Tuffrock G.I. Liquid is a new approach for horses designed to focus on the cause, not the symptoms. The concept is we may be able to help maintain normal gastro-intestinal conditions as if your horse is free on the range. Tuffrock G.I. is manufactured from our unique range of 100% Australian natural colloidal volcanic minerals with gut acid normaliser and gut toxin binder. Lovely earthy taste means easy to paste by syringe over the tongue or add to feed.