Camellia sinensis
Green Tea Extract
Catechins plus caffeine, and the first of two caffeine sources here.
Evidence grade: Well studied, at doses larger than this.
What It Is
Green tea extract concentrates the catechins found in Camellia sinensis leaves, chiefly epigallocatechin gallate, usually shortened to EGCG. It also carries caffeine, which is the part of this ingredient most likely to be noticeable.
It is among the most studied botanicals in existence, which is a genuine advantage and also a reason to read the dose column carefully before assuming those studies apply here.
What It Is Doing Here
Three points, written without the marketing vocabulary.
Caffeine, first and most noticeable
Caffeine raises alertness and slightly raises energy expenditure. Some of what people describe as an energy effect from this product is simply this, which is worth knowing rather than misattributing.
Catechins, more slowly
EGCG is studied for effects on fat oxidation and on how the body handles glucose. The research is real and the effect sizes in humans are modest.
Dose is the whole question
Most catechin research uses several hundred milligrams of EGCG a day. A blend share cannot approach that, and no honest page should imply otherwise.
The Dose Question
Green tea extract is also where the safety literature in this category is most developed, and it is worth knowing why: concentrated extracts at high doses have been associated with rare liver injury, particularly when taken fasted.
The amounts implicated are far above anything a small blend delivers, and taking the dose before a meal rather than on a completely empty stomach is a sensible habit regardless.
Where Else You Would Meet It
| Source | Typical amount | Notes |
|---|---|---|
| Brewed green tea | 1 cup | Roughly 50 to 100 mg catechins, 25 to 45 mg caffeine |
| Matcha | 1 serving | Higher again, because the leaf is consumed |
| Standardised extract | Research format | Often 45 to 90 percent EGCG |
| Bottled green tea drinks | Highly variable | Frequently far less than brewed |
| Decaffeinated extract | Exists | Catechins retained, caffeine mostly removed |
| This product | Blend component | Amount not individually declared |
Cautions Worth Knowing
The practical caution here is caffeine rather than catechins, and it compounds with the guarana further down the same blend. If you are caffeine sensitive, pregnant, managing anxiety or living with a heart rhythm condition, treat the undeclared total with respect and keep the dose to the morning.
Green tea can also reduce the absorption of iron from plant foods, which matters more for people who already run low.
Further reading: the licorice ceiling and what sublingual actually does. General information about a nutritional ingredient, not medical advice. See the health notice.
Green Tea Extract Questions
What we are asked about this line of the label specifically.
How much caffeine is in this?
The label does not say, because green tea extract and guarana both sit inside an undeclared blend. That is a real limitation and the reason for the morning-only instruction.
Is green tea extract hard on the liver?
Rare cases of liver injury have been reported with high-dose concentrated extracts, usually taken fasted. The amounts involved are far above a small blend share.
Would drinking tea do the same thing?
For catechins, a few cups a day is a reasonable comparison and it is cheaper. The difference is convenience rather than potency at this blend size.
Can I have coffee as well?
Yes, but count it. Two caffeine sources in the bottle plus a morning coffee adds up faster than most people expect.