Green Tea Extract is produced from the leaf of Camellia sinensis, processed without fermentation so that the catechin fraction is preserved intact. Its activity is concentrated in the polyphenols, and within them in epigallocatechin gallate (EGCG), the most studied catechin in the botanical field. NATEXSA offers a grade standardised up to 98% polyphenols and a high-purity grade at 95% EGCG for applications where the active dose has to be reached in a small volume.
Metabolites
Camellia sinensis (L.) Kuntze
Part usedLeaf
Catechins: EGCG, EGC, ECG and EC, within the polyphenol fraction.
Metabolites we quantify
- Total polyphenols98 %UV
- EGCG50 %–95 %HPLC
- Catechins70 %HPLC
Reference doses
Figures published by reference bodies for the preparation named in each row.
| Marker or preparation | Daily dose | Source |
|---|---|---|
| EGCG | No hepatotoxicity was seen below 800 mg/day; at or above that figure, serum transaminases rose | EFSA · Safety of green tea catechins, 2018 |
These are not a NATEXSA dosage recommendation nor a therapeutic indication: they are cited literature, and the preparation the source refers to does not always match the grade we supply. The regulation of the market where you register the product governs.
Applications
Nutrition & Health
Antioxidant supplements, metabolic support formulas and sports nutrition.
Food & Beverage
Functional beverages, infusions and bakery, where it also delays lipid oxidation.
Personal Care
Anti-ageing skincare, scalp care and deodorant formulations.
Polyphenols, catechins and EGCG
The three figures on the specification describe nested fractions: total polyphenols contain the catechins, and the catechins contain EGCG. A "98% polyphenols / 50% EGCG" grade is therefore more concentrated in actives than a plain "70% catechins" — always compare on the same basis.
For claims tied to a specific EGCG dose, work from the HPLC value, not from total polyphenols by UV. NATEXSA reports both on every certificate of analysis.
Stability in the formula
Catechins degrade above pH 6 and accelerate with temperature and dissolved oxygen. In ready-to-drink beverages, keep the pH between 3 and 5 and consider deaeration during filling.
In powder blends the extract is hygroscopic: control the water activity of the mix and use a moisture barrier in the primary packaging.
Packaging
Aluminium bag
1 – 5 kg
Fibre drum with double inner liner
25 kg
- Shelf life
- Shelf life of 24 months sealed, away from light and moisture.
Specification updated:
