A horse litter conditioner specially formulated from a combination of highly absorbent mineral and vegetal compounds and essential oils, to provide an effective sanitation of stables and box-stall environments. It absorbs fluids and moisture from litters, hinders conversion of urine to ammonia gases, reduces fermentation, heat release and development of unpleasant and irritating odours. In contact with moisture it releases and liberates volatile essential oils reputed for their insect repelling and air sanitation properties.