Two percentages, two different questions
A green tea extract specification usually shows a catechin figure, often given as a percentage of total catechins or of EGCG (epigallocatechin gallate), and a caffeine figure. They answer different questions. The catechin figure describes the fraction of the extract that is catechins. The caffeine figure describes how much stimulant the powder contains per gram. Two extracts with the same catechin percentage can have very different caffeine levels, so both numbers matter for the formula and for the label.
Our range includes green tea extract. Each lot ships with a certificate of analysis that states the method and the results.
What the EGCG figure means
EGCG is one of the main catechins in green tea, and it is the compound most often quoted. A specification may state a minimum EGCG percentage, or a total catechins percentage with EGCG listed separately. Ask which one is guaranteed, and by which method. An EGCG minimum is a stricter commitment than a total catechins figure, and the two are not comparable.
Also check:
- The method: HPLC is the usual reference for catechin profiling. Ask for the method name, not only the result.
- The batch range: a "minimum 45%" statement should be met by every lot.
- The reference standard: the EGCG figure is only as good as the standard used to calibrate it.
What the caffeine figure means
Caffeine is a natural component of green tea, and extracts can be standardised to a caffeine level or sold as caffeine-reduced grades. If the product is for a formula where stimulant content matters, state the caffeine per dose on the label and in the formula. Do not assume that a catechin-rich extract is low in caffeine: concentration works on both compounds at the same time.
Checklist before you compare offers
1. Confirm the species, Camellia sinensis, and the plant part used. 2. Confirm whether the EGCG figure is a minimum guarantee or a typical value. 3. Confirm the caffeine content per gram and the method used to measure it. 4. Confirm the solvent used in extraction, which affects the residue specification. 5. Ask for the certificate of analysis and the specification sheet before you order a sample.
How the numbers affect the formula
If your label claims a dose of catechins, calculate the dose from the EGCG figure and the batch range, not from the nominal percentage. If your label shows caffeine, use the caffeine figure from the same batch. A capsule made with a 50% grade needs less powder than one made with a 25% grade for the same catechin dose, but it may also carry more caffeine per capsule. Our calculateur de formules estimates the fill per capsule for each format.
Next step
Send us the grade you need, the quantity and the format. We reply with prices and documents within one hour on business days. You can also demander un échantillon and check the extract in your own blend before you order.