Natural Sperm Boosters?

Okay, because my SO has a low sperm count/low motility and I have endometriosis, our fertility Dr. has told us that we will not be able to get pregnant without fertility treatment, but because they're so expensive, I've been researching alternate routes online. I've read many articles suggesting that supplement/vitamins such as L-Arganine, L-Carnitine, Ginseng, Maca Root etc. may help boost sperm volume and help with motility. Has anyone else looked into or even tried some of these? Any luck?