"SPERM-UP is our proprietary blend of  Bulgarian Tribulus Terrestrius concentrate, vitamins, chelated minerals and tasty meat powders and fats. Tribulus is a research proven spermatogenic agent and the beneficial effects of this product are well documented amongst dog breeders. Now your stud dog can produce good litters well beyond the time that most dogs must be retired. Contact us for testimonials! Sperm-Up comes in a one pound vacuum sealed bag for complete freshness."