Last updated: September 2026
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41.3% ASSAY · GREEN TEA EXTRACT · UK STOCK SINCE 2016
L-Theanine Powder UK — Green Tea Extract Standardised to 40% Theanine
Extracted from Camellia sinensis · Cream to Beige Powder · Certificate Figures Published
This is a standardised extract, not a purified isolate. It is cream to beige, not white, because the balance of the material is other green tea leaf constituents. Everything the certificate states is published below, including what it does not cover.
Food supplement — not a medicine. There are no authorised UK health claims for L-theanine, so none are made here.
☕ CONTAINS NATURALLY OCCURRING CAFFEINE
Caffeine occurs naturally in green tea and the certificate specifies a maximum of 2.5%. That is roughly 12mg of caffeine per 500mg of powder, or about 25mg per gram.
If you are avoiding caffeine entirely, or taking theanine in the evening, this matters — and we would rather you knew before ordering than after. A purified isolate would not contain it; an extract does.
Buy L-theanine powder UK direct from Charge Products — a green tea extract standardised to 40% theanine and assayed at 41.3% by HPLC on current stock. Extracted from Camellia sinensis leaf rather than produced by fermentation or synthesis, which is the distinction that determines the novel food position in Great Britain and the single most useful thing to establish about any theanine material.
This is a standardised extract, not a purified isolate, and the page is written on that basis throughout. One gram provides approximately 413mg of theanine, so the dosing arithmetic is different from a 98% material and the two are not interchangeable. The powder is cream to beige rather than white, and it carries the tea polyphenols, EGCG and naturally occurring caffeine that come through a genuine leaf extraction.
Available from 50g through to 25kg for trade and formulation, in resealable food-grade foil at every size. UK-held stock, same-day dispatch before 3:30pm Monday to Friday, free UK delivery over £10. Order L-theanine powder UK with 10% off on subscription, or spread orders over £50 across 3 interest-free instalments. 163,000+ verified sales, 5 Star FSA rated facility, trading since 2016. Food supplement — not a medicine.
⚡ Quick Answer
Green tea extract standardised to 40% theanine and assayed at 41.3% by HPLC. Extracted from Camellia sinensis leaf — not fermentation-derived, not synthesised. The powder is cream to beige, and the shade varies slightly between batches because the leaf does. It contains naturally occurring tea polyphenols (30% min), EGCG (3% min) and caffeine (2.5% max). One gram provides approximately 413mg of theanine. This is not a purified 98% isolate and is not sold as one. UK-held stock dispatched same day before 3:30pm from our own 5 Star FSA rated facility in Essex. Subscribe and save 10%, or pay in 3 interest-free instalments. Food supplement — not a medicine.
Extract or Isolate — Know Which You Are Buying
Theanine is sold in two quite different forms and the listings often do not make it obvious which is which. This is the extract.
| This product — 40% extract | Purified isolate | |
|---|---|---|
| Theanine content | 41.3% | Typically 98%+ |
| Colour | Cream to beige | White crystalline |
| Rest of the material | Other green tea leaf constituents | Very little |
| Caffeine | Present — 2.5% max | Generally none |
| Typical production | Extraction from tea leaf | Often fermentation-derived |
| Powder per 200mg theanine | ~484mg | ~204mg |
If you need purified 98% material, this is not the right product. Both are legitimate; they are simply not interchangeable, and the dosing maths is completely different.
How Much Theanine Are You Actually Getting?
At a 41.3% assay. Rule of thumb: multiply the theanine you want by about 2.4 to get the powder weight.
| Powder weighed | Theanine provided | Caffeine (2.5% max) |
|---|---|---|
| 250mg | ~103mg | up to ~6mg |
| 500mg | ~207mg | up to ~12mg |
| 750mg | ~310mg | up to ~19mg |
| 1g | ~413mg | up to ~25mg |
| 100g | ~41.3g | up to ~2.5g |
No scoop is supplied. Digital milligram scales are needed — powder density varies and volume measures are not a reliable guide to weight.
Certificate Composition
Most extract listings publish an assay figure and nothing else. Here is what the certificate states for this material.
Composition
Theanine (HPLC, dry basis) — 41.3%
Tea polyphenols — 30% minimum
Other green tea constituents — 8.5%
Residue on ignition (mineral ash) — 3.7%
Loss on drying (moisture) — 3.4%
Caffeine — 2.5% maximum
Purity & safety
Lead — ≤10 ppm
Arsenic — ≤2 ppm
Cadmium — ≤1 ppm
Mercury — ≤0.1 ppm
Aerobic plate count — ≤1000 cfu/g
Yeasts & moulds — ≤100 cfu/g
Coliforms — negative
The "other green tea constituents" line covers other amino acids, chlorophyll, flavonoid pigments, trace minerals and lipids — the things that come through a genuine leaf extraction alongside the theanine. That composition is a large part of why the powder is cream to beige rather than the bright white of a purified isolate.
