fertility vitamins ???

Has anyone had any luck in taking fertility supplements when TTC ?? A friend of a friend of mine has been trying to get pregnant for the last 2 years. she had gone to see a specialist and they told her she had some fertility issues and most likely she would have to try IVF to get pregnant. She is not my friend so I don't know all the details but today I heard she is expecting. My friend told me that her and her fiancé had both been taking fertility supplements that they sell in the vitamin shops and after 3 months of taking these pills and trying she is finally pregnant. Any thoughts on this or has anyone tried supplements to help boost fertility?