AGNUS CASTUS for Horses (Vitex agnus castus) | Hormonal & Pituitary Support

You'll find Agnus castus in MellowMare , where its hormonal character forms part of a broader formula for mares whose seasons show themselves through mood, tension, sensitivity or behaviour.

It also plays an important part in our CushTonic-1 , our nutritional support formula for horses with PPID who are not receiving Prascend. Horses taking Prascend should use CushTonic-2, which is formulated without Agnus castus and our other dopaminergic herbs.

💧Organic agnus castus tincture

Our human-grade, certified organic tinctures capture the plant's naturally occurring constituents in a concentrated, easy-to-feed liquid form.

• Vitex agnus-castus Berry
• Distilled /Decocted 1:3 25%
• Wild harvested
• Feed Guide - 6ml/100kg bodyweight, daily in feed.

🌿Organic agnus castus berry (dried)

Grown, harvested and dried without the use of agri-chemicals, non-irradiated and GMO free - see our Quality page for Quality Management & Certification Documents.

• Vitex agnus-castus , Whole Dried Berry
• Organic Cultivated
• Origin Turkey
• Feed Guide - 5g/100kg bodyweight per day, i.e. 25g for a 500kg horse.

Footnotes

• Laboratory tested for identification and compliance to the British and European Pharmacopoeia standards.
• Human grade.
• Please be aware that if you're purchasing our dried botanicals for human use, our dried range is cut to appropriate sizes for feeding to horses.
• ♻️ Eco Note: Our packaging is recyclable and refillable.
• 🧊 Storage Tip: Keep cool and dry.

If you want the science, ‘energetic architecture’ explains how a herb is designed to work within the body - not just what’s in it, but the particular tissues and functions it has an affinity with.

Agnus castus is a gently regulating herb with a particular affinity for the pituitary gland and dopamine-responsive endocrine pathways.

1. Supporting dopamine signalling - Compounds within Agnus castus have demonstrated dopaminergic activity, including interaction with dopamine receptors. That helps explain the herb's longstanding interest in pituitary function, where dopamine plays an important regulatory role.
2. Encouraging steadier hormonal rhythms - Through its relationship with dopamine-responsive pituitary signalling, Agnus castus may help support the communication involved in reproductive cycles and seasonal endocrine patterns. It doesn’t provide oestrogen or progesterone - it supports the body’s own hormonal regulation.
3. Supporting behaviour through endocrine balance - Agnus castus isn't a sedative; where behaviour changes alongside hormonal or seasonal patterns, its role is better understood through endocrine support than direct nervous-system calming.

Big picture

Agnus castus doesn’t take over hormone production or tell one particular hormone what to do. Its affinity lies higher up the chain, where dopamine and pituitary signalling help organise the wider pattern.

It works at the control desk, not by adding more hormones to the conversation.

• PPID and Prascend (pergolide) – avoid Agnus castus alongside Prascend unless specifically advised by your vet. Both act on dopamine-related pathways, so we keep the two support routes deliberately separate. For horses receiving Prascend, see CushTonic-2.
• Pregnant or nursing mares – check with your vet before feeding Agnus castus during pregnancy or lactation.

Agnus castus has collected some memorable names over the centuries: chaste tree , chasteberry and, perhaps most intriguing of all, monk’s pepper. You can probably see where this is heading.

According to historical accounts, the berries were added to monks’ food to help keep their thoughts on prayer rather than more earthly distractions. Whether they achieved the desired result is another question, but the reputation certainly stuck. By 1790, the botanical writer William Woodville was recording the story behind the name.

Its place in herbal history reaches back much further than the monastery kitchen. Dioscorides wrote about Agnus castus in the first century AD, and its association with chastity was already part of its ancient identity. This little berry had acquired quite a reputation long before anyone could investigate its chemistry.

There was a practical kitchen chapter too. The fruits were used as a pepper substitute from antiquity - so “monk’s pepper” wasn’t simply an imaginative nickname. A seasoning with rather more attached to it than flavour.

What I like about this story is how much history survives in a plant’s everyday names. Chasteberry gives us an old belief; monk’s pepper brings the monastery kitchen into view - but neither tells us everything about the herb, yet both offer a glimpse of the people who used it.

Here at EquiNatural, its place is in hormonal and endocrine support. The monks would probably have found the modern pituitary conversation a bit bewildering!

One little berry, a very long backstory - and a lot expected of it at dinner.

How do I know if Agnus castus is the right herb for my horse?

We'd look at Agnus castus when the picture seems hormonal or endocrine rather than simply nervous or behavioural.

Perhaps a mare changes noticeably around her seasons, or an older horse is showing signs that have you thinking about pituitary and endocrine function.

Agnus castus works higher up the hormonal conversation, supporting dopamine-responsive pituitary signalling and the body's own endocrine rhythms.

So think regulation rather than sedation.

Is Agnus castus just for mares?

Not at all. Its long association with reproductive hormones means mares tend to get most of the attention, but Agnus castus has an affinity with the pituitary and dopamine pathways, rather than being a “female hormone” herb.

That's also why it has a long history of use in older horses where PPID is part of the picture.

What's the difference between Agnus castus and MellowMare?

Agnus castus is a single herb for straightforward hormonal and pituitary support.

MellowMare is our broader mare formula for horses whose seasons show themselves through mood, tension, sensitivity or behaviour, bringing together herbs that support both hormonal balance and the way the mare feels and responds.

So if Agnus castus fits the job, keep it simple. If the whole mare seems to arrive with her hormones, MellowMare brings in the team. 😉

Can I feed Agnus castus to a horse with PPID?

Agnus castus has a long-standing place in nutritional support for horses with PPID because of its relationship with dopamine-responsive pituitary pathways.

But there's one particularly important distinction - i f your horse is taking Prascend (pergolide), don't feed Agnus castus alongside it.

For horses receiving Prascend, our CushTonic-2 is specifically formulated without the dopaminergic herbs we avoid alongside the medication.