Animal Health Company Hormonise is b ased on liquid Chaste Berry, which has traditionally been used to help irritable mares at the time of their seasons, to maintain the hormonal imbalance. Can also be used on rigs when there is unwanted sexual behaviour and aggression. Do not feed to mares in foal. Feeding Guidelines Horses and ponies: use up to 40ml over feed for approximately 3 weeks and rest for 1 week. Continue as necessary. What's in it Chaste Berry extract, Water. Propionic Acid E280, Acetic Acid E260 (as preservatives). Ascorbic Acid E300 (as antioxidant). Size Guide Available in 1 Litre or 2.5 Litres.