📋 Food Supplement: L-Theanine powder is a food supplement — not a medicine. Not intended to diagnose, treat, cure or prevent any disease. Always consult a healthcare professional before use if pregnant, breastfeeding, taking medication or under medical supervision.
🌿 What Is L-Theanine Powder? — Pure Amino Acid Supplement UK Explained
L-Theanine powder is one of the most widely used nootropic amino acids in the UK — found naturally in green tea leaves (Camellia sinensis) and certain mushroom species. It is structurally similar to glutamine and crosses the blood-brain barrier with ease, where it increases alpha brain wave activity — the neural state associated with calm, alert focus without drowsiness or sedation.
This L-Theanine powder UK supply from Charge Products is 100% pure L-Theanine — no fillers, no binders, no anti-caking agents, nothing else. This L-Theanine powder bulk UK supply is available from 50g retail sizes up to 100kg bulk and wholesale formats, making it suitable for individual supplementation, custom formulation, repackaging and large-scale trade supply. The powder format allows fully flexible dosing — users can measure precisely from 50mg upwards and mix directly into drinks, smoothies or capsules.
The caffeine and L-Theanine combination is one of the most studied nootropic stacks in the world. Research consistently shows the two compounds work synergistically — caffeine provides alertness, L-Theanine smooths the edge by promoting alpha brain waves. The result is focused energy without the jitteriness associated with caffeine alone.
Supplied by Charge Products — an established UK supplement supplier since 2016 with 149,000+ verified marketplace sales and an independently awarded 5 Star Food Hygiene Rating. UK-held stock. Same-day dispatch before 3:30pm Mon–Fri.
🔬 What Does L-Theanine Do? — The Science
L-Theanine is one of the most studied natural amino acids for cognitive and relaxation support. Research has explored its role across five key areas — all referenced with peer-reviewed sources below.
🧠 Alpha Brain Waves & Focus
L-Theanine significantly increases alpha brain wave activity — the neural state associated with calm alertness, creative thinking and focused concentration. Alpha waves are typically observed during meditation and flow states. L-Theanine can produce this state without sedation.
🌿 Relaxation Without Drowsiness
Unlike sedatives or sleep aids, L-Theanine promotes relaxation without causing drowsiness. It increases GABA, dopamine and serotonin levels in the brain — reducing anxiety and promoting a calm mental state while maintaining full alertness and cognitive function.
😴 Sleep Quality Support
Research has shown L-Theanine may reduce sleep latency (the time it takes to fall asleep) and reduce sleep disruptions. It synergises with GABA to increase sleep quality and duration. Does not cause next-day grogginess — making it popular for pre-bedtime use.
☕ Caffeine Synergy Stack
The L-Theanine and caffeine combination is one of the most researched nootropic stacks. L-Theanine reduces caffeine-associated jitteriness and anxiety while preserving its alertness benefit. The combination has been shown to improve speed and accuracy of performance on cognitive tasks versus caffeine alone.
🧬 Stress & Cortisol Response
Studies have shown L-Theanine may reduce cortisol levels and physiological stress markers. In stress tests, supplementation attenuated heart rate and salivary IgA responses to acute psychological stress. Research links L-Theanine to improved stress-related symptoms including depression and anxiety traits.
💡 Working Memory & Cognition
2021 research indicated L-Theanine may contribute to enhanced working memory, executive function and improved attention. A 2019 study found that 4 weeks of L-Theanine administration improved cognitive function scores including verbal fluency and executive function versus placebo.
