Tuffrock GI (Gastro-Intestinal) Liquid is a world first super-energised colloidal volcanic mineral blend, with bioavailable collagen. Also contains toxin binders, and pH and acid stablisers for GI (Gastro-Intestinal) health. * Naturally works in the prevention of stress stomach ulcers. * Relieves gut stress with alkaline action to quickly normalize gut acid. * Acetic acid stabilizer to assist with stress colic, gently expels unwanted protein, bacteria or toxins within manure to help cool horses. * Collagen helps strengthen stomach linings.