Both my mares are on Mare Magic, AWESOME stuff, I honestly did not believe it would work, one of mares flat out would not let you catch her when she was in heat, I would spend an hour chasing her all over our pasture when she was in heat and it got so bad I would have to keep her in a stall during her heat cycle if I wanted to ride her. I put her on Mare magic and now you never even know when she is in heat. I loved it so much I put my other mare on it too and a gelding as well and it keeps him from being so nervous at runs. I swear by this stuff and it is cheap too!!!