Chasteberry is an herbal supplement that is used to support mood balance and hormone health in female and male horses.
The Chastetree berry (Vitex agnus-castus) plant is a shrub that grows in the Mediterranean and parts of Asia. The fruits and leaves contain active ingredients that influence hormonal balance in horses.
This herb is purported to support hypothalamus and pituitary function in horses with Cushing’s disease/PPID. Anecdotally, chasteberry is said to help make moody mares easier to handle and may have a calming effect on aggressive stallions or geldings.
Chasteberry is safe to use, with no reported side effects in horses. It is not recommended for pregnant mares because of potential effects on the reproductive system which have not been evaluated in pregnant animals. 
This podcast reviews the benefits of chasteberry for horses and highlights its mechanism of action.
Read more: https://madbarn.ca/chasteberry-benefits-for-horses/
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