Supplements for male fertility

Has anyone had success with male fertility supplements and/or eating certain foods to increase sperm count and motility?
If so, what did your SO take and where did you purchase it if a supplement? Any other tips for low sperm count solutions are much appreciated! 
My DH had a sperm analysis done and was told he has very low count and low motility. Double whammy! He is really down in the dumps about it.  I know we could use donor sperm or adopt but we are hoping to try whatever we can to improve his fertility before we go that route.