📋 Food Supplement: L-Theanine capsules are a food supplement — not a medicine. Not intended to diagnose, treat, cure or prevent any disease. Consult a healthcare professional before use if pregnant, breastfeeding, taking medication or under medical supervision.
🌿 L-Theanine 600mg Capsules UK — What Makes This Different?
L-Theanine 600mg capsules from Charge Products deliver a clearly declared 600mg of L-Theanine per capsule — 20% more than the standard 500mg format sold by the majority of UK supplement brands. L-Theanine is a naturally occurring amino acid from green tea (Camellia sinensis) — one of the most widely studied natural nootropics in the world, researched for its ability to promote relaxation without drowsiness by increasing alpha brain wave activity.
Each capsule contains 600mg pure L-Theanine — no fillers, no binders, no anti-caking agents, nothing else. The capsule shell is HPMC (hydroxypropyl methylcellulose) — a plant-derived vegan capsule with no gelatin and no animal-derived ingredients. Suitable for vegans and vegetarians.
Available in 60, 120, 180 and 300 capsule packs — from a 60-day starter supply through to a 300-day long-term supply. Supplied by Charge Products — an established UK supplement supplier since 2016 with 149,000+ verified marketplace sales and a 5 Star Food Hygiene Rating. UK-held stock, same-day dispatch before 3:30pm Mon–Fri.
🔬 What Does L-Theanine Do? — The Science Behind 600mg Capsules
🧠 Alpha Brain Waves & Focus
L-Theanine significantly increases alpha brain wave activity — the neural state associated with calm alertness, creative focus and mental clarity. Research by Nobre et al. (2008) confirmed L-Theanine produces this alpha wave effect within 40 minutes of ingestion, without causing drowsiness or sedation.
🌿 Relaxation Without Drowsiness
Unlike sedatives or antihistamines, L-Theanine promotes relaxation while maintaining full alertness. It increases GABA, dopamine and serotonin levels — reducing anxiety and promoting calm without impairing cognitive function. You stay alert — just calmer and more focused.
☕ Caffeine Synergy
The L-Theanine + caffeine combination is one of the most researched nootropic stacks. Research by Haskell et al. (2008) showed the combination improved speed and accuracy on demanding cognitive tasks versus caffeine alone. L-Theanine smooths the edge of caffeine — clean energy without the jitter.
😴 Sleep Quality Support
Research by Lyon et al. (2011) showed L-Theanine improved sleep percentage and sleep efficiency. It reduces sleep latency (the time to fall asleep) and sleep disruptions by promoting relaxation and GABA activity. Does not cause morning grogginess — popular for pre-bedtime use at higher doses.
🧬 Stress & Cortisol
Research by Kimura et al. (2007) showed L-Theanine attenuated physiological stress responses — reducing heart rate and salivary IgA responses to acute psychological stress. A 2019 study (Hidese et al.) found 4 weeks of L-Theanine administration reduced stress-related anxiety and depression scores.
💡 Working Memory & Cognition
Baba et al. (2021) found L-Theanine may enhance working memory, executive function and sustained attention. Hidese et al. (2019) found verbal fluency and executive function scores improved after 4 weeks of supplementation versus placebo.
