The invention features the use of a composition that includes (i) anoligomericmaterial formed by reaction of 6 to 8 molar equivalents of oxygen with acarotenoidand (ii) a comestible material for increasing the activity level of an animalin needthereof. The invention also features a composition that includes (i) anoligomericmaterial formed by reaction of 6 to 8 molar equivalents of oxygen with acarotenoidand (ii) a comestible material for increasing the activity level of an animalin needthereof.