Global Herbs Flyfree provides a traditional, unique and powerful way to help horses tolerate flies, while also quickly soothing affected skin that may be itchy or uncomfortable. The plants in fly free are digested and pass through to the skin where they make things much more comfortable for your horse. Gone are the days when all the choice you have is to use sprays and nasty chemicals. Such products can be quite toxic and in the long term dangerous to perfect health and skin condition