A novel dietary supplement and nutritional aid and methods for the manufacture and administration of the same are disclosed for the efficacious treatment and/or prevention of digestive tract ulcers in horses and other animals. The dietary supplement of the present invention is effective in treating and/or preventing gastric ulcers, and in treating colonic ulcers as well. The dietary supplement of the present invention consists of safe and natural ingredients rather than drugs, and is orally administrable. The ingredients of the dietary supplement of the present invention when combined provide a synergistic efficacy which greatly exceeds the sum of the efficacies of the individual ingredients, making the dietary supplement highly effective in the treatment of digestive tract ulcers.