Natural fertility Rx. There are certain herbs like chase tree berry extract that enhance fertility, and considered natural. Chinese herbalists have used dong quai to balance female hormones for centuries. Many cultures have developed their own natural fertility enhancing treatments such as warm massage used in the middle east. I don't know any double blinded studies, but many cultures have developed their own methods.
There are none. No well designed study has demonstrated any benefit form natural/herbal treatments when it come to infertilty.