Manna Pro Jump Start PlusManna Pro(R) Jump Start Plus There are a few vitamins and minerals that the horse's body cannot produce, thus there is a need to supplement these nutrients. Manna Pro(R) Jump Start Plus, is one such supplement that provides horses with natural microorganisms, minerals and vitamins that can be lacking. It also contributes in improving the horse's appetite under stressful situations and aids in digestion of nutrients for maximum feed efficiency.