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 hypothalamic and pituitary function in horses. 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 not recommended for pregnant and lactating mares or growing horses because of potential effects on the reproductive system which have not been evaluated in these animals. [2]

Mad Barn’s Chasteberry Powder is made of pure dried chastetree berry fruit without any additional ingredients. It should be fed at a rate of 5-20 grams per day, increasing the serving size slowly to limit avoidance.