10 Best L Theanine Caffeine in The UK

Last updated on 06/09/2025

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Old Recipe | 80mg Caffeine & 160mg L-Theanine Focus Enhancing Energy Chews – Neuroscience Backed Nootropic Stack, Mental Acuity & Cognitive Support | Mint Matcha Flavor Brain Bullet, 1 Bag

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Why We Love It

Instant focus for enhanced productivity.
No crash for sustained energy.
Low-calorie formula for guilt-free snacking.

Main Highlights

INSTANT FOCUS & MENTAL CLARITY FOR UP TO 8 HOURS: Backed by neuroscience, Mint Matcha Brain Bullet Chews deliver instant focus and mental clarity for up to 8 hours. Each caffeine chew combines 80mg of caffeine with 160mg of L-Theanine, a proven nootropic stack that sharpens cognitive agility, enhances mental acuity, and boosts energy without jitters or crashes. Ideal for office workers, students, shift workers, and high performers, this smart brain-boosting formula provides essential cognitive support, helping you stay productive and perform at your peak. Whether tackling major projects or long shifts, Brain Bullet helps you stay alert and in the zone—all in one convenient chew.
BOOST PRODUCTIVITY & BEAT BRAIN FOG: Give procrastination the bullet with Mint Matcha's powerful formula, designed with the latest insights from neuroscience to fight brain fog and restore your focus. By enhancing cognitive agility and mental clarity, Brain Bullet Chews help you achieve peak productivity and maintain steady energy throughout the day. The precise combination of caffeine and L-Theanine promotes calm, laser-sharp concentration, making it the perfect companion for studying, big projects, or long shifts. No more distractions, no more doomscrolling—just clear, focused performance within 5 minutes.
NO CRASH, NO JITTERS: Unlike other caffeine products overloaded with sugar and artificial additives, Mint Matcha Brain Bullet Chews offer a balanced and scientifically tested blend of caffeine and L-Theanine for sustained energy and mental clarity. Designed for smart productivity, these chews keep you focused and energized without the crashes or jitters common in sugary energy drinks or high-caffeine snacks. Whether you’re working on critical tasks or simply need a midday boost, Brain Bullet ensures steady cognitive function and optimal alertness without any downsides.
IMPROVE MEMORY & COGNITIVE FUNCTION: Brain Bullet Chews go beyond improving focus—they also enhance memory retention and overall cognitive function. Developed using cutting-edge neuroscience, this nootropic blend boosts mental acuity, sharpens alertness, and supports brain health. Perfect for preparing for exams, tackling important tasks, or enhancing long-term memory, Brain Bullet ensures your mind stays sharp and ready for any challenge. With each caffeine chew, you’re not just increasing your energy—you’re unlocking your full mental potential.
LOW CALORIES & LOW SUGAR: Mint Matcha Brain Bullet Chews deliver a smart, guilt-free alternative to sugary energy drinks and coffee. With only 26 calories per chew and minimal sugar, they’re perfect for maintaining steady energy without spiking your blood sugar or adding extra calories to your day. Individually wrapped and portable, these delicious Mint Matcha treats are easy on your stomach and fit seamlessly into your busy schedule. A pack of 4 chews fits in your pocket, offering quick, near-instant focus and mental clarity whenever you need it—without interruptions or frequent bathroom breaks.

160mg L-Theanine + 80mg Caffeine Chews – Mint Matcha Flavour, Increases Productivity, Mental Clarity, Alertness | 1 Bag - 40 Servings | Brain Bullet | Energy Gum & Focus Gummy Upgrade

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Why We Love It

Instant focus for 8 hours.
Boosts productivity and mental clarity.
No crash, just smooth energy.

Main Highlights

INSTANT FOCUS & MENTAL CLARITY FOR UP TO 8 HOURS Stay sharp and in the zone with Brain Bullet Mint Matcha caffeine chews. Each chew delivers 80mg of caffeine and 160mg of L-Theanine—an elite nootropic duo that enhances focus and cognitive agility without the crash. A powerful alternative to caffeine pills, tablets, and energy gummies, these fast-acting chews fuel productivity for up to 8 hours. Perfect for students, professionals, shift workers, and high performers.
BOOST PRODUCTIVITY & BEAT BRAIN FOG Crush procrastination and kick brain fog to the curb. Brain Bullet Mint Matcha caffeine chews combine fast-absorbing energy with calm, laser-focused mental performance—kicking in within 5 minutes. Whether you're deep in study mode, powering through meetings, or grinding on a creative project, this potent blend keeps distractions at bay.
NO CRASH, NO JITTERS – JUST CLEAN ENERGY Forget the crash. Unlike sugary caffeine gummies or jittery caffeine tablets, Brain Bullet’s balanced L-Theanine and caffeine formula delivers smooth, lasting energy without spikes. It’s the ideal caffeine chew for long workdays, night shifts, and extended focus sessions.
LOW CALORIES, LOW SUGAR, HIGH IMPACT With just 26 calories and low sugar per chew, Brain Bullet Mint Matcha is a clean, smart way to power your day. Individually wrapped and easy to stash in your pocket or bag, these caffeine chews go wherever your mind needs to be sharp.
SUPPORT MEMORY, FOCUS & COGNITIVE FUNCTION Go beyond energy. Brain Bullet Mint Matcha supports memory retention, mental clarity, and overall brain health with its nootropic blend. Ditch the traditional caffeine pill or synthetic energy gummy and upgrade to a smarter, tastier brain boost.

