Chastetree Berry for Horses

Vitex agnus-castus, aka Chastetree, Monk’s Pepper, is a small tree native to the  Mediterranean that produces lilac colored flowers on long stalks which fruit large round berries.

Vitex was mentioned many times in the writings of the ancient Greeks and Romans.  It was also known to 13th century Europe.  The tree grows well in both temperate and subtropical zones.

CTB – Chastetree berries, or simply Chasteberry – have a long traditional history of use to help balance hormonal systems, both male and female. While males and females have different levels of hormones produced by the sex organs, the activity of those organs is influenced by the same pituitary hormones, namely LH and FSH.

Recent research into the actions of CTB extract has shown it supports the activity of dopamine.  Since dopamine regulates LH and FSH secretion, this is believed to be how the plant works.  Dopamine also regulates the secretion of prolactin and hormones from the PPI, the intermediate lobe of the pituitary, i.e. the POMC derived hormones beta-endorphin, alpha-melanocyte stimulating hormone and ACTH.

CTB extract functions as an adaptogen in these hormone systems. Adaptogens are substances that assist in stabilizing physiology and promoting homeostasis.  Homeostasis is a state of equilibrium in which the organism functions optimally.

CTB extract has been well studied for human use and is listed by the German Commission E, a body which provides scientific background on the use of traditional herbal substances.

In horses, CTB extract has the potential to assist the body in maintaining homeostasis in a wide range of situations, including:

  • Ovarian function and female hormone production
  • Lactation
  • Female behavior
  • Male hormone production
  • Male behavior
  • Shedding (under the control of prolactin)
  • Intermediate pituitary lobe hormone production

Vitex agnus-castus is an excellent example of scientific study validating and explaining traditional herbal uses.

Eleanor Kellon, VMD

About Dr. Kellon

Graduate of University of Pennsylvania Veterinary School. Owner of Equine Nutritional Solutions,, industry and private nutritional consultations, online nutritional courses. Staff Veterinary Expert at Uckele Health and Nutrition.
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4 Responses to Chastetree Berry for Horses

  1. M Brandt says:

    I have my PPID and IR mare on CTB supplement for 2 years. She is 33. Can I use pergolide as well?

  2. Dr. Kellon says:

    It can help with symptoms, especially shedding, but is not reliable for lowering ACTH levels and eventually loses effectiveness. It has been used along with pergolide to improve shedding.

  3. Billy Blackman says:

    Does chasteberry help horses with PPID? What about when given along wit Pergolide?

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