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Ultimate Gastro-Ease®

New name but same complete support for equine gastrointestinal comfort.

298 reviews. 4.9 / 5
Guest - 14/07/2024 20:33
My horse found it unpalatable so wouldn’t eat her feed. Dropped dose to a 1/3 and eventually she ate it. Am persevering.
Guest - 12/07/2024 20:24
My horse is much more relaxed & happier in himself when he is on Ultimate Gastro-Ease & whilst I have tried other brands, Feedmark really is the most effective.
Guest - 11/07/2024 22:17
Massive results with my mare since using this. Won’t ever stop using this again
Guest - 11/07/2024 20:05
Excellent product
Guest - 11/07/2024 18:36
Delivered on time, kojak has been on this for a few months now and he is definitely happier and behaviour has really improved 😊
Guest - 11/07/2024 17:47
This product is amazing!!! After trying out many other supplements, we tried Ultimate Ease and the results were amazing. We now have a much happier and far more pleasant boy, even though he is not ridden anymore, he was very girthy and seemed uncomfortable, he is much happier now. Thank You
Guest - 10/07/2024 20:43
Gastro Ease help guard against the return of my 20 year old horses gastric ulcers.
Guest - 10/07/2024 20:06
I decided to try ultimate gastro ease for my boy as we were moving yards spring grass was coming in all at the same time I believe ultimate gastro ease helped keep my boys tummy happy & healthy with all the changes he was experiencing would definitely recommend
Guest - 08/07/2024 20:10
Really fast convenient delivery. Unsure of how much impact the supplement is having but she enjoys the taste and I'm happy with the ingredients
Natalie - 04/07/2024 22:17
This has been a game changer for my ex racehorse. He was very girthy when tacking up. He is now a different horse.  I have also put my other horse on this supplement to prevent ulcers. Brilliant product. Would highly recommend

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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 work synergistically with the body to support a healthy gastric pH and soothe the mucosal lining of the stomach and small intestine. Lecithin is highly hydrophobic (water hating) whilst Pectin forms a gel-like substance that binds to bile acids when exposed to an acidic environment (Venner et al., 1999; Ferrucci et al., 2003). 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 (Lo Feudo et al., 2021; van der Boom, 2022).

Support for the sensitive microbial population in the hindgut is provided by the unique combination of pre-, pro- and postbiotics in Ultimate Gastro-Ease®. The prebiotics Fructooligosaccharide (FOS) and Mannan oligosaccharide (MOS) provide food sources for beneficial bacteria that are responsible for fermenting fibrous foodstuffs the horse eats. The probiotic YeaSacc® provides a supply of live yeast (Saccharomyces cerevisiae) which is an important component of the microbial population, and which stimulates the cellulolytic activity of bacteria within the hindgut, optimising fibre fermentation (Medina et al., 2002). Saccharomyces cerevisiae also promotes activity of bacteria that utilise lactate (Rossi et al., 1995), and so help to stabilise the hindgut. Postbiotics are the next generation of fermentation products and are now included in Ultimate Gastro-Ease®, strengthening the gastrointestinal support you can provide to your horses.

Postbiotics are defined as “inanimate microorganisms and/or their compounds that confer health benefits to the host” (ISAPP Consensus, 2021). The postbiotic used in Ultimate Ease® includes cell components and metabolites* which have been shown to positively benefit the bacteria within the horse’s gut.

















Research has shown increased volatile fatty acid production by horses fed the postbiotic, demonstrating a positive outcome on fibre fermentation, especially of high-fibre forages (Morgan et al., 2007), making it particularly beneficial for horses and ponies fed low calorie, high fibre diets for metabolic or weight management reasons. Bacteria species within the hindgut were also more consistent in horses fed the postbiotic compared to those fed a control diet (Ganda et al., 2022), making it beneficial for keeping the hindgut stable and reducing digestive disturbance. Research has also shown improved immunity in horses fed postbiotics, making the new Ultimate Ease® formulation beneficial for all horses and ponies (Trench et al., 2021).

Further supporting immunity 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.


*Bioactive compounds produced by yeast and bacteria that are used by the animal to support health

** Disease causing organisms


To read more about the benefits of pre- and probiotics click here 



Ferrucci, F., Zucca, E., Croci, C., Di Fabio, V. & Ferro, E. (2003). Treatment of gastric ulceration in 10 standardbred racehorses with a pectin-lecithin complex. Veterinary Record, 152: 679-681.

Ganda, E., Chakrabarti, A., Sardi, M., Bobel, J.M., Kozlowicz, B., Norton, S.A., Warren, L.K., & Khafipour, E. (2022). A Postbiotic from Saccharomyces Cerevisiae Fermentation Improves Microbiome Robustness in Young Stress-Challenged Horses in Training. Journal of Animal Science, 100(S3): 292.

ISAPP (2021). A roundup of the ISAPP consensus definitions: probiotics, prebiotics, synbiotics, postbiotics and fermented foods. Available at:

Lo Feudo, C.M., Stucchi, L., Conturba, B., Alberti, E., Zucca, E., & Ferrucci, F. (2022). Effects of a nutraceutical supplement in the management of mild equine squamous  gastric disease in endurance horses. Vet Record, 189(11): e942.

Medina, M., Girard, I.D., Jacotot, E., & Julliand, V. (2002). Effect of a preparation of Saccharomyces cerevisiae on microbial profiles and fermentation patterns in the large intestine of horses fed a high fibre on a high starch diet. Journal of Animal Science, 80: 2600-2609.

Morgan, L.M., Coverdale, J.A., Froetschel, M.A., & Yoon, I. (2007). Effect of Yeast Culture supplementation on Digestibility of Varying Forage Quality in Mature Horses. Journal of Equine Veterinary Science, 27(6): 260-265.

Rossi, F., Cocconcelli, P.S., & Masoero, F. (1995). Effect of Saccharomyces cerevisiae culture on growth and lactate utilisation by the ruminal bacterium Megasaphera elsdenii. Annales of Zoologici, 44: 403-409.  

Trench, M., Bobel, J.M., Bazurto, C., Dolly, J., Hansen, T.L., Kirk, N., Lopez, C., & Warren, L.K. (2021). Dietary Saccharomyces cerevisiae fermentate affects mucosal immunity in young stress-challenged horses in training. Journal of Equine Veterinary Science, 100: 103503.

van der Boom, R. (2022). Equine gastric ulcer syndrome in adult horses. The Veterinary Journal, 283-284: 105830.

Venner, M., Lauffs, S., & Deegen, E. (1999). Treatment of gastric lesions in horses with pectin-lecithin complex. Equine Veterinary Journal, supplement (29): 91-96.


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%)



Additive number 

per kg




Kaolinic clay









Soy lecithin









Peppermint oil






Digestive enhancers 



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




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.