New: L-Theanine - Natural Green Tea Extract (Decaf) - 120 Capsules - 300mg L-Theanine per Serving - Sleep & Relaxation Support - Mental Clarity - Non-Synthetic Theanine - UK Made - Zero Additives

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Why We Love It

Promotes relaxation and mental clarity.
Part of expert-recommended sleep supplement.
Made naturally without synthetic additives.

Main Highlights

✔️NATURAL SLEEP, RELAXATION AND FOCUS SUPPORT. L-theanine, an amino acid commonly found in green tea, offers several notable benefits. L-theanine has a calming effect on the mind- by increasing alpha wave activity, L-theanine promotes relaxation and helps manage symptoms of stress. This makes it an excellent natural option for individuals seeking a sense of tranquility and mental clarity.
✔️300MG PER 2 CAPSULE SERVING, RECOMMENDED BY EXPERTS. Leading neuroscientist Dr. Andrew Huberman recommends taking L-theanine as part of the 'sleep cocktail', a combination of powerful supplements (L-Theanine, Magnesium, and Apigenin) that work synergistically to improve the quality and duration of sleep.
✔️100% NON SYNTHETIC, DECAFFEINATED GREEN TEA EXTRACT, VEGAN WITH NO FILLERS, BINDERS OR OTHER ADDITIVES. Many L-Theanine products on the market are 100% synthetic, ours is naturally extracted from green tea (decaffeinated). At Time Health we believe in clean nutrition which is why you won't find any nasty stuff in our products including any binders, fillers or additives, unlike some of our competitors.
✔️UK MADE & HIGH QUALITY. This product is manufactured in the UK to GMP standards, ensuring the highest quality.
✔️OVER 82,000 TREES PLANTED AND COUNTING. We are proud supporters of Ecologi’s reforestation projects and plant a tree with every single order!
Please note: packaging may vary.

Vyper Caffeine Gum with L-Theanine – 72 Energy Chews - Fast Acting Caffeine Chewing Gum in Peppermint – Sugar Free, Vegan, Gluten Free - 12 Packets

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Why We Love It

Fast energy boost in minutes.
Enhanced focus with L-Theanine.
Sugar free and vegan friendly.

Main Highlights

FAST ACTING CAFFEINE BOOST – One sugar free caffeine chew provides the caffeine content equivalent to one 250ml can of energy drink in just ten minutes! The chewing action of our Vyper caffeine gum releases the caffeine directly into your bloodstream for fast absorption through the mucous membranes in your mouth.
ENERGY CHEWING GUM - Caffeine is a mild stimulant that speeds up the messages between our brain and body, blocking the receptors of the adenosine neurotransmitter, which increases levels of other neurotransmitters in your brain, including dopamine, that regulate your energy levels. It can relieve tiredness and fatigue and increase stamina, giving you the boost you need any time of the day!
ADDED L-THEANINE FOR FOCUS – Our energy peppermint chewing gum caffeine has been boosted with the amino acid L-Theanine, which can help ease anxiety, and stress and provide clarity and focus just when you need it to help improve mental function whether working late or doing sport!
INCREASES STAMINA – Our healthy pre workout chews are the ideal sports nutrition product to provide a caffeine boost before activity, exercise or sport, whether you’re cycling, hiking or training for a marathon! It’s also the perfect pick-me-up before a night out or the ideal kickstart caffeine gum to start the day! And because it relieves fatigue and tiredness, it’s the ideal go to caffeine uplift if you’re working late or pulling an all-nighter.
PROVIDES CLARITY & ENERGY – Vyper peppermint caffeine energy chews contain zero added sugar and are both gluten free and vegan friendly, providing the energy boost you need when you need it. At just 5kcal each caffeine gum, they’re suitable for adults, both men and women, and provide your body with an energy kick equivalent to the amount of caffeine from a standard 250ml energy drink.

