Bug Check Reduce Fly Supplement For Horse Product Form: Solid Product Type: Reduce Fly Supplement Animal Type: Horse Container Size: 2 lb. Supplement Function: Flying Pests Recommended Animal Age: All Supplement Contents: Probiotics An oral chemical-free feed supplement to reduce fly problems and enhance coat Repellency is created from the inside out with use of brewers yeast thiamine monohydrate and garlic With diatomaceous earth that passes through the manure it naturally interrupts the fly reproduction cycle For horses cattle sheep and goats. Discovery ACC