ImmuBiome G-Tract
ImmuBiome G-Tract
ImmuBiome G-Tract
ImmuBiome G-Tract
ImmuBiome G-Tract
ImmuBiome G-Tract - ImmuBiome
ImmuBiome G-Tract
ImmuBiome G-Tract
ImmuBiome G-Tract
ImmuBiome G-Tract

ImmuBiome G-Tract

$69.00
Delivery

Add a name and we’ll label this item with it in your cart and on your order. Handy if you feed more than one horse.

Size: 300g

300g
600g
1.8kg
10kg

30-day returns, even opened tubs  Ships from Idaho in 1–3 business days  FEI-friendly / show-safe  Made in USA

Foregut-to-hindgut digestive support with ImmuBiome G-Tract Support your horse’s entire digestive system, from foregut to hindgut, with ImmuBiome G-Tract. It’s formulated for horses whose owners want everyday gut...

Description

Foregut-to-hindgut digestive support with ImmuBiome G-Tract

Support your horse’s entire digestive system, from foregut to hindgut, with ImmuBiome G-Tract. It’s formulated for horses whose owners want everyday gut comfort and digestive balance—especially through training, travel, and feed changes.

What’s inside

  • Prebiotics: 5,500 mg per serving from Turkey Tail and Lion’s Mane mushrooms to feed beneficial gut bacteria.
  • Probiotics: Over 3 billion CFU per serving to support a balanced microbiome and nutrient absorption.
  • Saccharomyces spp.: 25 billion CFU of live yeast cultures to support healthy digestion.
  • Bovine colostrum: Nutrients that support the natural health of the stomach and gut lining.
  • Beta-glucans: 25% minimum to support immune and gut resilience.

Why horse owners choose it

  • Stomach & gut lining support: Helps maintain a healthy stomach lining and normal digestive comfort.
  • Foregut and hindgut support: Everyday nutritional support for the whole digestive tract.
  • Trusted by professionals: Veterinarian-recommended as part of a digestive wellness routine.

Key benefits*

  • Helps maintain a healthy gut microbiome for digestion and immunity.
  • Supports a healthy stomach lining and normal gut comfort.
  • Supports digestive balance during training, travel, and feed changes.
  • Supports overall vitality and performance.

Ingredients you can trust
Organic Turkey Tail and Lion’s Mane mushrooms, live Saccharomyces spp., probiotic strains, bovine colostrum, and fungi-derived polysaccharides—all chosen to support digestive health.

How to use
Mix into damp feed daily, following the label directions. Your veterinarian can help you tailor the amount to your horse’s workload and needs. If your horse shows signs of colic, poor appetite, or weight loss, call your veterinarian first.

Give your horse the guts to perform
Pair G-Tract with plenty of forage, turnout, and a low-sugar diet for an easy daily way to support comfort and digestion—in training, at shows, or at home.

*These statements are about nutritional support. ImmuBiome supplements are not intended to diagnose, treat, cure, or prevent any disease. Talk with your veterinarian about your horse’s specific needs.

Ingredients

Per 10 g serving (label amounts where published):

Active / supportAmount
Prebiotics (Turkey Tail + Lion’s Mane)5,500 mg
Probiotics>3 billion CFU
Saccharomyces spp. (live yeast)25 billion CFU
Bovine colostrum1,500 mg
Beta-glucans (minimum)25%
Full ingredient list

Ingredients
Contains a proprietary blend of organic Trametes versicolor (Turkey Tail) and Hericium erinaceus (Lion’s Mane) mushroom mycelium, primordia, fruiting bodies and extracellular compounds, Saccharomyces cerevisiae, Saccharomyces cerevisiae boulardii, hydrolyzed yeast, bovine colostrum, Fenugreek, Bifidobacterium bifidum, Bifidobacterium longum, Enterococcus faecium, Enterococcus thermophilus, Lactobacillus acidophilus, Lactobacillus bulgaricus, Lactobacillus casei, and Lactobacillus plantarum, fungi derived polysaccharides.

Active Ingredients
Per 10 Gram Serving
Probiotics: 3 billion cfu
Prebiotics: 5,500 mg
Saccharomyces spp: 25 billion cfu
1,3-1,6 Beta Glucan: 25% min.
Colostrum: 1,500 mg

Amounts are nutritional facts from the product label / published copy. Not a drug claim.

