This site describes Green Tea Extract as rich in catechins studied for a potential role in fat oxidation and energy expenditure.
"Potential role" and "studied for" are cautious phrases. The claim is about a research interest in catechins, not a demonstrated effect of this specific dropper.
The page cites no dedicated source for green tea, and no amount is published. Existing blog guides cover Apple Cider Vinegar and Berberine; green tea and cayenne are the two this series fills in.