liz- so funny i looked into it TODAY! i read a ton of professional reviews, not just consumers. I am so into statistics and facts...lol Anyway, I read its only been used on a small study of men... no major public facts are out there. BUT in the small amount...the best of the best got results of up to 40% overall better quality of sperm...and in bigger amounts, to an extent. They said its more important to think about the things you said (no hot tubs, loose fitting undies, etc) and nutrition and exercise are the MOST important. I think that may be my hubby's issue... his eating habits...well, they SUCK. not kidding or exaggerating at all. I have him on a daily multivitamin now... and I am thinking of getting him some fertility supplements! There is my input on that! lol