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Ultimate Gastro-Ease®

Complete support for equine gastrointestinal comfort.

637 reviews. 4.9 / 5
  • Reviews
  • Technical
  • Feeding Guide
  • FAQs
Guest - 07/04/2026 15:14
I have been using this product since December.
My horse was stressed which was causing bad behaviour, especially when being girthed up to ride.
It has made a massive difference already so I’ll be continuing to use it.
Angela - 06/04/2026 19:44
Good product, would recommend for those who have horses that have had ulcers. My horse loves the taste and eats it no problem
Lesley - 06/04/2026 19:34
Since using the product all three horses more settled and happy.  Dare not stop using now
Guest - 05/04/2026 11:31
Easy to order, and perfect delivery
Sarah - 01/04/2026 12:11
I have had my horse on Ultimate Gastro Ease since he finished Ulcer treatment over 2 years ago .   He has not shown any signs of Gastric Ulcers in that time which I attribute to this product .
Linsey - 01/04/2026 07:30
My horse has been on this supplement for 2 months now.  I put her on it as she was starting to show signs of loose poo, and was angsty when being groom round her belly and stifle areas.  Since she has been on this, her behaviour has improved.  Due to its nature of supporting the whole digestive system, it also seemed to make sense to provide this extra support before we start turn out this year.

The product appears to be palatable and there has been definite improvements in the areas stated above.
Anne - 31/03/2026 07:35
Have used this product since my horse was diagnosed with ulcers. Works well keeping her calm .
Hilary - 30/03/2026 11:53
Another great product from Feedmark! Ultimate Gastro Ease has been a regular supplement for our competition horses for several years now. It keeps their tummies comfortable and in turn they are calm and content!
Sophie - 27/03/2026 18:46
Ordered this years ago for my young mare who had colic surgery and they recommended going on gastro. It’s done wonders with keeping her stomach level as she’s quite a stressie horse. Then I asked about my other mare who could possibly have hind gut owners we I need pre and probiotics and they recommended this, so I was very happy knowing I can have both my horses on this and it does the job!
Alexandra - 26/03/2026 19:20
Used this for my young horse that has had ulcers in the past, seen some improvement and he was happy to eat it as it smells lovely

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Nutrition Information

Ensuring digestive comfort is important to allow our horses to thrive and perform to the best of their ability. Ultimate Gastro-Ease® is a unique blend of ingredients that supports comfortable and efficient digestion by providing complete support from the stomach to the hindgut.  

The mineral salts Calcium carbonate, Dicalcium phosphate, Magnesium hydroxide, and Magnesium carbonate, contribute to maintaining a healthy gastric environment and help support the mucosal lining of the stomach and small intestine.  

Lecithin is highly hydrophobic (water hating), while Pectin forms a gel-like substance that binds to bile acids when exposed to an acidic environment. When combined, Lecithin and Pectin support the natural protective mucosa of the stomach, which is known to become irritated by high-concentrate diets, medications, and stress.

Support for the sensitive microbial population in the hindgut is provided by the unique combination of pre-, pro- and postbiotics in Ultimate Gastro-Ease®:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Prebiotics:

The prebiotics (Fructooligosaccharide (FOS) and Mannan oligosaccharide (MOS)) provide food sources for beneficial bacteria that are responsible for fermenting fibrous foodstuffs the horse eats.  

 

Probiotics:

The probiotic YeaSacc® provides the horse with a supply of live yeast (Saccharomyces cerevisiae) which is an important component of the microbial population, and which stimulates the activity of bacteria within the hindgut, optimising fibre fermentation. This probiotic also maintains activity of bacteria that break down lactate which helps to support the hindgut.  

 

Postbiotics :

Postbiotics are non-living microorganisms and their byproducts, that can support your horse’s gut health. In Ultimate Gastro-Ease®, the postbiotics contain beneficial cell components and metabolites. These work to promote a healthy balance of bacteria in the horse’s gut, supporting overall digestive health.

