[Dynseli]

Green-tea may be counterproductive because of its caffeine effects, other than that it upregulates ER-alpha, and lowers DHT. If green-tea upregulates ER-alpha, that could imply it antagonizes (works against) it. Many hormones that increase sensitivity also decrease growth. Hormones that cause growth also decrease sensitivity, this has potential for cycling another phytohormone that causes growth. Being able to cycle 3 hormone types is better than being able to cycle just 2.

Either caffeine or green tea being an ER-alpha antagonist could explain why green tea is used for herbal reduction.