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Our best-selling supplement, Visceral+ is a comprehensive gut formula to maintain your horse's stomach and hindgut health. Visceral+ supports the function of the immune system, is competition safe, and is recommended by veterinarians.
* Based on a 500 kg (1100 lb) horse at a feeding rate of 80 grams per day
Visceral+ Supports:
  • Stomach Health
  • Overall Well-Being
  • Gut Health
  • Digestive Function
  • Immune System
  • Athletic Performance
  • Energy Metabolism
  • Nutrient Absorption
  • Animal Comfort

Health and wellness start in the gut. Mad Barn’s Visceral+ is our most powerful gut supplement in a convenient pelleted format that horses love.

Visceral+ is formulated with the highest quality natural ingredients including probiotics, yeast, herbs, minerals and amino acids to support your horse’s gut health and immune system.

Visceral+ was developed in conjunction with veterinarians and is clinically tested in horses to help maintain stomach and hindgut health.


Why Use Visceral+?

The incidence of stomach issues has been reported to exceed 95% in performance horses, and a large proportion of pleasure horses have been found to have stomach issues.

Essentially any horse that undergoes stall confinement, has inconsistent access to feed, is fed grain, or is trailered is at risk of developing stomach issues.

Visceral+ works in four key ways to maintain balance in the digestive system:

  • Supports Natural Healing Processes
    • A scientifically formulated combination of ingredients that works with your horse’s natural biology to maintain a healthy intestinal lining.
  • Nutritional Building Blocks
    • Visceral+ is a nutraceutical formula that contains natural ingredients that support your horse’s microbiome and stomach tissue.
  • Comprehensive Protection
    • The stomach represents only 8% of the total digestive system. That leaves a lot of other areas for something to go wrong. Visceral+ contains ingredients that also support the hindgut.
  • Supports the Immune System
    • Upwards of 70% of the immune system is driven by the gut and Visceral+ helps support immune function.

Get Visceral+ to maintain your horse’s stomach and hindgut health!

  • Supports the function of the immune system.
  • Product is competition safe.
  • In a convenient pelleted format that horses love.

Don’t Fight Biology

Go with the natural solution that works with your horse’s biology. Visceral+ works by:

  • Supporting the natural barrier that protects stomach tissue
  • Supporting normal mucin production, which functions as a defensive layer within the gastrointestinal tract
  • Providing probiotic and prebiotic ingredients to maintain hindgut health
  • Supporting normal defences against pathogens by helping to maintain immune health


Visceral+ is clinically tested

The clinical study for Visceral+ was carried out by Halton Equine Veterinary Services. The initial premise of the trial was to examine the effects of Visceral+ in horses with gastric ulcers.

Horses brought to the clinic to be scoped for gastric ulcers were enrolled in the study, with the owners consent, if they presented with obvious ulcers or hyperkeratosis. The horses were treated with GastroGard for 15–30 days. Visceral+ was supplemented one to two weeks prior to cessation of the GastroGard treatment and for another 30 days without GastroGard. All horses were re-scoped at the end of 60 days. All horses showed improvement to complete healing at the end of 60 days.

Visceral+ is a pelleted supplement that works with the body to naturally support stomach and hindgut health, maintaining normal immune defenses against digestive upsets.

You should always consult a qualified nutritionist before altering your feed program. Submit your horse’s diet for analysis online and one of our equine nutritionists will be happy to provide a complementary review.


BIO MOSBio-Mos™ from Alltech™ is a proprietary ingredient made from a specific strain of Saccharomyces cerevisiae yeast. 

Bio-Mos™ has been clinically studied in 734 research trials and is featured in 114 peer-reviewed publications. It has been used for over 20 years to promote gastrointestinal health and integrity in a variety of agricultural animals, including horses.

According to Alltech™, Bio-Mos™ works by supporting the digestive and immune systems. 


CholineCholine serves as a building block for cell membranes and is a precursor of the neurotransmitter acetylcholine.

This nutrient is closely related to B-vitamins. It is a constituent of lecithin which is a type of fatty substance known as a phospholipid.

Docosahexaenoic Acid2022-11-07T11:39:40-05:00

Docosahexaenoic AcidDocosahexaenoic Acid (DHA) is a polyunsaturated omega-3 fatty acid.

DHA is an “essential fatty acid” because it is fundamental for bodily processes, yet it cannot be made in the body and has to be obtained from the diet. DHA can be synthesized from alpha-linolenic acid (ALA), an omega-3 fatty acid found in plant sources. However,  this conversion is poor in all mammals.

DHA can be supplemented directly from marine sources such as fish oil and microalgae.