🧪 L-Theanine 600mg Capsules — Full Specification
| Specification | Detail |
|---|---|
| L-Theanine Per Capsule | 600mg — higher strength than standard 500mg capsules |
| Capsule Shell | HPMC — plant-derived · vegan · no gelatin |
| ✅ No Fillers or Binders | No maltodextrin · no rice flour · no magnesium stearate · no silicon dioxide |
| Suitable For | Vegans · Vegetarians · Adults |
| Pack Sizes | 60 · 120 · 180 · 300 capsules |
| Supply Duration | 60 caps = 60 days · 120 caps = 120 days · 180 caps = 180 days · 300 caps = 300 days (at 1/day) |
| Source | Camellia sinensis (green tea) amino acid |
| Dispatch | 🇬🇧 UK Stock — Same-day before 3:30pm Mon–Fri |
⚖️ 600mg vs 500mg — Why Strength Matters
| Factor | Charge Products 600mg | Standard 500mg Capsules |
|---|---|---|
| L-Theanine per capsule | ✅ 600mg | 500mg |
| Strength vs standard | ✅ 20% more per capsule | Standard strength |
| Capsule shell | ✅ Vegan HPMC | Often gelatin |
| Fillers & binders | ✅ None | Commonly rice flour or maltodextrin |
| Supplier verification | ✅ 149,000+ verified sales · eBay · Trustpilot | Often not independently verifiable |
| Food Hygiene Rating | ✅ 5 Star — independently awarded | Rarely declared |
💡 How to Take L-Theanine 600mg Capsules UK
Suggested Use
- Focus / daytime use: 1 capsule (600mg)
- Sleep / relaxation: 1 capsule 30–60 mins before bed
- Caffeine stack: 1 capsule alongside coffee or caffeine
- Stress support: 1 capsule as needed
When to Take
- Can be taken with or without food
- Morning — for daytime focus and calm alertness
- Pre-bedtime — for sleep quality support
- Before demanding cognitive tasks
- Alongside a coffee or caffeine source for stacking
☕ Caffeine stack tip: Take 1 × 600mg L-Theanine capsule alongside your morning coffee or caffeine supplement. The 2:1 L-Theanine:caffeine ratio is the most studied nootropic combination — clean, focused energy without jitteriness or anxiety. Also pairs well with our Caffeine & PEA capsules for a full dopamine + focus stack.
📦 Choose Your Pack Size
| Pack Size | Best For | Supply at 1/day |
|---|---|---|
| 60 Capsules | ⭐ First time — try before committing to larger | 2 months |
| 120 Capsules | ✅ Best value — established users | 4 months |
| 180 Capsules | Long-term daily users | 6 months |
| 300 Capsules | 📦 Maximum supply — best per-capsule price | 10 months |
📚 Academic References — L-Theanine Research
Peer-reviewed research cited for educational context only — not product claims.
- PubMed — Nobre AC et al. — L-theanine, a natural constituent in tea, and its effect on mental state (2008) — L-Theanine significantly increases alpha brain wave activity, promoting relaxed alertness within 40 minutes of ingestion
- PubMed — Haskell CF et al. — The effects of L-theanine, caffeine and their combination on cognition and mood (2008) — combination improved speed and accuracy on attention-switching tasks and reduced susceptibility to distracting information
- PubMed — Hidese S et al. — Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions (2019) — stress-related scores including anxiety and depression decreased; verbal fluency and executive function improved after 4 weeks
- PubMed — Baba Y et al. — Effects of L-Theanine on Cognitive Function in Middle-Aged and Older Adults (2021) — enhanced working memory, executive function and attention
- PubMed — Kimura K et al. — L-Theanine reduces psychological and physiological stress responses (2007) — attenuated heart rate and salivary IgA responses to acute stress
- PubMed — Lyon MR et al. — The effects of L-theanine on objective sleep quality (2011) — improved sleep percentage and sleep efficiency scores
All references for educational background only. Food supplement — not a medicine. No therapeutic claims made or implied.
per capsule
500mg standard
or binders
since
sales
Rating
🛒 Also Available on eBay UK
L-Theanine 600mg Capsules — Higher Strength · UK Seller · Fast Dispatch
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⭐ What Our Customers Say — Verified Trustpilot Reviews
Reviews from verified UK buyers on Trustpilot ↗
★★★★★
"Really VERY good!"
"I've been buying from Charge for about 7 or 8 years by now, and I can assure you everything I've bought is high quality with prompt delivery. Great job, folks."
Carole · GB · 54 reviews · Nov 2025 · ✓ Verified
★★★★★
"Consistently outperforms other brands"
"We have tested a few brands and the performance of the products from Charge consistently out perform the others."
