NAF 5 Star Oestress provides nutritional support of the hormonal imbalances in mares. Hormonal imbalances can cause mood swings, hypersensitivity & poor performance. NAF 5 Star Oestress contains natural ingredients specifically chosen to help prevent marish behavior. These include a range of natural materials providing anti-oxidants: glutathione, vitamins & minerals, carotenoids, bioflavanoids & trace elements chosen to support hormone regulation.