(Med-Vet Pharmaceuticals) Flies-A-Way is an all-natural supplement to help repel biting insects and help reduce fly populations. Contains garlic, brewers yeast, and apple cider vinegar, plus diatomaceous earth, a natural element that's been used for hundreds of years to help control insects. When fed, diatomaceous earth passes through the horse's system into the manure where insects come into contact with it. Diatomaceous earth draws lipids from the insect's exoskeleton causing dehydration and death, thereby preventing fly larvae from hatching into a future generation of flies. For best results, feed Flies-A-Way to all horses on your property. Begin feeding 2 – 3 weeks prior to start of fly season. Feed 30 grams daily. Pellets.