EMPDietary Escape Microbial Protein (EMP™) from Alltech is a type of protein supplement that isn’t broken down in the gut by microbes.

Amino acids are the building blocks from which proteins are synthesized in the body. There are 21 standard amino acids required by all mammals to form proteins and other biomolecules.

Nine of these amino acids are essential, meaning they cannot be made by the body and must come from food or supplement sources. The nine essential amino acids are histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.


L GlutamineL-Glutamine is the most abundant amino acid that is found in the horse’s body. It plays a role in protein synthesis and cellular energy metabolism.

Glutamine is a conditionally essential amino acid that is required in higher amounts when the animal is experiencing periods of stress or undergoing intensive exercise. Animals can normally produce adequate amounts of this nutrient endogenously (internally), however, under certain circumstances stores of glutamine can become depleted.

Kelp Meal2022-11-07T11:58:35-05:00

Kelp MealKelp meal (seaweed) is a type of brown algae that contains several minerals including magnesium, potassium, iodine, calcium and iron. It is also a source of several vitamins, micro-nutrients and 20 different amino acids.

Kelp is commonly fed as an iodine supplement to support thyroid function.

Dried seaweed meal also contains high levels of polysaccharides, which may act as prebiotics in the hindgut.


LecithinLecithin is a type of natural fatty substance made up of phospholipids such as phosphatidylcholine, phosphatidylinositol, and phosphatidylserine. It is a source of the essential nutrient choline and has been shown to play a role in liver health, neurological health and healthy metabolism.

It is involved in building and maintaining cell membranes throughout the body, including the digestive tract.


Magnesium Oxide for HorsesMagnesium is a macro-mineral that plays an important role in regulating nerve impulse transmission, protein synthesis, energy metabolism and enzyme activity. It is involved in over 300 different enzyme reactions in the horse’s body.

60% of the magnesium in the body is found in the bones and 40% is found in extracellular fluids and soft tissues.

As a supplement, it is best given in the form of inorganic magnesium oxide which has an absorption rate of approximately 56%.

Marshmallow Root Extract2022-11-07T12:13:25-05:00

Marshmallow Root ExtractMarshmallow Root Extract (Althea officinalis) is a herbal supplement purported to ease inflammation. It is a good source of vitamin A, B vitamins, iodine, zinc, calcium, iron and sodium.

MB-5 Strain Probiotic2023-03-20T15:02:11-04:00

MB 5 Strain ProbioticMad Barn’s 5-strain probiotic supplement is a blend of 5 different bacterial strains. Probiotics are beneficial bacteria that support fibre digestion and gut health.

Our MB-5 Strain Probiotic contains 20 billion CFU (Colony Forming Units) per gram of Lactobacillus acidophilus, Lactobacillus fermentum, Lactobacillus casei, Lactobacillus plantarum and Lactobacillus farciminis. Find out more about our probiotic blend here.


MeadowsweetThe flowers and leaves of the Meadowsweet herb are a natural source of salicylic acid, which is the active ingredient found in aspirin. Salicylates are mild anti-inflammatory compounds.


MethionineDL-Methionine is an essential amino acid that acts as a building block for proteins involved in metabolism, growth, liver function and more. It cannot be synthesized internally and must be supplied by feed or supplementation. It is the second-most likely amino acid for a horse to be deficient in.

Methionine is an important component of hoof and hair tissue because it is required for keratin synthesis. It plays a role in central nervous system function and is involved in the synthesis of the neurotransmitter serotonin. It is also necessary for detoxification pathways, is required to produce creatine, and supports the integrity of joints, ligaments, tendons and other connective tissues. Furthermore, methionine is a precursor for taurine, L-Carnitine and the sulfur-containing amino acid cysteine.

The NRC’s Nutrient Requirements of Horses recommends daily intake of 7,500 mg for a 500 kg / 1100 lb horse at maintenance.

Milk Thistle2022-11-07T12:27:46-05:00

Milk ThistleMilk thistle (Silybum marianum) is an herbal supplement commonly used to promote liver health. It contains the active compound silymarin and antioxidants.

Oat Hulls2022-11-07T12:30:45-05:00

Oat HullsOats hulls are the outer envelope of the oat grain and are a co-product of oat processing. The hulls are high in fibre and low in protein and energy. It is used as a low-NSC pelleting substrate.


PeppermintPeppermint contains small amounts of volatile oils like menthol which may support digestive function.

It is also a safe, natural flavour that supports the palatability of Visceral+.

Slippery Elm Bark2022-11-07T12:35:53-05:00