promotes relaxation without sedation - it does not promote the onset of your sleep hormone melatonin. Please speak to your GP if your insomnia symptoms persist. Best, Christine [brain-feed customer services]
It's very good for the money
I’ve been suffering from anxiety and chronic stress at work for a while, and have tried many other supplements. I’m very pleased with this product as its not drowsy, helps to stay calm and keep concentration at work, it also seems to ease muscle pain and tension after gym workouts. I would recommend it to anyone with similar health concerns.
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it works lol
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Calming and soothing without any side effects of the pharmaceutical drugs. It’s a natural product of matcha tea. Recommend.
Amazing! Best thing for anxiety. So glad I finally found something that noticeably works and is natural without side effects! Used to take propranolol to manage anxiety but that was imperfect for many reasons. This not only calms situational anxiety but stress. Magic pill, will be ordering more!
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I tried the Theanine capsules for 30 days to see if it would help manage anxiety and a stressful life period. I have to say that i noticed the effects after about 10 days. I felt calmer, more in control and less stressed. I will be ordering more!
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Alcohol dependence
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May 15, 2026
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L-theanine & anxiety explored in study: keep calm under pressure
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New proof for l-theanine effects in 2024: helping you relax and focus
The relaxation nutrient theanine has been once again confirmed as providing relaxation without sedation. Read more about the effects of theanine on your well-being, explored in 2024.