KP · GB · 3 reviews · Jun 2025 · ✓ Verified
★★★★★
"Top quality friendly professional service"
"Top quality friendly professional service and super fast (Free) delivery!"
Customer · GB · 7 reviews · Jan 2026 · ✓ Verified
★★★★★
"Great quality and speedy delivery"
"Great quality and speedy delivery — would definitely recommend Charge Products to anyone looking for quality supplements."
Miss Toni Lewis · GB · Feb 2026 · ✓ Verified
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Full amino acid range
🛒 Where to Buy L-Theanine 600mg Capsules UK
Looking to buy L-Theanine capsules UK? Charge Products supplies 600mg L-Theanine capsules — higher strength than the standard 500mg format — direct to UK retail and trade customers. Buy L-Theanine UK from an established supplier trading since 2016. Where to buy L-Theanine UK? Direct from this Shopify store or via the eBay listing below — both ship from the same UK-held stock with same-day dispatch. You can also order L-Theanine capsules UK in packs of 60, 120, 180 or 300.
❓ Frequently Asked Questions — L-Theanine 600mg Capsules UK
What does L-Theanine do?
L-Theanine crosses the blood-brain barrier and increases alpha brain wave activity — the neural state of calm, alert focus. It modulates GABA, dopamine and serotonin — promoting relaxation without drowsiness. Research has studied it for focus, stress reduction, sleep quality and cognitive performance, particularly in combination with caffeine.
Why 600mg instead of the standard 500mg?
These capsules provide 600mg per capsule — 20% more L-Theanine than the standard 500mg format sold by most UK brands. This is clearly declared for transparency. Buyers who want a higher declared quantity per capsule at a competitive price per mg will find this a stronger value option.
Can I stack L-Theanine with caffeine?
Yes — this is one of the most studied nootropic combinations. L-Theanine reduces caffeine jitteriness while preserving its alertness benefit. Take one 600mg L-Theanine capsule alongside your morning coffee or caffeine supplement for clean focused energy. Also pairs well with our Caffeine & PEA capsules.
Are these capsules vegan?
Yes — 100% vegan and vegetarian. HPMC plant-derived capsule shell — no gelatin. No fillers, no binders, no animal-derived ingredients of any kind.
When should I take L-Theanine capsules?
Any time of day — L-Theanine does not cause drowsiness. For focus and caffeine stacking: morning or before demanding tasks. For sleep support: 30–60 minutes before bed. For stress and relaxation: as needed during the day.
What is the difference between L-Theanine capsules and powder?
Capsules provide a fixed pre-measured 600mg dose — convenient, portable, no measuring required. Powder allows fully flexible dosing and is more cost-effective per gram at larger quantities. For daily supplementation, capsules are most convenient. For bulk supply, stacking or custom dosing, see our L-Theanine powder.
📍 Charge Products — UK Supplement Supplier & Wholesaler
Charge Products is an established UK supplement supplier and wholesale L-Theanine capsules supplier UK with over 10 years of verified trading history, 149,000+ marketplace sales and a 5 Star Food Hygiene Rating. We supply food supplement capsules — including L-Theanine 600mg capsules, Magnesium & L-Theanine capsules, Caffeine & PEA capsules, NMN, vitamins, minerals and a wide range of amino acid and botanical products — to retail customers, trade buyers, resellers and wholesale purchasers across the United Kingdom, maintaining UK-held stock and transparent ingredient labelling standards throughout our entire product range.
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Disclaimer: This product is a food supplement — not a medicine. Not intended to diagnose, treat, cure or prevent any disease. Academic references cited for educational background only — not product claims. Always consult a healthcare professional before use if pregnant, breastfeeding, taking medication or under medical supervision. Keep out of reach of children. Store in a cool, dry place. Do not exceed the recommended daily dose.
| Capsules |
60 x Capsules, 120 x Capsules, 180 x Capsules, 300 x Capsules |
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