Agnus Castus for Horses: A Natural Way to Support Hormonal Balance

Many horse owners start looking for herbal support when their horse begins showing signs of hormonal imbalance. One herb that is widely used in equine nutrition is agnus castus, also known as chaste tree berry.

Traditionally used in herbal medicine for centuries, agnus castus is valued for its ability to support the hormonal system, particularly the pituitary gland. When used correctly as part of a balanced feeding programme, it can be a helpful addition to supporting your horse’s overall wellbeing.

What is Agnus Castus?

Agnus castus comes from the berries of the chaste tree. These berries are dried and used in herbal preparations as powders, granules, or blended into herbal supplements for horses.

In equine nutrition, agnus castus is most commonly used to support the pituitary gland, which plays a key role in regulating hormones within the body.

Because hormones influence many functions — including metabolism, coat condition, behaviour, and energy levels — supporting this gland can make a noticeable difference for some horses.

Supporting Horses with Cushing’s (PPID)

One of the most common reasons horse owners look at feeding agnus castus is to support horses diagnosed with Pituitary Pars Intermedia Dysfunction, often referred to as Equine Cushing’s disease.

This condition affects the pituitary gland and is most often seen in older horses.

Signs can include:

• A long or curly coat that does not shed properly

• Muscle loss along the topline

• Increased drinking and urination

• Reduced energy levels

• A higher risk of laminitis

While agnus castus is not a replacement for veterinary treatment, it is often used as a supportive herb to help maintain hormonal balance and overall wellbeing.

Hormonal Behaviour in Mares and Geldings

Hormones can also influence behaviour.

Some mares become noticeably moody or uncomfortable during their seasons, while some geldings can show stallion-like behaviour or heightened reactivity.

In these situations, horse owners sometimes choose agnus castus as part of a management approach aimed at supporting more balanced hormonal function.

Many people report improvements in:

• Seasonal mood changes in mares

• Irritability or tension

• Difficulty focusing during work

• Hormonal-type behaviour

  
  

Supporting Older Horses

As horses age, the endocrine system can become less efficient. This can affect:

• Coat condition

• Energy levels

• Weight maintenance

• Muscle tone

Because agnus castus supports the pituitary gland, it is often included in herbal blends designed for senior horses.

Feeding Agnus Castus to Horses

Agnus castus can be fed on its own or as part of a herbal blend.

When introducing any herb, it is best to:

• Introduce gradually

• Feed consistently

• Monitor changes in behaviour or condition

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It is always advisable to speak to your vet if your horse has a diagnosed condition or is receiving medication.

Supporting Hormonal Health Naturally

Herbal support works best when it forms part of a complete management approach. Supporting your horse’s health should always include:

• Good quality forage

• A balanced vitamin and mineral intake

• A good routine,

• Routine veterinary care

  
  

When these foundations are in place, herbs such as agnus castus can play a useful role in supporting hormonal balance and overall wellbeing.

Herbal Support.

If you are looking for a convenient way to include supportive herbs in your horse’s diet, herbal blends can provide a balanced approach.

Our Happy Mare mix from Equus Health contains carefully selected herbs designed to support hormonal balance and comfort in mares.

You can learn more about the blend here:Equus Health Happy Mare Mix

It can be used alongside good feeding and management practices to support mares who may benefit from additional hormonal support.