How to Use

Based on a 1,000 lb. Horse

  • Basic Maintenance 10 g daily (one serving)
  • Higher-demand periods 10 g morning and 10 g evening

Directions for Use: Mix thoroughly into damp feed. One serving = 10 g

Your veterinarian can help tailor the amount to your horse’s workload.

Benefits
  • Probiotics and prebiotics work together to support a balanced gut microbiome*
  • Supports gastrointestinal health with Saccharomyces boulardii*
  • Supports a healthy stomach and hindgut lining*
  • Supports nutrient absorption and assimilation*
  • Nucleotides support the natural protective function of the mucosal lining*
  • Supports normal digestive comfort*
  • Supports normal manure consistency*
  • Supports overall digestive health and function*
  • Supports immune health through gut health*
  • Supports digestive balance during travel and feed changes*
  • Supports feed efficiency and nutrient uptake*
  • Supports a healthy balance of gut bacteria for long-term digestive wellness*

*These statements are about nutritional support. ImmuBiome supplements are not intended to diagnose, treat, cure, or prevent any disease. Talk with your veterinarian about your horse’s specific needs.

Best For
  • Hindgut & stomach comfort
  • Horses in training, travel, or feed changes
  • Show and performance horses
  • Gut lining support
  • Coat & condition
  • Overall wellness
Which formula?

Choosing between formulas? The Formula Finder asks about your horse’s main goal, discipline and age, then suggests where to start.

Take the Formula Finder

Pairs well with

G-Tract300g · $69.00
Lean Muscle420g · $134.00

Lean Muscle brings colostrum, Reishi and its own probiotics alongside G-Tract’s digestive support, plus help with topline and condition. A nice match for horses who need both.

Both, 300g + 420g: $203.00

The Power of ImmuBiome

Immubiome blends medicinal and nutritional superfoods, known for their health benefits, using only human-grade, natural ingredients. Our unique technology combines Eastern and Western approaches to create high-quality nutraceuticals that support intestinal health, essential for top-performing equine athletes.

Day 1 Colostrum

Pure human-grade bovine colostrum, collected within 16 hours of calving and gently processed, supports immune function, normal tissue maintenance, a healthy gut lining, nutrient absorption, lean muscle, and athletic performance.

Pre & Probiotics

The equine gastrointestinal tract requires a balance of good and bad bacteria for health; ImmuBiome products support this with several probiotics at 3 billion per serving and prebiotic polysaccharides to maintain a healthy gut microbiome.

Proprietary Mushroom Blend

Our proprietary blend of organic mushroom mycelium, primordial fruiting bodies, and extracellular compounds harnesses powerful natural extracts to enhance immune function, support cellular health, and promote overall vitality.

1,3-1,6 Beta Glucan

Beta-glucans interact with immune cells to support the body's natural defenses, healthy gut function, and overall resilience.

ImmuBiome Technology

Our proprietary nutraceuticals are formulated with key ingredients designed to support the health and performance of equine athletes, including:

Full-spectrum medicinal mushrooms

100% human-grade bovine colostrum

Prebiotics and probiotics

Beta-glucan and related polysaccharides

Discover how each of these powerful ingredients contributes to the overall wellness and vitality of your horse.

Full-spectrum medicinal mushrooms

For centuries, traditional Eastern practices have used mushrooms to support health and vitality. These functional mushrooms are complex organisms that offer a range of beneficial compounds. They contain natural digestive enzymes, dietary fibers, and prebiotics, along with highly bioavailable vitamins such as vitamin D2. Additionally, they provide chelated minerals that promote natural absorption, essential amino acids, and beta-glucans. Mushrooms are also rich in polyphenols and antioxidants, including L-ergothioneine, one of the most potent antioxidants available. This combination of nutrients makes functional mushrooms a great ally in supporting overall health.

100% human-grade bovine colostrum

Our nutraceuticals feature 100% pure, human-grade bovine colostrum, collected within the first 16 hours of calving and gently processed to preserve its fragile proteins. Colostrum is rich in immune and specialized proteins that support normal immune function, tissue maintenance, and a healthy gut lining. It also supports digestion, nutrient absorption, and lean muscle growth. With nutrients that support strength, stamina, and recovery, colostrum is a valuable addition for equine athletes in intense work.

