Killitch is a GSL licensed product, proven to prevent and treat the condition known as sweet itch. Killitch contains the active ingredient Benzyl Benozate in a soothing lotion, specially formulated for horses and ponies. Killitch is an excellent lotion to guard against the culicoides midge which causes sweet itch as well as acting as an efficient preventative. Killitch is best used in early spring, prior to symptoms becoming evident which can mean the condition may not take hold.