I have been taking saw palmetto for many years for prostate health. A few years ago, I was at the doctor for a general checkup. He said, "You've got some breast growth here. What are you taking"? I told him saw palmetto for enlarged prostate. He said it had an estrogen like effect, which allowed it to slow prostate growth, and breast growth was one of the side effects. Later, the prostate problem worsened, and they put me on finasteride, brand name Proscar. It clearly lists breast growth on the cautions, as a possible side effect. I've got some nice ones going now, to the extent that I wear loose fitting shirts in guy mode. And the prostate problem is GONE! Proscar works! In more ways than one.