Check out their website at www.realworldwildlifeproducts.com !  EHD (Expect Healthy Deer) has been lab tested and shown to prevent and even cure Epizootic Hemorrhagic Disease in captive deer pens. It is offered as a mineral, feed supplement, and feed additive. In Texas Lyssy and Eckel deer feed can add it to your next order. 

Real World Wildlife Products also offer several food plot seed blends.  Check them out, these guys are legit!