“Our horses thrive on G-Tract! Both our warmbloods are on it.”
Chris H.
$2.30/day
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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...
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
Why horse owners choose it
Key benefits*
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.
Per 10 g serving (label amounts where published):
| Active / support | Amount |
|---|---|
| Prebiotics (Turkey Tail + Lion’s Mane) | 5,500 mg |
| Probiotics | >3 billion CFU |
| Saccharomyces spp. (live yeast) | 25 billion CFU |
| Bovine colostrum | 1,500 mg |
| Beta-glucans (minimum) | 25% |
Amounts are nutritional facts from the product label / published copy. Not a drug claim.
Based on a 1,000 lb. Horse
Directions for Use: Mix thoroughly into damp feed. One serving = 10 g
Your veterinarian can help tailor the amount to your horse’s workload.
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
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
“Our horses thrive on G-Tract! Both our warmbloods are on it.”
Chris H.
“G-Tract has been part of my horse’s supplement recipe for a couple of years now. He has been looking and moving well.”
Verified buyer
“I’ve noticed a big difference — more trusting and willing. I’ve never had a horse take to a supplement like this.”
Lisa
Customer photos & quotes. Individual results vary. Nutritional support only — not intended to diagnose, treat, cure, or prevent disease.
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.
MOST COMPANIES
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.
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.