NeuroCalm® Cortisol Reducing Supplement - Saffron, KSM-66 Ashwagandha, L-Theanine, Magnesium, Lemon Balm, Red Clover - Relax & Unwind - 90 Capsules - UK Made – GMP Standards – Zero Additives

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Why We Love It

Promotes inner calm and balance.
Vegan, clean nutrition standards upheld.
Supports reforestation with each order.

Main Highlights

✔️FIND YOUR INNER CALM. NeuroCalm contains a premium blend of research-backed ingredients to manage symptoms of stress, calm the mind, and balance mood.
✔️UK MADE TO GMP STANDARDS, 100% VEGAN WITH NO FILLERS, BINDERS OR ADDITIVES. At Time Health we believe in clean nutrition which is why you won’t find any nasty stuff in our products including any binders, fillers or additives, unlike some of our competitors.
✔️OVER 100,000 TREES PLANTED AND COUNTING. We are proud supporters of Ecologi’s reforestation projects and plant a tree with every single order!
Please note: packaging may vary.

High strength and bioavailable.
One capsule daily regimen.
Natural, allergen-free, vegan-friendly.

Main Highlights

SOFT MOMENTS, SIMPLE CHOICES: L-Theanine is an amino acid found in green tea, long used in East Asian tea rituals. Traditionally rooted and simply formulated, it brings a holistic approach to modern routines. Each capsule delivers 400mg of L-Theanine, 8mg of black pepper extract, and 0.5mg of vitamin B6. Inspired by centuries of tradition and adapted for everyday simplicity.
180 CAPSULES - 6 MONTHS SUPPLY: Each serving of WeightWorld's L-Theanine supplement provides 180 capsules, offering 6 months of supply. With just 1 capsule of this theanine supplement a day, WeightWorld aims to provide the most suitable supplement in its natural form with no bitter aftertaste and a gentle formulation.
ADDED BLACK PEPPER & VITAMIN B6: Each capsule of this L-Thenaine Supplement contains 8mg of black pepper extract and 0.5mg of vitamin B6, offering a well-rounded combination. Vitamin B6 contributes to the regulation of hormonal activity. Vitamin B6 contributes to normal homocysteine metabolism. Vitamin B6 contributes to normal psychological function. Vitamin B6 contributes to the normal function of the immune system. Vitamin B6 contributes to the reduction of tiredness and fatigue (EFSA Claims).
VEGAN THEANINE SUPPLEMENT: Manufactured in the UK under strict GMP guidelines, WeightWorld's L-Theanine Capsules are gluten-free, non-GMO, and vegan-friendly, making them suitable for various dietary preferences and lifestyles. Developed for easy consumption, they provide a straightforward way to get a daily dose of L-Theanine without any hassle.
THE JOURNEY OF WEIGHTWORLD: Born from a passion for food supplements, WeightWorld has been growing since 2006. With nearly two decades of experience, the brand offers a wide range of products, including vitamins, minerals, plant-based supplements, devices, and more. Now reaching multiple countries, the focus remains on developing products that evolve with changing needs while staying true to the values that started it all.

Caffeine 100mg and Theanine 160mg Complex | Pure | Vegan (180 Capsules)

Why We Love It

Boosts endurance and delays fatigue.
Specially formulated for vegetarians/vegans.
Combination of caffeine and theanine.

Main Highlights

Each capsule provides 100mg Caffeine & 160mg Theanine.

90Pcs L theanine Supplements, Energy & Focus Gum, With L-theanine and Natural Caffeine, For Energy & Focus Peppermint Chewing Gum with B-Vitamins, Sugar-Free Dietary Supplement

15% Off

Why We Love It

Instant energy without jitters.
Refreshing peppermint flavor delights.
Convenient for on-the-go lifestyles.

Main Highlights

INSTANT ENERGY BOOST: Each piece contains exactly the right amount of caffeine to give you a quick energy boost without the jitters. It's the perfect way to stay alert and focused without the hassle of coffee or energy drinks; Experience the clean focus of premium caffeine gum anytime.
REFRESHING PEPPERMINT FLAVOR: Enjoy a long-lasting, invigorating mint taste that not only makes you feel fresh but also freshens your breath, making it ideal for any occasion; Savor the crisp burst of peppermint in every piece of our energizing chewing gum.
CONVENIENT & ON-THE-GO: It's easy to use and perfect for when you're out and about. These sugar-free gums are small and easy to carry. You can fit them in your pocket, handbag or rucksack. This means you can have a energy boost whenever you need it; Grab a stick of this powerful extra chewing gum for instant, portable focus wherever life takes you.
SUGAR-FREE AND LOW-CALORIE: We make our gum especially for people who care about their health. It has no sugar and low calories, so you can enjoy an energy boost without feeling any guilt; Choose smart, healthy energy with neuro gum – supporting clarity and well-being.
MORE PRODUCTIVITY: Whether you're studying, working, or driving, the caffeine in our gum helps improve your concentration; Stock up smartly with our value chewing gum bulk packs to ensure peak performance is always within reach.

