What's green tea Green tea leaf extract is derived from exactly the same plant as black tea (Camellia Sinensis). It varies, however, in how the leaves are ready and fermented, providing benefits not seen in black tea. Portions of the active compounds are destroyed in tea which is black, but be active in the green variety. These active constituents possess a big impact on excess fat, accelerating each loss of stored fat and also bringing down fat storage itself.