🧪 L-Theanine Powder UK — Full Specification
| Specification | Detail |
|---|---|
| Ingredient | L-Theanine (γ-glutamylethylamide) |
| Purity | 100% pure L-Theanine amino acid powder UK — nothing added |
| Source | Camellia sinensis (green tea) — enzymatic synthesis |
| ✅ No Fillers or Binders | No maltodextrin · no silicon dioxide · no anti-caking agents · nothing else |
| Format | Loose powder — dissolves readily in water, tea and coffee |
| Taste | Mild umami — similar to green tea · no bitterness |
| Sizes Available | 50g · 100g · 250g · 500g · 1kg · 2kg · 3kg · 5kg · 10kg · 15kg · 25kg · 50kg · 60kg · 100kg |
| Suitable For | Vegetarians & Vegans · Adults |
| Packaging | Resealable food-grade foil bag |
| Dispatch | 🇬🇧 UK Stock — Same-day before 3:30pm Mon–Fri |
💡 How to Use L-Theanine Powder UK
Typical Serving Sizes
- Relaxation / stress support: 100–200mg
- Focus / cognitive support: 150–250mg
- Sleep support (pre-bedtime): 200–400mg
- With caffeine stack: 1:1 or 2:1 L-Theanine:caffeine ratio
How to Take
- Dissolve in water, tea, coffee or a smoothie
- Can be taken on an empty stomach or with food
- For sleep support — take 30–60 minutes before bed
- For caffeine stack — mix together in the same drink
- Use a digital scale for precise measurement
☕ Popular stack: Mix 200mg L-Theanine with 100mg caffeine (or a standard coffee) for clean focused energy — the classic 2:1 theanine:caffeine nootropic combination used by students, professionals and athletes worldwide.
⚖️ L-Theanine Powder vs Capsules UK — Which Is Right for You?
| Factor | L-Theanine Powder | L-Theanine Capsules |
|---|---|---|
| Dosing flexibility | ✅ Fully flexible — any amount | Fixed per capsule |
| Cost per gram | ✅ More cost-effective | Higher per gram |
| Stacking with caffeine | ✅ Mix directly into drink | Take separately |
| Wholesale / bulk supply | ✅ Up to 100kg available | Retail only |
| Convenience | Requires measuring | ✅ Pre-measured · travel-friendly |
| Custom formulation | ✅ Ideal for formulation | Not applicable |
👥 L-Theanine Powder UK — Who This Is For
📚 Students & Knowledge Workers
One of the most popular nootropic powders UK for study and focused work. Mix with morning coffee for the classic caffeine + L-Theanine stack — alertness without anxiety. Research shows the combination improves speed and accuracy on demanding cognitive tasks.
😴 Sleep Support Users
A popular pre-bedtime supplement — L-Theanine reduces sleep latency and improves sleep quality without causing morning grogginess. Does not suppress REM sleep. Particularly useful for those with racing thoughts at bedtime or stress-related sleep disruption.
🏭 Supplement Formulators & Trade
Bulk and wholesale L-Theanine powder UK for supplement manufacturers, repackagers and trade buyers. Available from 1kg to 100kg with UK-held stock and same-day dispatch. Suitable for capsule filling, powder blending and custom nootropic formulation.
🌿 Stress & Anxiety Management
Research links L-Theanine to reduced physiological stress markers including cortisol and heart rate response to acute stress. A popular natural stress support supplement for those seeking relaxation without pharmaceutical sedation or drowsiness.
📚 Academic References — L-Theanine Research
Peer-reviewed research cited on this page — educational background only. Not product claims.
- PubMed — Nobre AC et al. — L-theanine, a natural constituent in tea, and its effect on mental state — L-Theanine significantly increases alpha brain wave activity, promoting relaxed alertness without sedation
- PubMed — Haskell CF et al. — The effects of L-theanine, caffeine and their combination on cognition and mood — combination of L-Theanine and caffeine improved speed and accuracy of performance 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 symptoms including depression, anxiety and sleep scores decreased; cognitive function scores including verbal fluency and executive function improved after 4 weeks
- PubMed — Baba Y et al. — Effects of L-Theanine on Cognitive Function (2021) — L-Theanine may contribute to enhanced working memory, executive function and improved attention in middle-aged and older adults
- PubMed — Kimura K et al. — L-Theanine reduces psychological and physiological stress responses — L-Theanine attenuated sympathetic nervous system activation and salivary IgA response under acute stress
- PubMed — Lyon MR et al. — The effects of L-theanine on objective sleep quality in boys with ADHD — L-Theanine improved sleep percentage and sleep efficiency scores; safe and effective for improving certain aspects of sleep quality
- Frontiers in Nutrition — Li Y et al. — L-Theanine: A unique functional amino acid in tea with multiple health benefits (2022) — comprehensive review of L-Theanine bioactivity, GABA/dopamine/serotonin modulation and neuroprotective mechanisms
All references cited for educational background only. This product is a food supplement — not a medicine. No therapeutic or health claims are made.
