Purina Land O Lakes® HST Water SupplementLand O Lakes HST Water Supplement is uniquely designed for young animals to proactively support hydration and gut health, keeping animals performing their best in high stress situations including heat stress, transportation stress, and show or housing changes. HST contains Fulfill Prebiotic, Fructooligosaccharides (FOS) prebiotic and saccharin, alongwith magnesium, vitamin C and B vitamins to support gut health, stress management, tissue health and