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Chastetree Berry

To support normal hormone levels and responses

26 reviews. 4.8 / 5
Judith - 15/08/2022 09:40
My mare has been much more settled.
Hazel - 19/05/2022 08:03
Horses seem to like it , too early to see a difference, will continue for at least 3 month to see if it makes a difference x
Debra - 31/01/2022 11:24
Have used this product before to help my 43 year old pony with his cushings. Along with the conventional veterinary treatment. I believe it helps keep it under control.. it comes in a fine palpable powder which he is happy to eat in his wet feed.
Alyson - 18/11/2021 10:57
Not certain if this is helping but worth a try as she is very mareish at moments
Trusted Feefo Customer - 30/09/2021 16:41
just received so will be able to answer in a few weeks.but was recommended by a friend whose horse is off normal medication now and just has the chastetree berry supplement
Hilary - 19/08/2021 08:12
Works great on my Welsh cob
Trusted Feefo Customer - 12/08/2021 19:44
Caught Cushings early and this supplement is amazing and we have a normal reading again.
Trusted Feefo Customer - 19/04/2021 08:03
Have used this on my mare for two months and its doing its job
Hilary - 22/02/2021 11:14
I haven't been using it for too long but so far so good, would prefer to review after a few more weeks
Morag - 15/01/2021 09:39
Have an older mare showing signs of cushings and this product has helped her no end.

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Feeding Guide

Weight of Horse/Pony Amount per day                                  
Up to 400kg ⅓ scoop
Over 400kg ¾ scoop


1 level (50ml) scoop of Chastetree Berry weighs approximately 27g

Unsuitable for pregnant mares due to the hormonal action of this herb.
If wanting to feed to pregnant or lactating mares seek veterinary advice prior to adding to the diet.

Feed supplements should be fed according to body weight. Introduce to the horse's diet gradually, splitting between feeds (when applicable).

Chastetree Berry is a complementary feeding stuff for equine animals. Feedmark uses nothing in the formulation of this product that contravenes competition rules..

Nutrition Information

Chastetree Berry (Agnus-Castus) is also known as Monk’s Pepper and was first recorded as being used by Hippocrates in the 4th century AD.  Chastetree Berries have long been fed to horses and ponies to support hormonal challenges, and to older horses that require pituitary support.


Chastetree Berry powder (Agnus castus), Calcium carbonate (for product consistency)


Crude protein 2.2%
Crude oils & fats 1.5%
Crude fibre 24.9%
Crude ash 51.8%
Sodium <0.1%

I have a very hormonal mare, would this stop her coming into season?

Chastetree Berry won’t stop your mare coming into season, but it can help to maintain more stable hormone levels through oestrus, which will keep behaviour more settled. For the best support for hormonal mares we recommend that you look at Hormonease.


My gelding is riggy, and at times his behaviour is very stallion like, is this only used for mares, or can it help geldings too?

Chastetree Berry can help to maintain normal hormone responses, and can be fed to riggy geldings as well as hormonal mares. It is included as an ingredient in Feedmark Hormonease.


My pony struggles to shed his winter coat, I was told this supplement could help?

For older horses and ponies that may struggle with coat loss, this herb can help to maintain normal shedding patterns. If you have a horse or pony that has been diagnosed with Cushing's you may be interested in C-Plus™.