Prebiotics and probiotics

The equine gastrointestinal tract hosts a complex balance of beneficial and harmful bacteria. Maintaining this balance is crucial for your horse's overall health. Beneficial bacteria, or probiotics, help control harmful bacteria by competing for space along the intestinal wall. Prebiotics, often called "food" for probiotics, are equally important for optimal gut function. ImmuBiome products feature multiple probiotic species, delivering 3 billion per serving, along with full-spectrum mushroom preparations that act as natural prebiotics for hind-gut bacteria. Regular replenishment of prebiotics and probiotics supports a healthy and balanced gut microbiome.

Beta-glucan and related polysaccharides

β-glucan is a polysaccharide recognized for its immune health benefits and can be found in sources like mushrooms, yeast, algae, cereal grains, and bacteria. However, not all beta-glucans are equally effective in triggering immune responses. Their biological activity depends on factors such as molecular structure, branching, solubility, molecular weight, solution conformation, and methods of extraction and purification. Beta-glucan extracts are preferred because they can pass through the intestinal epithelial barrier via specialized M cells, allowing interaction with immune cells. In our nutraceuticals, we use two types of beta-glucans: mushroom and yeast-derived.

As experienced horsemen, we believe you should get what you paid for.

At ImmuBiome, we crafted these products to ensure that every serving is packed with active ingredients, free from sugars and fillers. We maintained the highest quality standards without compromise.

MOST COMPANIES

The Miraculous Mushrooms of ImmuBiome

Mycotherapy, rooted in Traditional Chinese Medicine, is now gaining popularity in the West. ImmuBiome, with over a decade of experience, crafts targeted equine supplements by carefully selecting and extracting the most beneficial compounds from medicinal mushrooms to support high-performance horses.

Each formula is unique, featuring one or more of our incredible mushrooms!

Lion's Mane

Traditionally valued for nerve and cognitive support, Lion’s Mane supports healthy nerve function and the normal maintenance of nerve tissue.

Reishi

Supports central nervous system health, muscle relaxation, and everyday comfort. Rich in antioxidants, it supports a balanced response to seasonal triggers. Functions as an adaptogen, helping the body adapt to stress (physical, mental, and environmental).

Cordyceps

Popular in Tibet, this mushroom supports mitochondrial function, cellular energy, and healthy circulation and oxygenation. It also supports normal reproductive health in breeding stallions.

Turkey Tail

Rich in polypeptides, it helps support a balanced immune system and upper respiratory health, and provides antioxidant support.

Antrodia camphorata

The most popular mushroom in Taiwan, it supports healthy liver and kidney function and the liver’s natural detox processes.

Maitake

Supports healthy immune function and helps maintain blood sugar levels already within the normal range, offering comprehensive support for overall well-being.

King Trumpet

Supports bone and skeletal health with high levels of natural L-ergothioneine, an antioxidant that supports normal comfort.

Chaga

Known as the "King of Mushrooms," it supports overall well-being, a normal stress response, and healthy aging. Rich in antioxidants like melanin, polyphenols, superoxide dismutase, and catalase, it helps neutralize free radicals.

Hear from our Veterinarians

Watch our video to hear what veterinarians are saying about ImmuBiome. For years, we've partnered with top vets to develop unique, high-quality active ingredients tailored for elite equine athletes. Our specialized nutrition is designed to meet the rigorous demands of competitive show schedules safely and effectively. ImmuBiome products are more than just supplements—they're precision-crafted tools trusted by veterinarians to deliver exceptional performance without the worry of toxic side effects or ingredient overlap. Discover the pinnacle of nature-inspired innovation in equine health.

Frequently Asked Questions

View answers to our frequently asked questions
Are ImmuBiome products show safe?
Does ImmuBiome use fillers?
Why does ImmuBiome use human-grade ingredients?
Why does ImmuBiome use colostrum vs whey protein?
Which ImmuBiome product is best for an easy keeper or metabolic horse?
Can ImmuBiome products be used with other supplements?
Do you have any tips for picky eaters?
What is GMP/cGMP?

At ImmuBiome, we are committed to ensuring your animals remain healthy, perform optimally, and recover swiftly. Your satisfaction with the results in your horse is our priority, which is why we offer a 100% Client Satisfaction Guarantee.

Real Clients. Real Results. Real Reviews.

