Chaste Tree Berry, also known as Agnus Castus, is a traditional herbal supplement used to support hormonal balance and overall well-being in horses. Particularly beneficial for older horses, moody mares, and riggy geldings, it may help maintain healthy pituitary function and is often used as part of a supportive routine for horses showing signs of Cushing's or seasonal behavioural changes. Known for promoting a calm, focused temperament without sedation, it can help manage hormonal-related mood swings and stress. Regular use may also contribute to stable energy levels and improved coat condition, making it a valuable addition to the daily diet.