Free Delivery on all orders over £39 *Exclusions Apply*

Synovium Gastrosafe


Synovium Gastrosafe is an award winning veterinary gut supplement for horses. Developed by independent FEI vets to support a healthy gut, optimal gut function and stomach acidity.

Read More


All orders over £39 receive free delivery * *terms and conditions apply


Returns It should be noted that, unfortunately, we cannot accept returns of any labelled products, including prescription medicines and flea and worming products. If the customer has requested a cancellation but the order has already been dispatched then we will not be able to cancel and refund the order. This also applies if the customer has ordered the incorrect dosage. Returns of any labelled products are only acceptable if it is due to an error in processing, or for an official recall. We are also unable to accept the returns of Caninsulin syringes, even if the packaging is unopened.

View More


Synovium Gastrosafe is an award winning veterinary gut supplement for horses. Developed by independant FEI vets to support a healthy gut, optimal gut function and stomach acidity.

It has been extensively researched by a veterinary team and nutrition experts for optimal gastric aid and support for horses with Gastric ulcers.

Gastrosafe supports gastric acidity in horses, provides essential proven prebiotics, whilst supporting the natural anti-inflammatory processes in the front and hind gut.

Suitable for horses with poor appetite, poor condition, poor performance, behavioural changes and those that easily stress.

Ideally fed to horses to help support a healthy gut environment, providing a natural alternative to maintain a healthy GI tract and a happy horse long term. Suitable for use during or after veterinary treatment for Gastric Ulcers.

A veterinary gut supplement will provide support to horses during stressful activities, travelling, competition and changes in routine.

No ingredients in Gastrosafe are listed on the FEI prohibited substances list. Competition safe, Anti-Doping checked. Best ulcer supplement for horses by leading vets.

1.5kg (1 month supply = £1.54 per day ) / 4.5kg (3 month supply = £1.35 per day)

What are Prebiotics?

Prebiotics are a non-digestible food source to support your horse’s existing good gut microbes. Unlike probiotics they do not contain live bacteria.

Prebiotics support the horses good bacteria, for optimum health, by stimulating the growth and activity of the existing microorganisms. So the helpful bacteria remain healthy. Studies prove the benefits of supplementing horses with Prebiotics for gut health.

It is still an ongoing study to understand what is best to feed your horse for gut support and therefore it is always recommended to speak to your vet for advice. There are many theories on Probiotics but nothing concrete, unlike with Prebiotics.

Synovium Horse Health bases its supplements on only proven science and trials. Always ask advice of your vet if you suspect your horse has ulcers.

Read more about Prebiotics vs Probiotics

Gut supplement for horses – Gastrosafe – Best ulcer supplement for horses
Veterinary gastric supplement for horses; for use on horses with a sensitive gut.

Horses are hindgut fermenters, therefore meaning that the large intestine is where breakdown of fibre takes place.

Fibre is the main component of the horse’s forage which is broken down by microorganisms to produce essential nutrients that the horse absorbes.

Because the hindgut is geared for fibre fermentation, it be sensitive due to receiving large amounts of undigested sugars.

Equine Gastric Ulcer Syndrome (EGUS) frequently referred to as gastric ulcers in horses is a common problem.

Does my horse need an ulcer supplement? Does my horses have gastric ulcers (EGUS)?

Identifying those horses with gastric ulceration can be difficult as early signs can be confused with colic. Horses with ulcers can show mild colic-like symptoms so learn to read the signs of EGUS.

Equine gastric ulcers have been recognised more in recent years and it is important to understand the condition, why it can occur and the symptoms to look out for, to help prevent the high occurrence for future horses.

Some typical clinical signs of EGUS may include:

  • Poor or fussy appetite
  • Weight loss
  • Poor condition, dull coat
  • Reduced performance
  • Behavioural changes
  • Unwillingness to work
  • Mild or recurrent colic
  • Loose stools

Ulcers can affect any horse, but it is particularly prevalent in performance horses. They can occur in the horse’s stomach when the digestive acids come in contact with and attacks the protective lining of the stomach, mainly in the upper regions of the stomach.

The figures speak for themselves, with 60% of sports horses, 93% of racehorses and 50% of stabled foals showing to be affected by gastric ulceration.

Gastrosafe gut supplement for horses contains:

Calcium carbonate
Seaweed – Studies have shown that Laminaria hyperborea creates a floating raft of gel which helps to protect the non glandular part of the stomach from excess acid.

Horses produce stomach acid 24/7, which easily leads to acid splash causing ulceration on the non glandular parts of the stomach. Seaweed helps give that extra protection.

Magnesium Hydroxide
Fructooligosaccharides – proven prebiotics which provide food for and help stimulate good bacteria in the gut. Fructooligosaccharides are chains of specific types of carbohydrates which help promote the growth of organisms beneficial to the health of horses.

Prebiotics reach the hindgut where they are broken down by specific microbes to function. Helping to maintain a healthy gut environment and support efficient digestion and nutrient absorption.

Glutamine – Amino acid
Threonine – Amino acid important for mucin productin in the gut

If you require a daily horse calmer with added gut support please try our Mgnium horse supplement. You can also ready about the effects of Magnesiumand why it is important the horses body functions. Take a look at our instant horse calmers that are competition safe.

Find out more about Synovium and the team of vets.

Horse Gut Health Supplements Ulcers


*Measuring spoon of 50 ml contains 48 grams.*

Horse Loading: add 2 scoops per day to feed for 10 days, split into two feeds for best results. Continue on 2 scoops if directed by your vet.

Horse & Pony Maintenance: add 1 scoop per day, split into two feeds for best results ( 1.5kg = 1 month supply / 4.5kg = 3 month supply )

Foal: add 1/2 scoop to the feed daily, split between feeds where possible.

Check out our full range of Synovium products here