HorseProductHorsesSupplementG-tractBodyBunchGeldingGut supplementStuff
  • 5 stars: 728 (94%)
  • 4 stars: 42 (5%)
  • 3 stars: 4 (1%)
  • 2 stars: 1 (0%)
  • 1 star: 1 (0%)
K
Kat T. (United States)
What is your horses estimated workload?: Light
What is your horses discipline?: Other
What is your horses age?: 8 to 12
Leaky Gut

My gypsy Vanner has what my trainer says is leaky gut. I bought this and as soon as I started the two scoops she seemed to improve. But now it looks like it’s back full force so I’m not sure what to do. I may have to call the vet.

S
Sara C. (United States)
What is your horses estimated workload?: Light
What is your horses discipline?: Other
What is your horses age?: 13 to 20

Awesome stuff. My dsld mare gets Bute every other day and this seems to help her gut stay healthy

C
ChrisH (Canada)
What is your horses estimated workload?: Medium
What is your horses discipline?: Show Jumper
What is your horses age?: 8 to 12
Our horses thrive on G-tract!

Our horses thrive on G-tract! Both our warmbloods are on G-tract and they thrive with this supplement!

N
Neeley W. (United States)
What is your horses estimated workload?: Light
What is your horses discipline?: Other
What is your horses age?: 1 to 3
G-Trac It Works!

Have a 6 month old fill on this 4 months who had lived with water stool syndrome from antibiotics treatment at a day old. Finally real stools. Yay! It works!

B
Brenda W. (Canada)
What is your horses estimated workload?: Medium
What is your horses discipline?: Dressage
What is your horses age?: 8 to 12
Penny's journey with ulcers

Hi my horse had chronic glandular ulcers after rehab and also 3 times on antibiotics. After two years of unsuccessful recoveries I decided to ditch the gastroguard which was costing me $1500 month (Canada) and invest in other things to fix her microbiome. I found a vet that would prescribe misoprostal and I purchased G-Tract and also Rite trac from Kentucky Equine Research. I also bought drug store purchased Nexium which didn't work by itself in the past. This time I saw results ! After 3 years of dealing with ulcers I finally got the right balance. Immunubiome is now being fed as maintenance and we are back in a great training program. I couldn't be happier. Incidentally I am waiting on the results of a study I participated in on microbiome testing on horses here in Canada that have had chronic ulcers.

C
Caitlin C. (United States)
What is your horses estimated workload?: Medium
What is your horses discipline?: Western
What is your horses age?: 4 to 7
My horse’s health is back on track

I’ve been using the G-Tract supplement for over 6 months now and it has been a lifesaver for my horse. He has had a bunch of health issues over the last year. One of the toughest symptoms we were battling was fecal water syndrome. My vet recommended I find a probiotic supplement with Saccharomyces in it. That led me to this supplement. My horse hasn’t had any gut issues since. It is very clear he is feeling so much better. My horse is also on EPM treatment at the moment, which can be very hard on their guts. This supplement has really helped prevent any gut related side effects.

B
Becca (United States)
What is your horses estimated workload?: Light
What is your horses discipline?: Hunter Jumper
What is your horses age?: 21+
Nothing else worked …

My beloved senior gelding has had gut issues since getting Lyme disease a decade ago. Undiagnosed for 2.5 years, and many stressful barn moves later, his gut was never right. I tried everything under the sun and nothing would relieve his chronic gas, which was so painful he couldn’t be ridden faster than a walk. This combined with Lean Muscle gave him the comfort he needed - at least during the non-grass seasons. This Spring, he was suffering again when the pasture came in; turns out he now has PPID, just started treatment, and is uncomfortable in his gut again. We’ll see what happens once his new meds help his decreased ability to absorb nutrients … hopeful this will continue to work and grateful to be heading into no-pasture seasons!!

L
Lisa (United States)
What is your horses estimated workload?: Heavy
What is your horses discipline?: Dressage
What is your horses age?: 8 to 12
Ziggy

Ive noticed a big difference in My horses nervousness. he's not spooking like he was. more trusting and willing. Ive never noticed a change with any other supplement I had given him, I was just hoped they were helping.

A
Anonymous (United States)
What is your horses estimated workload?: Light
What is your horses discipline?: Other
What is your horses age?: 13 to 20
Healthy Horse

Immunize G-Tract has been part of my horse’s supplement recipe for a couple of years now. He has been looking and moving better than ever.