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L-Theanine Powder UK — Retail & Bulk · Fast Dispatch
149,000+ verified sales · 10+ years trading · same-day dispatch · eBay Top Rated
L-Theanine Powder Wholesale UK · Bulk Amino Acid Supply · Trade
100% Pure L-Theanine · 1kg to 100kg · UK-Held Stock · Same-Day 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 of NMN and Resveratrol 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
★★★★★
"High quality and very reasonable price"
"The delivery took only a few days and the product was of high quality and a very reasonable price for its quantity, will definitely be ordering again."
Frank Soule · GB · 4 reviews · Aug 2025 · ✓ Verified
📖 Further Reading — L-Theanine Guides
Further Reading
From Charge Products
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❓ Frequently Asked Questions — L-Theanine Powder UK
What is L-Theanine powder?
L-Theanine is a naturally occurring amino acid found primarily in green tea (Camellia sinensis) and certain mushrooms. It crosses the blood-brain barrier readily and increases alpha brain wave activity — promoting calm, alert focus without drowsiness. It also modulates GABA, dopamine and serotonin levels, contributing to relaxation and stress reduction.
Can L-Theanine powder be taken with caffeine?
Yes — and this is one of the most popular nootropic combinations. L-Theanine reduces caffeine-associated jitteriness while preserving its alertness benefit. Research shows the combination improves speed and accuracy on demanding cognitive tasks versus caffeine alone. A typical ratio is 2:1 L-Theanine:caffeine — e.g. 200mg L-Theanine with 100mg caffeine.
Is L-Theanine powder available for wholesale and bulk supply?
Yes — available from 1kg to 100kg for wholesale and bulk buyers. Suitable for supplement manufacturers, repackagers, capsule fillers and trade buyers. UK-held stock with same-day dispatch. Contact us via the trade enquiries page for wholesale pricing and availability.
What does L-Theanine powder taste like?
L-Theanine has a mild, slightly umami taste — similar to green tea. It dissolves readily in water, tea or coffee without significantly altering the flavour. No bitterness and no chalky residue.
What is the difference between L-Theanine powder and capsules?
Powder allows flexible dosing, costs less per gram, is ideal for stacking with other ingredients and is available in bulk. Capsules offer a fixed pre-measured dose for convenience. For wholesale, formulation or custom stacking, powder is the recommended format.
Is L-Theanine suitable for vegans?
Yes — 100% suitable for vegans and vegetarians. Pure L-Theanine powder is the most popular nootropic powder UK amino acid choice — contains no animal-derived ingredients and no fillers or binders of any kind.
📍 Charge Products — UK Supplement Supplier & Wholesaler
Charge Products is an established UK supplement supplier and wholesale L-Theanine powder 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 powders — including L-Theanine powder, amino acids, NMN, vitamins, minerals and a wide range of botanical and herbal 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.
Visit Charge Products UK — Main Website →Commonly searched as: L-Theanine powder UK · buy L-Theanine powder UK · pure L-Theanine powder UK · L-Theanine powder bulk UK · L-Theanine amino acid powder UK · bulk L-Theanine UK · L-Theanine wholesale UK · L-Theanine powder 100g UK · L-Theanine powder 1kg UK · L-Theanine powder 500g UK · L-Theanine supplement UK · theanine powder UK · L-Theanine and caffeine stack UK · nootropic powder UK · amino acid powder UK · L-Theanine sleep UK · L-Theanine stress UK · L-Theanine focus UK · green tea amino acid supplement UK · L-Theanine no fillers UK
Disclaimer: This product is a food supplement — not a medicine. Not intended to diagnose, treat, cure or prevent any disease. No EU/UK authorised health claims are made for L-Theanine. Academic references cited for educational background only — not product claims or endorsements. Always consult a qualified 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.
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50 Grams, 100 Grams, 250 Grams, 500 Grams, 1 kilo, 2 kilo, 3 kilo, 5 kilo, 10 kilo, 15 kilo, 25 kilo, 50 kilo, 60 kilo, 100 kilo |
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