High-performing animals are constantly exposed to various stressors. Heat stress, mycotoxins intoxications, metabolic stress or impaired immune functions are common worldwide. All these stressors lead to so called oxidative stress, which is characterized by an excess of free radicals. Natural polyphenols help to hold a balance between oxidative and antioxidative processes. Due to its very high antioxidative potential MiaPhenol protects animals in phases of oxidative stress.