M
Maria D. (United States)
What is your horses estimated workload?: Light
What is your horses discipline?: Dressage
What is your horses age?: 13 to 20
Probiotic gem!

My mare is struggling with chronic Lyme and we started her in your probiotic a few weeks ago to boost her immune system via her gut health. We were thrilled to discover your product because it is all-inclusive as well as free of fillers and sweeteners. She is severely insulin resistant and yours is the only pure product. She is also a supremely picky eater, but licks every bit of this yummy powder from her feed tub. Thank you so much for creating this product.

E
Ellen S. (United States)
What is your horses estimated workload?: Medium
What is your horses discipline?: Dressage
What is your horses age?: 8 to 12
OUTSTANDING!

For my sweet, 10-year-old Oldenburg gelding, Wingman, this product has been a game-changer! He is a very picky eater and every saccharomyces supplement I have tried to feed him has been received with a two-hooves-down. Then I found Immu-Biome! He eats it and more importantly, I love how it is helping his sensitive tummy!

S
Stephanie B.
What is your horses estimated workload?: Heavy
What is your horses discipline?: Show Jumper
What is your horses age?: 13 to 20
Amazing

My mare has had basically chronic stomach ulcers. We treated them and I wanted to put her on a supplement to help keep them away. Since being on this supplement for a few months now, she has been SO happy and her body overall has never looked better!!!

G
Gayanne G. (United States)
What is your horses estimated workload?: Light
What is your horses discipline?: Other
What is your horses age?: 13 to 20
Love this!

While it wasn’t confirmed my OTTB had ulcers, he has had them before and displayed the same symptoms. When he stopped eating his grain I knew. Immubione was recommended and within 3 weeks he was much happier! I now use it for maintenance. Interestingly he didn’t like the taste so I put some honey on for a few days. After about a week he still wasn’t really eating much of his grain yet but would eat all the grain that had the Immubiome. It was like he knew it was helping! At that point it was molasses free.

R
Rose (Canada)
What is your horses estimated workload?: Medium
What is your horses discipline?: Dressage
What is your horses age?: 8 to 12
Early results

It’s been less than a month but already my gelding seems more energetic, his appetite is improved and he is happy to work.

K
Kate S. (United States)
What is your horses estimated workload?: Medium
What is your horses discipline?: Dressage
What is your horses age?: 13 to 20
Only the Best for my horse

I love my horse and only want the finest ingredients going into his body. He gives 100+% to me and I give it right back.

L
Lori D. (United States)
What is your horses estimated workload?: Medium
What is your horses discipline?: Western
What is your horses age?: 1 to 3
Best Ulcer Supplement out there

I was looking for an ulcer supplement. I had tried a bunch that didn’t work. I tried the G Tract and love it. It works great. Very affordable

A
Angie F. (United States)
What is your horses estimated workload?: Heavy
What is your horses discipline?: Hunter Jumper
What is your horses age?: 4 to 7
Seems to be working!

My horse has chronic bleeding ulcers and I’ve tried every gastric supplement on the market with no luck. This supplement seems to be doing the trick!

C
Charlotte N. (United States)
What is your horses estimated workload?: Light
What is your horses discipline?: Other
What is your horses age?: 21+
Improved gut health

My 24 year old horse had eaten some hay that had powdery mildew that we didn't notice at first because the hay went bad while in storage in a barn that was not ventilated very well during the summer months. My horse's diarrhea was pretty bad and I had already tried other remedies such as kaolin and a particular kibble supplement meant to improve gut health. I decided to try ImmuBiome G-Tract, even though it costs quite a bit. I saw improvements after I used it after 3 to 4 weeks (we had already replaced all the hay to some good quality hay). After 2 months, his upset GI tract was completely normal and continues to be so. I continue to use it because it maintains my horse's health by adding healthy natural supplements to his diet. He is all around healthier due to this supplement.

K
Kellie (United States)
What is your horses estimated workload?: Heavy
What is your horses discipline?: Hunter Jumper
What is your horses age?: 8 to 12
Nothing else worked!

Using this on a horse who tends to have skin issues and get cellulitis. Since staring 1 month ago, his skin issues are resolving and no cellulitis again, despite lots of snow and mud. Very happy!!