🍃 Source: Extracted From Green Tea Leaf
Theanine reaches the market by three different routes — extraction from tea leaf, bacterial fermentation, or chemical synthesis — and they are not equivalent in law. Production method determines the novel food position in Great Britain, so it is the single most useful thing to know about any theanine product.
This material is extracted from Camellia sinensis green tea leaf. Most bulk theanine on the market is fermentation-derived, because extraction is the considerably more expensive route — tea leaf is only around 1–2% theanine by dry weight, so reaching a 40% grade needs real chromatographic enrichment.
Worth asking any supplier: request the specification sheet and look for the production method. It will say extraction, fermentation or synthesis. If it says nothing at all, that is an answer of a kind.
Full Specification
| Product | Green tea extract standardised to 40% theanine |
| Botanical source | Camellia sinensis — leaf extract, not a purified isolate |
| Theanine assay (HPLC) | 41.3% — specification 40% minimum |
| Appearance | Cream to beige powder |
| Tea polyphenols | 30% minimum |
| EGCG | 3% minimum |
| Caffeine | 2.5% maximum — naturally occurring |
| Other tea constituents | 8.5% — other amino acids, chlorophyll, flavonoid pigments, trace minerals, lipids |
| Loss on drying | 3.4% — specification 6% maximum |
| Residue on ignition | 3.7% — specification 10% maximum |
| Heavy metals | Lead ≤10ppm · Arsenic ≤2ppm · Cadmium ≤1ppm · Mercury ≤0.1ppm — all within limits |
| Microbiological | Aerobic plate count ≤1000 cfu/g · Yeasts & moulds ≤100 cfu/g · Coliforms negative |
| Suitable for | Vegans and vegetarians |
| Packaging | Resealable food-grade foil pouch at every size |
| Storage | Cool, dry, away from moisture and direct light. Reseal after each use |
| Dispatch | 🇬🇧 UK-held stock · same day before 3:30pm Mon–Fri |
Figures are taken from the manufacturer's certificate of analysis for current stock. This is a manufacturer's batch certificate, not independent third-party analysis, and we describe it as such. Certificate available on request.
No Authorised Health Claims — and Why That Is Not the Whole Story
There are no authorised EU/UK health claims for L-theanine. Not one. So this page tells you what the material is and makes no statement about what it does — and any UK seller telling you otherwise is making an unauthorised claim.
Zero authorised claims does not mean zero research. It means nobody has funded and completed an application through the approval process, which is why the register is dominated by vitamins and minerals rather than botanicals.
🧭 FIRST TIME BUYING THIS? THREE THINGS TO KNOW
1. It is not a 98% isolate. Roughly 2.4g of this extract equals 1g of purified theanine. If a listing elsewhere looks cheaper per kilo, check what percentage it assays at before comparing.
2. You need milligram scales. No scoop is supplied. At this concentration a spoon is not accurate enough, and the conversion arithmetic makes guessing worse.
3. It contains caffeine. Up to 2.5%. If that is a problem for you, buy a purified isolate instead — we would rather tell you now than take the order.
Pack Sizes — What Each One Actually Contains
Theanine content calculated at the 41.3% assay. The 500mg column is an arithmetic reference for comparing sizes, not a recommended amount.
| Pack size | Theanine content | 500mg measures |
|---|---|---|
| 50g | 20.65g | 100 |
| 100g | 41.3g | 200 |
| 250g | 103g | 500 |
| 500g | 207g | 1,000 |
| 1kg | 413g | 2,000 |
| 2kg | 826g | 4,000 |
| 5kg TRADE | 2.07kg | 10,000 |
| 10kg TRADE | 4.13kg | 20,000 |
| 25kg TRADE | 10.3kg | 50,000 |
Resealable food-grade foil at every size. 5kg and above are trade quantities — 25kg contains over 10kg of theanine, which is formulation or contract-filling volume rather than personal supply.
How to Use
Work out the powder weight first. Multiply the theanine amount you want by approximately 2.4. Weigh it on digital milligram scales — no scoop is supplied and volume measures are not reliable.
Stir into water or a cold drink. The extract carries a characteristic green tea taste and will tint the liquid.
Reseal the pouch immediately and store cool, dry and away from direct light. Adults 18+ only. Consult your GP before use if pregnant, breastfeeding, taking prescription medication or managing a medical condition.
WHOLESALE · TRADE · BULK · B2B
L-Theanine Extract Wholesale UK · Bulk Supplier Since 2016
Charge Products supplies bulk green tea extract to formulators, encapsulation services, supplement brands, sports nutrition companies and health retailers. UK-held stock, same-day dispatch, no import lead times. Certificate documentation on request. White-label and private-label supply available for qualifying trade buyers.
Three things trade buyers should note
1. Price per gram of theanine, not per gram of powder. At 41.3%, a kilo of this extract contains roughly 413g of theanine. Comparing it against a purified isolate on headline price per kilo will mislead you.
2. Declare it correctly on finished labels. A 500mg capsule of this extract provides approximately 207mg theanine, and it is a green tea extract, not L-theanine. Labelling it as the latter is a false description.
