According to About.com, saw palmetto is not dangerous for most women, but the safety of pregnant or nursing women taking this herb is not established. It is also not known how this herb affects people with liver or kidney disease.
About.com says that saw palmetto is usually used in the treatment of conditions such as benign prostatic hyperplasia. However, some studies suggest that saw palmetto is used to help fight hair loss due to male-pattern baldness. Saw palmetto is also known to interact with sex hormone levels. As a result, some doctors recommend that women with breast cancer or a history of breast cancer in their families avoid taking saw palmetto. In addition, this herb is known to cause erectile dysfunction in men.