📋 Food Supplement / Food-Grade Ingredient: L-Theanine is sold in the UK as a food supplement ingredient. Not a medicine. Not intended to diagnose, treat, cure or prevent any disease or medical condition. No authorised EU/UK health claims exist specifically for L-Theanine as a food supplement. All information on this page is for educational and transparency purposes only. Published April 2025.
🍵 What Is L-Theanine?
L-Theanine (chemical name: N-ethyl-L-glutamine, CAS 3081-61-6, molecular formula C7H14N2O3) is a naturally occurring amino acid analogue found predominantly in the leaves of Camellia sinensis — the green tea plant. It is one of the primary non-protein amino acids in tea and is responsible for the characteristic umami taste associated with high-quality green teas.
In the UK, L-Theanine is sold as a food supplement ingredient — not a medicine. It has been widely available in the UK supplement market for over two decades and is one of the most consistently popular amino acid supplements sold online.
🔬 Key Facts — L-Theanine
- Chemical name: N-ethyl-L-glutamine
- CAS number: 3081-61-6
- Molecular formula: C7H14N2O3
- Natural source: Camellia sinensis (green tea plant)
- UK regulatory status: food supplement ingredient — not a medicine
- No authorised EU/UK health claims exist for L-Theanine
- Commonly combined with caffeine in supplement formulations
- Available in powder and capsule formats
⚗️ Powder vs Capsules — Which Format Is Right?
L-Theanine is available in two main formats — powder and capsules. Each has different practical advantages depending on how you intend to use it:
| Factor | Powder ← This | Capsules |
|---|---|---|
| Flexibility | Full — weigh your own dose ✅ | Fixed dose per capsule |
| Use in drinks | Yes — dissolves in water or tea ✅ | Not applicable |
| Bulk / wholesale | Available from 25g to kg ✅ | Fixed pack sizes only |
| Formulation use | Yes — encapsulate or blend ✅ | Ready to use |
| Convenience | Requires measuring | Pre-measured — easy ✅ |
| Cost per gram | Lower — especially in bulk ✅ | Slightly higher per gram |
🔬 Academic Research — Educational Context
L-Theanine is one of the most studied amino acids in nutritional science, particularly in the context of its combination with caffeine. The following peer-reviewed references are provided for educational context only — not as health claims for this product:
- Nobre AC, et al. "L-theanine, a natural constituent in tea, and its effect on mental state." Asia Pacific Journal of Clinical Nutrition, 2008; 17 Suppl 1:167–168. PubMed 18296328 — review of L-theanine's alpha wave activity in the brain; 16 healthy volunteers
- Owen GN, et al. "The combined effects of L-theanine and caffeine on cognitive performance and mood." Nutritional Neuroscience, 2008; 11(4):193–198. PubMed 18681988 — 27 participants; combined caffeine and L-theanine effects on attention tasks
- Kimura K, et al. "L-Theanine reduces psychological and physiological stress responses." Biological Psychology, 2007; 74(1):39–45. PubMed 16930802 — 12 participants; L-theanine 200mg; self-reported stress measures
- Haskell CF, et al. "The effects of L-theanine, caffeine and their combination on cognition and mood." Biological Psychology, 2008; 77(2):113–122. PubMed 18006208 — 35 participants; crossover study design
Provided for educational context only — not health claims. These references do not constitute claims for this product. L-Theanine is a food supplement — not a medicine.
💊 Full Specification — L-Theanine Powder
| Specification | Detail |
|---|---|
| Ingredient name | L-Theanine (N-ethyl-L-glutamine) |
| CAS number | 3081-61-6 |
| Molecular formula | C7H14N2O3 |
| Natural source | Camellia sinensis (green tea) |
| Physical form | White crystalline powder · water soluble |
| Taste | Mild umami — characteristic of green tea |
| Common combinations | Caffeine · L-Tyrosine · Magnesium |
| Health claims | No authorised EU/UK health claims for L-Theanine |
| Classification | Food supplement ingredient — not a medicine |
| UK dispatch | 🇬🇧 UK stock — same-day before 3:30pm Mon–Fri ✅ |
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🛒 Where to Buy L-Theanine Powder UK
You can buy L-Theanine powder UK and order L-Theanine UK direct from Charge Products on this website. Available from small retail quantities to wholesale and bulk supply. For bulk L-Theanine UK or wholesale L-Theanine UK contact via the trade enquiries page. UK-held stock, same-day dispatch before 3:30pm Mon–Fri.
🍵 L-Theanine Powder & Capsules — Charge Products UK
Pure L-Theanine · Retail to Bulk · UK Supplier Since 2016
149,000+ verified sales · 5 Star Food Hygiene · same-day dispatch
L-Theanine Powder Wholesale UK · Bulk L-Theanine · Trade Supply
Pure L-Theanine · Food-Grade · UK Supplier Since 2016
buy L-Theanine powder UK · L-Theanine wholesale UK · bulk L-Theanine UK · L-Theanine supplier UK · L-Theanine trade supply UK — supplying formulators, resellers and trade buyers from UK-held stock since 2016.
Wholesale & Trade Enquiries →🔗 Related Amino Acid & Focus Supplements
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Authorised mineral claims 🧬 All Amino Acid Supplements
Full UK amino acid range
❓ Frequently Asked Questions
What is L-Theanine?
L-Theanine (N-ethyl-L-glutamine, CAS 3081-61-6) is a naturally occurring amino acid analogue found predominantly in the leaves of Camellia sinensis — the green tea plant. Sold in the UK as a food supplement ingredient — not a medicine. No authorised EU/UK health claims exist for L-Theanine.
Is L-Theanine powder better than capsules?
Neither is inherently better — it depends on use case. Powder offers flexible dosing, easy mixing into drinks, lower cost per gram in bulk, and formulation flexibility. Capsules offer convenience and pre-measured doses. The underlying ingredient is the same.
Can L-Theanine powder be mixed into drinks?
Yes — L-Theanine powder is water soluble and can be dissolved into water, tea, coffee or other beverages. It has a mild, slightly umami taste characteristic of green tea — generally considered unobtrusive in drinks.
Is L-Theanine a medicine?
No — L-Theanine is a food supplement ingredient in the UK. Not a licensed medicine. Not intended to diagnose, treat, cure or prevent any disease or medical condition. No authorised EU/UK health claims exist for L-Theanine.
What is the commonly used dose of L-Theanine powder?
This is a question for your healthcare professional. Published academic studies have used a range of doses — typically 100–200mg per serving. Always follow label guidance and consult a healthcare professional before use.
Can I buy L-Theanine powder wholesale UK?
Yes — wholesale and bulk L-Theanine powder available from UK-held stock. Same-day dispatch. Contact Charge Products via the trade enquiries page for bulk pricing.
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Disclaimer: L-Theanine Powder is a food supplement ingredient — not a licensed medicine. Not intended to diagnose, treat, cure or prevent any disease or medical condition. No authorised EU/UK health claims exist for L-Theanine as a food supplement. All information on this page is provided for educational and transparency purposes only. PubMed references are provided for educational context only and do not constitute health claims for this product. Consult a healthcare professional before use if taking prescription medication, pregnant, breastfeeding or have a medical condition. Not suitable for under 18s. Store below 25°C away from direct sunlight. Keep out of reach of children. Best before: see packaging. Food supplement ingredient — not a medicine. Published April 2025.
