as seen in
250 mg 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 capsules deliver the equivalent theanine content of 15-20 cups of green tea in a single dose. This makes them ideal for:
- Anybody looking to unwind
- Anybody looking to relax but maintain performance and clarity
- Acute stressors such as public speaking or travelling
Our l-theanine supplement is manufactured in the UK under strict GMP, ISO 9001, and ISO 22000 certified conditions in an FDA-registered facility.
track your progress
brain feed has developed science-based self-assessments to help you track how Theanine works for you over time.
Adapted from research methods used across more than 20 clinical trials over 15 years, it was developed to be user-friendly and deliver almost instant results, helping you monitor your brain health through a 3-simple step process.
Your first theanine order includes this 3-step assessment to monitor results at baseline, 1-day, and 30-days.
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 [2]. 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 [3,4]. 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].
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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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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Apr 10, 2025
L-theanine & anxiety explored in study: keep calm under pressure
Dec 12, 2024
New proof for l-theanine effects in 2024: helping you relax and focus
Jun 17, 2024
Huberman sleep cocktail review: why you can skip l-theanine