Postbiotics have been shown to increase volatile fatty acid production in horses, which enhances fibre fermentation, particularly for high-fibre forages. This makes Ultimate Gastro-Ease® particularly beneficial for horses and ponies fed low calorie, high fibre diets and for metabolic or weight management reasons. 

Bacteria species within the hindgut are also more consistent in horses fed the postbiotic compared to those fed a control diet, making it beneficial for keeping the hindgut stable and maintaining digestive comfort. 

 

Further supporting immunity in Ultimate Gastro-Ease® are Kaolin and specialised beta glucans which bind to pathogens, helping to keep the gut healthy. The amino acid Glutamine also provides an energy source to immune cells ensuring optimal function. 

With an aromatic and settling mint aroma, Ultimate Gastro-Ease® provides a highly palatable unique combination of ingredients suitable for all horses and ponies with additional digestive, gastric and hindgut needs. 

 

 

Composition

Yeast products (supplying postbiotics), Fructo-oligosaccharide (FOS), Magnesium hydroxide (10%), Yeast products (supplying Mannan-oligosaccharide and Beta glucans), Alfalfa meal, Calcium carbonate, Dicalcium phosphate, Magnesium carbonate (4%), Molasses, Hydrolysed wheat glutamine peptides, Pectin (2%)

Additives

 

Additive number 

per kg

Binder 

 

 

Kaolinic clay

E559

43g

 

 

 

Antioxidants 

 

 

Soy lecithin

1c322i

17g

 

 

 

Flavouring

 

 

Peppermint oil

 

1g

 

 

 

Digestive enhancers 

 

 

Yea-Sacc® live yeast (4a1704 Saccharomyces cerevisiae CBS 493.94)

21,350,000,000cfu

 

Analytical

Crude protein 8.1%
Crude oils & fats 3.2%
Crude fibre 4.7%
Crude ash 34.1%
Acid insoluble ash       2.4%
Sodium 0.1%
Calcium 5.1%

 

Feeding Guide

 
Weight of Horse/Pony           Amount per day
Up to 250kg 1 ½ scoops 
250kg - 400kg 2 ½ scoops 
400kg - 600kg 3 ½ scoops 
Over 600kg  4 ½ scoops
 
1 level (50ml) scoop of Ultimate Gastro-Ease® weighs approximately 36g
 

Ultimate Gastro-Ease® should be added immediately prior to feeding, keeping the supplement as dry as possible, otherwise effectiveness may be lost.

Avoid feeding large concentrate meals (pellets, mixes and grains). Instead feed little and often throughout the day, especially concentrate feeds. Always feed at least 1.5% of your horse's body weight per day as fibrous forage (for a 500kg horse feed at least 7.5kg of fibre per day). Horses showing signs of excess acid should have continuous access to forage.


Ultimate Gastro-Ease® is a complementary feeding stuff for equine animals. Feed supplements should be fed according to body weight. Introduce to the horse’s diet gradually, splitting between feeds (when applicable). Feedmark uses nothing in the formulation of this product that contravenes competition rules.

Shake periodically to avoid settling.

How does Ultimate Gastro-Ease® support my horse’s entire digestive tract?

Ultimate Gastro-Ease® supports the horse’s entire digestive tract by combining a unique blend of ingredients that support the stomach, small intestine, and the hindgut:

Stomach and small intestine: Mineral Salts, Lecithin, and Pectin help maintain a healthy gastric environment and support the mucosal lining.

Hingut: A combination of pro, pre, and post biotics support a stable and healthy microbial population in the hindgut. 

 

Can this supplement be fed in damp feed?

We recommend feeding Ultimate Gastro-Ease® as dry as possible as when exposed to moisture for a long period the supplement can be less effective. We advise adding just prior to feeding, or layering between chaff. 

 

How long will it take to help support my horse's digestive system?

This will differ depending on your horse. We always suggest that you feed a supplement for at least 4 weeks at the recommended serving rate for your horse’s weight to see how they respond.