Chrysin Extra Strength from SciFit:

Natural Isoflavone Combats Estrogen!

Chrysin has been shown in scientific studies to have dramatic anti-estrogenic effects decreasing estrogen production in some subjects as much as 92%.

Scientific studies show that flavones (primarily chrysin) may exert a wide variety of powerful effects. Specifically, studies done in Europe show that after supplementing
with chrysin blood serum levels of testosterone went up a whopping 30%! How does this work? There are two major hormones in both guys and gals: testosterone and
estrogen. Testosterone is dominant in guys and estrogen is dominant in gals--duh! But interestingly, estrogen seems to be a signal to the pituitary gland in the brain.
Based on estrogen levels, the pituitary turns on or off testosterone production. The higher the estrogen levels, the lower the amounts of testosterone will be produced.
This is where chrysin comes in! Chrysin basically reduces estrogen levels by cutting down on its conversion from testosterone.

Chrysin should be taken for a two week cycle at 2-3 capsules per day with the third week off.