L Theanine 400mg Capsules - 99.6% Pure L-Theanine | 5 Months Supply - 150 Capsules | Supports Relaxation & Focus, Promotes Calm | Zero Additives, Vegan & Non-GMO | GMP - Certified, Lab Tested

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Why We Love It

Natural calming properties for relaxation.
Clinically suggested effective daily dose.
High purity through advanced extraction.

Main Highlights

Green Tea Derived: Sourced from green tea leaves, our L theanine supplement offers a natural, plant-based supplement known for its calming and wellness-enhancing properties, perfect for everyday relaxation.
Clinically Suggested Dose: Each L theanine organic supplement delivers the recommended 400mg daily dose of L-Theanine and offers a five-month supply. It is non-GMO, gluten-free, vegan-friendly, and free from additives.
Clean Extraction for Purity: Our L theanine capsule is extracted using the supercritical CO₂ extraction method and dried through vacuum drying, ensuring superior purity of 99.6%. By using these advanced methods, our L Theanine organic supplement becomes more safer and purer than supplements that rely on solvent extraction and heat drying.
Manufactured with Strict Standards: Produced in compliance with GMP (Good Manufacturing Practice) guidelines in a US FDA - inspected and approved facility. It is certified for HACCP, Halal, and Kosher, making it suitable for a wide range of dietary needs.
Third-Party Lab Tested: Each batch of our extra strength L theanine capsule undergoes rigorous testing by an ISO/IEC 17025:2017 accredited Eurofins lab to ensure it meets strict regulatory standards, providing confidence in its quality.

Igennus Healthcare Nutrition

Focus - Nootropic Brain Supplement for Concentration with Methylated B-Vitamins, Taurine, L-Tyrosine, L-Theanine & 200mg Caffeine, Zinc and Copper, 60 Capsules, by Igennus

17% OffFree Shipping

Why We Love It

Boosts concentration and mental energy.
Promotes calm, relaxed focus.
Enhances memory and attention.

Main Highlights

OVERCOME BRAIN FOG WITH MENTAL CLARITY - effective nutrient blend to provide a boost to concentration, mental energy & alertness when studying, working, exercising or feeling fatigued
NATURAL NOOTROPIC - formulated with taurine, L-Theanine & L-Tyrosine to support neurotransmitters, alpha wave production & brain-derived neurotrophic factor (BDNF) levels
HIGH ABSORPTION NUTRIENTS - methylated B-vitamins and chelated minerals including zinc and copper provide additional support for improved mental performance, memory, attention & cognitive processes
FAST ACTING & NO CRASH - we combine caffeine with L-Theanine for a calm, relaxed focus without leaving you over-stimulated and jittery or unable to sleep - take 30-60 minutes before desired effects
PURE & CLEAN - we only use hypoallergenic ingredients with no unnecessary additives (such as silicon dioxide or magnesium stearate), lab verified, vegan, GMP manufactured in the UK

8.7

Excellent

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We scanned 1290 products

We reviewed these offers relevant to the L Theanine Caffeine within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Caffeine Bullet, Time Health, Vyper, WeightWorld, Peak Supps, BlueSea home, NUTRINATION, Igennus Healthcare Nutrition, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best L Theanine Caffeine in the market, we considered we took a deep dive into 6451 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Old Recipe | 80mg Caffeine & 160mg L-Theanine Focus Enhancing Energy Chews – Neuroscience Backed Nootropic Stack, Mental Acuity & Cognitive Support | Mint Matcha Flavor Brain Bullet, 1 Bag. We love many things about this product by Caffeine Bullet. What sets it apart from the competition is Instant focus for enhanced productivity. , No crash for sustained energy. , Low-calorie formula for guilt-free snacking. .
The best value product for most shoppers and where user satisfaction is continuously the highest is 160mg L-Theanine + 80mg Caffeine Chews – Mint Matcha Flavour, Increases Productivity, Mental Clarity, Alertness | 1 Bag - 40 Servings | Brain Bullet | Energy Gum & Focus Gummy Upgrade by Caffeine Bullet based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for L Theanine Caffeine and the best cost-to-value ratio is L Theanine 400mg Capsules - 99.6% Pure L-Theanine | 5 Months Supply - 150 Capsules | Supports Relaxation & Focus, Promotes Calm | Zero Additives, Vegan & Non-GMO | GMP - Certified, Lab Testedat NUTRINATION with a 25% discount.
Our list of the best L Theanine Caffeine is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best L Theanine Caffeine in The UK

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We scanned 1290 products

We concluded that: