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To support a healthy mood or to help reduce symptoms of anxiety, take 1-2 capsules of L-Theanine as required. L-Theanine can also be taken 30 minutes before sleep to help improve relaxation and to reduce the amount of time it takes to fall asleep.
To support productivity, 1 – 2 capsules of L-Theanine can be taken 20 – 30 minutes before any task that requires increased levels of focus and concentration.
While L-Theanine can be taken with food, most people find that its effects are best felt when taken on an empty stomach.
| Amount Per Capsule | Amount | %NRV |
|---|---|---|
| L-Theanine | 200mg | * |
Nutrient Reference Value not established*
Suitable for vegans. Contains no GMOs, common allergens, artificial colours, preservatives or flavours.
Date · Batch # · Results
Purity results include Heavy Metals
Testing is carried out by Certified Labs (formerly Micro Quality Labs).
To maintain the potency and quality of your L-Theanine, store it in a cool (20°C-25°C), dry place away from light.
Manufacturing: All products are made to GMP standards and have been quality-managed in accordance with the UK standard ISO 9001:2015.
Third-party tested: To ensure the highest purity and maximum effectiveness, each new batch of products undergoes third-party testing by ISO 17025 accreditated Micro Quality Labs. You can view all testing certificates at www.vitality-pro.com/batch-testing.
“Do not exceed the recommended daily dose. Food supplements should not replace a varied and balanced diet and a healthy lifestyle. If you are pregnant, breastfeeding, under 18 or taking any medication, consult a doctor before use. Stop use if adverse reactions occur.
Interactions: L-Theanine may have additive effects when combined with central nervous system (CNS) depressants such as benzodiazepines, barbiturates, and sleep medications, potentially increasing drowsiness or enhancing sedative effects. When taken with antihypertensive medications, L-Theanine may further lower blood pressure, increasing the risk of hypotension in sensitive individuals. Additionally, L-theanine can interact with stimulants, including caffeine and certain ADHD medications, by modulating or blunting their stimulating effects and potentially altering their efficacy or side effect profile. Although L-theanine is generally well-tolerated, these interactions may be more pronounced in individuals sensitive to such medications or when used in higher doses.
For further information regarding any other potential drug and supplement interactions with L-Theanine, please see the ingredient profile on Drug Bank.*
Allergy: This product does not contain any common allergens; however, it should not be used by anyone with a history of hypersensitivity to its ingredients or those taking medications that may interact with it.
Pregnancy: If pregnant, consult your health professional before using this product.
*Drug Bank is an independent website that lists potential interactions between the ingredients in L-Theanine and other medications and supplements. It may not, however, list all known possible interactions. If you are taking any medications or supplements that may interact negatively with L-Theanine, please speak with your doctor before using this product.”
L-Theanine is a molecule found in green tea known for promoting calm focus without drowsiness. It supports neurochemical production and enhances alpha brain waves, helping to promote a sense of calm while increasing focus and attention.
To support a healthy mood or to help reduce symptoms of anxiety, take 1-2 capsules of L-Theanine as required. L-Theanine can also be taken 30 minutes before sleep to help improve relaxation and to reduce the amount of time it takes to fall asleep.
To support productivity, 1 – 2 capsules of L-Theanine can be taken 20 – 30 minutes before any task that requires increased levels of focus and concentration.
While L-Theanine can be taken with food, most people find that its effects are best felt when taken on an empty stomach.
| Amount Per Capsule | Amount | %NRV |
|---|---|---|
| L-Theanine | 200mg | * |
Nutrient Reference Value not established*
Suitable for vegans. Contains no GMOs, common allergens, artificial colours, preservatives or flavours.
Date · Batch # · Results
Purity results include Heavy Metals
Testing is carried out by Certified Labs (formerly Micro Quality Labs).
To maintain the potency and quality of your L-Theanine, store it in a cool (20°C-25°C), dry place away from light.
Manufacturing: All products are made to GMP standards and have been quality-managed in accordance with the UK standard ISO 9001:2015.
Third-party tested: To ensure the highest purity and maximum effectiveness, each new batch of products undergoes third-party testing by ISO 17025 accreditated Micro Quality Labs. You can view all testing certificates at www.vitality-pro.com/batch-testing.
“Do not exceed the recommended daily dose. Food supplements should not replace a varied and balanced diet and a healthy lifestyle. If you are pregnant, breastfeeding, under 18 or taking any medication, consult a doctor before use. Stop use if adverse reactions occur.
Interactions: L-Theanine may have additive effects when combined with central nervous system (CNS) depressants such as benzodiazepines, barbiturates, and sleep medications, potentially increasing drowsiness or enhancing sedative effects. When taken with antihypertensive medications, L-Theanine may further lower blood pressure, increasing the risk of hypotension in sensitive individuals. Additionally, L-theanine can interact with stimulants, including caffeine and certain ADHD medications, by modulating or blunting their stimulating effects and potentially altering their efficacy or side effect profile. Although L-theanine is generally well-tolerated, these interactions may be more pronounced in individuals sensitive to such medications or when used in higher doses.
For further information regarding any other potential drug and supplement interactions with L-Theanine, please see the ingredient profile on Drug Bank.*
Allergy: This product does not contain any common allergens; however, it should not be used by anyone with a history of hypersensitivity to its ingredients or those taking medications that may interact with it.
Pregnancy: If pregnant, consult your health professional before using this product.
*Drug Bank is an independent website that lists potential interactions between the ingredients in L-Theanine and other medications and supplements. It may not, however, list all known possible interactions. If you are taking any medications or supplements that may interact negatively with L-Theanine, please speak with your doctor before using this product.”
Orders placed are shipped within 24 hours (Monday to Friday) from the UK.
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Customer Care | +44 (0) 1202 082 280 | support@vitality-pro.com
While individual results may vary due to personal health conditions, genetics, and lifestyle choices, we guarantee that the supplements you receive are made with ingredients of the highest purity, similar to those used in scientific studies, to ensure maximum results.
l-theanine adjunct to sertraline for major depressive disorder – Randomised Controlled Trial
Dosage: Sertraline 100 mg per day plus L-theanine 200 mg per day, for 6 weeks
Outcome: Change in depression scores (HDRS)
Summary: Adding L-theanine to sertraline improved mood more than sertraline alone and was well tolerated.
The effects of L-theanine supplementation on the outcomes of patients with mental disorders – Systematic Review
Dosage: 200–450 mg/day L-theanine, most commonly 400 mg/day, usually given in divided doses; used as an add-on to standard treatments.
Outcome: Changes in symptoms of mood and mental health disorders (anxiety, depression, ADHD, schizophrenia, OCD, sleep disorders).
Summary: L-theanine supplements, taken at 200–450 mg per day, may help reduce anxiety and improve mood in people with some mental health conditions, especially when used alongside standard medication. More research is needed, but L-theanine appears safe and may help support a healthy mood.
Effects of chronic l-theanine administration in patients with major depressive disorder– Open-label Clinical Trial
Dosage: 250 mg l-theanine per day for 8 weeks
Outcome: Changes in depression, anxiety, sleep quality, and cognitive function
Summary: Taking 250 mg l-theanine daily for 8 weeks improved mood, reduced anxiety and sleep problems, and boosted thinking skills in people with depression. The supplement was well tolerated.
The Effects of L-Theanine Supplementation on Quality of Sleep – Systematic Review
Dosage: 50–655 mg L-theanine per day (1 day to 8 weeks); doses above 655 mg may not help and could worsen sleep
Outcome: Changes in sleep quality and related sleep measures
Summary: L-theanine at 50–655 mg daily can help improve sleep quality, reduce time to fall asleep, and support better rest, but taking more than 655 mg might be less helpful or even harmful.
L-theanine: From tea leaf to trending supplement – does the science match the hype for brain health and relaxation? – Review
Dosage: Typically 50–250 mg per day in supplements; 5.8–32 mg per 200 ml of brewed tea; some sleep studies in children used 200 mg twice daily.
Outcome: Effects on sleep quality, relaxation, and brain wave patterns.
Summary: L-theanine may help relaxation and sleep quality, mainly by reducing stress and increasing alpha brain waves, but there is not enough strong evidence from human trials to confirm clear sleep benefits.
L-Theanine is a naturally occurring amino acid found almost exclusively in green tea (Camellia sinensis). Structurally similar to glutamate, a neurotransmitter in the brain, it has been traditionally consumed to promote relaxation and a sense of calm focus, all without causing drowsiness. Now supported by modern research L-Theanine is now widely utilised for its calming and nootropic effects.
L-Theanine crosses the blood-brain barrier, where it is able to influence specific neurochemicals and brain wave patterns. It is known to increase levels of gamma aminobutyric acid (GABA), a calming neurotransmitter, as well as serotonin and dopamine, molecules involved in mood, focus and emotional balance. By supporting GABAergic signalling, L-Theanine is shown to promote a sense of calm and relaxation, making it useful for those looking to stress and anxious feelings.
One of L-Theanine’s unique properties is its effect on brain waves. Research using EEG technology shows that L-Theanine increases alpha wave activity, which is associated with a state of “relaxed alertness”, a calm but attentive mental state that allows for increased focus and productivity. This effect on brain waves as well as L-Theanine’s ability to modulate key neurotransmitters also make it a popular nootropic with many users reporting improved attention, working memory and mental clarity.
L-Theanine is also known for its synergistic interaction with caffeine. When taken with caffeine, L-Theanine smooths out caffeine’s stimulating effects, reducing jitteriness and supporting sustained attention, reaction time and cognitive performance.
As modern life increasingly exposes us to chronic stress, distractions and overstimulation, the ability to maintain mental balance and composure becomes ever more crucial. Unlike other calming agents, L-Theanine promotes relaxation and mental clarity without sedation or impaired function. Its structure allows it to modulate the brain’s neurochemical systems and promote alpha brain wave activity, fostering a calm, focused state even during periods of heightened mental demand.
Chronic stress doesn’t just affect mood, it has far-reaching consequences for the body, especially as we age. Prolonged stress can drive up activity in the immune system, triggering low grade inflammation that has been linked to the development of age related diseases and accelerated cellular ageing. By supporting relaxation and healthy stress responses, L-Theanine may help to buffer the negative impact of chronic stress on immune function and inflammation. This calming effect may help preserve cognitive function, support cardiovascular health and reduce the risk of stress-related inflammatory conditions.
Consider the following statements. If you find one or more relatable, L-Theanine might be the support you’ve been searching for:
We are committed to the following quality controls to ensure consistency, reliability, and transparency in every product. Our goal is to raise industry standards and give you clear reasons to trust what you’re taking.
All products are made to cGMP (current Good Manufacturing Practice) standards, the global benchmark for supplement quality. GMP standards ensure strict control over how our supplements are produced, covering everything from cleanliness to documentation and quality control. Every step is monitored to guarantee consistency and safety in every batch, so you receive the same high-quality product every time.
Created by the US FDA, GMP regulations legally require manufacturers to ensure product safety, purity, and effectiveness. GMP minimises contamination, mix-ups, and errors, protecting consumers from ineffective or unsafe products.
GMP Guidelines Overview:
At the foundation of what we offer is certainty of product quality through consistent third-party testing, specifically for purity.
In an industry where many supplement providers cannot be fully certain of their product quality, third-party testing is essential to ensure purity and safety. This process removes uncertainty, so you can be confident that you’re taking supplements that are both safe and effective.
Every active ingredient in every batch of vitalityPRO products is independently tested by accredited laboratories to ensure unbiased analysis of purity.
Additional third-party testing screens for contaminants such as heavy metals, pesticides, and microbes, ensuring that each product is safe for consumption. Although certificates are provided by the manufacturer, this independent validation goes beyond standard testing, adding an extra layer of quality control.
Independent third-party testing ensures that you receive reliable, high-quality products every time.
ISO 9001:2015 standards are an internationally recognised framework for effective quality management. This accreditation means we follow a structured system of continuous improvement, always refining our processes to enhance product consistency and customer satisfaction. ISO accreditation ensures that every aspect of our operations—from production to customer service—is optimised. This means better oversight, reduced risk of errors, and a clear focus on delivering consistent results.
ISO 9001:2015 accreditation highlights a commitment to quality, customer satisfaction, and continuous improvement.
We believe you should have full clarity about what you’re putting in your body and the steps we take to ensure the quality of our supplements. That’s why we are transparent and open about every part of our process.
Transparency means we share all the details that matter—how our products are made, tested, and verified. From publishing third-party test results to offering clear ingredient labels, we provide you with the information you need to make informed choices about your supplements. Nothing is hidden, and every product comes with full accountability.
L-Theanine promotes relaxation without sedation, helping you stay calm and focused at the same time. It works by supporting neurotransmitters like GABA, serotonin, and dopamine, which regulate mood and mental clarity.
L-Theanine increases alpha brain wave activity, which is linked to a calm yet alert state. This makes it popular for studying, work, and creative tasks where focus and composure are important.
When taken with caffeine, L-Theanine helps smooth out overstimulation, reducing jitters and supporting sustained attention. Many people find this combination boosts productivity without the crash.
Unlike most calming supplements, L-Theanine doesn’t cause drowsiness. Instead it works to promote relaxation while keeping your mind alert and engaged.
L-Theanine is generally well-tolerated at recommended doses. It can be taken daily for ongoing stress and focus support.
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