Synovium® Gastrosafe – Healthy Gut

Synovium® Gastrosafe – Award-Winning Veterinary Gut & Ulcer Supplement for Horses

Support your horse’s gastric health with Synovium® Gastrosafe – a scientifically proven, veterinary-formulated horse ulcer supplement designed to promote a healthy digestive tract and enhance overall performance. Ideal for horses showing signs of gastric stress, poor appetite, weight loss, or behavioral changes.

Gastrosafe is a competition-safe, natural gastric aid for horses – developed by independent FEI vets and backed by scientific studies showing clear benefits within just 6 weeks of feeding.

✅ Why Choose Gastrosafe?

• 🏆 Award-Winning Veterinary Gut Supplement for horses
• 🔬 Scientifically proven results after 6 weeks of use
• 🌿 Natural, Non-Doping Formula – Safe for competition (FEI Anti-Doping checked)
• 🐴 Suitable for horses with ulcers, poor condition, performance drops, or stress-related behavior
• 💚 Supports appetite, gut lining repair, and long-term gastric comfort

🔍 Key Ingredients & Benefits

• Calcium Carbonate (E170) – 9.6g/day: Soothes and protects the stomach lining
• Seaweed (Laminaria hyperborea) – 4.8g/day: Rich in natural vitamins and minerals
• Magnesium Hydroxide (E528) – 4.8g/day: Effective antacid to balance pH
• Fructooligosaccharides – 4.8g/day: Prebiotics to fuel healthy gut bacteria
• Glutamine – 1.82g/day: Repairs gut lining and supports immune health
• Threonine & Kaolin: Essential amino acid and digestive support

✔️ Suitable For:

• Horses prone to gastric ulcers
• Horses in training or competition
• Horses under stress or post-treatment
• Performance horses with behavioral issues

🛡️ Competition Safe & FEI Compliant

Gastrosafe contains no ingredients listed on the FEI Prohibited Substances List – making it safe for use in high-level sport and under veterinary supervision.

Feeding Instructions

Feed 100g per day (divided into two feeds if possible). Results typically seen within 4–6 weeks of consistent use. Can be used long-term.

🛒 Order Now for a Healthier Gut & Happier Horse

Thousands of horse owners trust Synovium® Gastrosafe as a proven, natural alternative to maintain equine gastric health. Try it today and see the difference in condition, behavior, and performance.

Explore more gut health supplements →

NEW REFILL 4.5kg NOW AVAILIBLE

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

Veterinary gastric supplement for horses; for use on horses with a sensitive gut. What is the best horse supplement for ulcers?

Horses are hind gut 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 absorbs.

Because the hind gut 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:

Gastrosafe is specially formulated to support optimal gastric health in horses, helping to manage acid levels and maintain a healthy digestive system. Its unique blend of natural ingredients includes:

• Calcium Carbonate – A natural antacid that helps neutralize excess stomach acid.

• Seaweed (Laminaria hyperborea) – Research shows this specific seaweed forms a gel-like raft in the stomach, providing a protective barrier against acid splash, especially in the non-glandular (upper) part of the stomach where ulcers commonly develop.

• Magnesium Hydroxide – Supports horses prone to stress by replenishing magnesium, an essential mineral often depleted under pressure.

• Fructooligosaccharides (FOS) – These proven prebiotics feed beneficial gut bacteria, promoting a healthy microbiome. FOS are specific carbohydrate chains that reach the hindgut, where they’re broken down by microbes to help maintain digestive balance and support nutrient absorption.

• Glutamine – An important amino acid that supports gut lining integrity and recovery.

• Threonine – An essential amino acid involved in mucin production, which helps protect the gut lining.

• Kaolin – A gentle anti-diarrheal ingredient that helps firm up loose, watery stools.

Did you know?
Horses produce stomach acid continuously throughout the day. Without regular buffering from saliva or food, this can lead to acid splashing and ulceration. Gastrosafe helps form a protective layer to reduce the risk of this common issue.

Looking for Calm and Digestive Support?
If your horse requires daily calming support with added gut health benefits, try our Mgnium Horse Supplement. It’s formulated with high-quality magnesium and supports both nervous system balance and digestive health.

Also, explore our instant calmers, which are competition safe and ideal for pre-event use.

Find out more about Synovium and the team of vets.

What is the best horse supplement for ulcers? Check out our top Gastrosafe Reviews

“My event horse was recently diagnosed with gastric ulcers and I started using Gastrosafe alongside his treatment from the vets. I’ve carried on with it and have noticed a huge difference in his appetite, condition and performance. I really rate this product, there are so many on the market that claim to do the same thing so I liked the evidence available that support the use of this product. I can not recommend it highly enough.” Rebecca Cook

“Can’t recommend this product enough! I’ve had my best horse on the gastro safe supplement for a couple of months now and he is so much happier. Having tried loads of different brands before, I can really tell the difference with synovium! 100% the best.” Daisy McKinley

“One of my top horses needs support with his gut as he will drop condition very easily. Since feeding him Gastrosafe he is much happier. He looks better in himself and has become stronger physically. I highly recommend this product as it has helped Pod’s performance immensely.” Aimme Jones

“We really rate this product . We have a very sensitive mare on it and really feel she is much happier on it . She has always needed support with her gut, we have tried lots of different products and this is by far the best.” David Coombs