3. Caffeine and EGCG are present. Both need to appear in your own product information. Note that EGCG restrictions applying in Northern Ireland do not currently apply in Great Britain — if you supply into NI, check the position for your finished product.
Wholesale & Trade Enquiries →Where to Buy
Related Products
Why Buy From Charge Products
Big Idea Services Ltd, Companies House No. 11645389. 5 Star Food Hygiene Rating awarded by Southend-on-Sea City Council and verifiable at ratings.food.gov.uk. Every credential stated here can be checked by a third party.
⭐ What Our Customers Say
"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."
Long-term customer · ✓ Verified
"Been ordering from you for years and recommending you — your service, delivery, packaging and product are of high standards."
Returning customer · ✓ Verified
"Ultra fast delivery and good quality product."
Verified UK buyer · ✓ Verified
Frequently Asked Questions
Is this pure L-theanine or a green tea extract?
A green tea extract standardised to 40% theanine, assayed at 41.3% by HPLC. Not a purified isolate. Purified L-theanine is white and crystalline; this is cream to beige because the balance is other green tea leaf constituents. If you need purified 98% material, this is not the right product.
How much theanine is in a gram?
Approximately 413mg. Rule of thumb: multiply the theanine you want by about 2.4 to get the powder weight. 250mg powder gives ~103mg theanine, 500mg gives ~207mg, 750mg gives ~310mg.
Does it contain caffeine?
Yes. Caffeine occurs naturally in green tea and the certificate specifies a maximum of 2.5% — roughly 12mg per 500mg of powder, about 25mg per gram. If you are avoiding caffeine or taking theanine in the evening, that matters, and we would rather you knew before ordering.
What colour is the powder?
Cream to beige. It is not the bright white of a purified isolate — chlorophyll, flavonoid pigments and polyphenols come through the extraction with the theanine. Shade varies between batches because the leaf does.
What else is in it besides theanine?
Tea polyphenols 30% min, EGCG 3% min, caffeine 2.5% max, and 8.5% other constituents including other amino acids, chlorophyll, flavonoid pigments, trace minerals and lipids. Moisture is 3.4% and mineral ash 3.7%.
Is it extracted or fermented?
Extracted from Camellia sinensis green tea leaf. Production method matters because it determines the novel food position in Great Britain. Most bulk theanine is fermentation-derived because extraction is the more expensive route — worth asking any supplier for the specification sheet.
Does it have health benefits?
There are no authorised EU/UK health claims for L-theanine, so we make none and no UK seller lawfully can. We publish the specification instead so you can assess the material rather than the marketing.
Is a scoop included?
No. Digital milligram scales are needed. Powder density varies and volume measures are not a reliable guide to weight, particularly with an extract where the dosing maths already involves a conversion.
Do you offer a subscription or instalments?
Both. Subscribe and save 10% on every order, frequency chosen at checkout, pause or cancel any time. Orders over £50 can be spread across 3 interest-free instalments with Klarna or Shop Pay — subject to status and eligibility, 18+, UK residents.
Which pack size should I start with?
50g or 100g if you are trying the material for the first time — 100g contains about 41g of theanine. 250g and 500g are the usual repeat sizes. 5kg and above are trade quantities: 25kg holds over 10kg of theanine, which is formulation volume rather than personal supply.
What does it taste like and does it dissolve?
It carries a characteristic green tea taste — noticeably more so than a purified isolate, because the tea polyphenols come through with it. It stirs into cold water and will tint the liquid. Some people prefer it in juice or a smoothie for that reason.
How fast do you dispatch, and what does delivery cost?
Same-day dispatch on orders placed before 3:30pm Monday to Friday, from UK-held stock at our own facility in Southend-on-Sea. Free UK delivery on orders over £10. 30-day returns on unopened packs.
Can I fill my own capsules with this?
Yes, and the bulk sizes are bought for exactly that. Remember the conversion when you label them: a 500mg capsule of this extract provides approximately 207mg of theanine, and it must be declared as a green tea extract rather than as L-theanine. Describing it as the latter would be a false description.
Do you supply wholesale?
Yes — bulk and trade supply from UK-held stock, certificate documentation on request, white-label available for qualifying trade buyers. Price per gram of theanine rather than per gram of powder when comparing against a purified isolate. Contact us for trade pricing.
References — regulatory, not efficacy
The references below concern the regulatory status of theanine in Great Britain. We do not cite benefit trials, because on a page for a product with no authorised health claims their only function would be to imply one.
▸ Food Standards Agency — Regulated products and novel foods guidance
▸ Great Britain Nutrition and Health Claims Register — authorised claims list
▸ EU Novel Food Status Catalogue — entry for theanine, distinguishing extraction from other production routes
| Grams |
50 Grams, 100 Grams, 250 Grams, 500 Grams, 1 kilo, 2 kilo, 3 kilo, 5 kilo, 10 kilo, 25 kilo |
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