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GutWerks Probiotic & Prebiotic


Jini Says +

This is a blend of equine probiotics along with prebiotics (food for the bacteria to eat) and active yeast. You can feed this on it's own, or top-dress it on feed or chaff (chopped hay).

Probiotics are a crucial part of a healthy gut and colic prevention. Especially if you've given your horse antibiotics, drug wormers, or Bute - all these medications should be followed by probiotic supplementation for at least 3-6 months.

FREE SHIPPING! within the Continental USA*

Probiotics, Prebiotics, Active Yeast plus Yeast Culture! HorseTech's GutWerks supplement offers a super-concentrated boost of Horsetech's popular probiotic/prebiotic package along with premium quality yeast culture and live cell yeast! Each two (2) ounce serving (57 grams) of Gut Werks will provide over 20 billion CFU of live, naturally-occurring, beneficial microorganisms and 50 billion live Saccharomyces cerevisiae yeast cells.

GutWerks also includes their prebiotic package (mannanoligosaccharides and fructooligosaccharides), all on a super-palatable Diamond V yeast culture base. GutWerks may also be used at a one (1) ounce per day rate where lower levels of support are indicated. Horsetech's probiotics, prebiotics and live yeast cultures have been selected for performance, viability and stability when mixed in feed--they'll be there when you need them.


GutWerks is an excellent source of yeast culture, active yeast, probiotics and prebiotics--the complete package for digestive support!.

Administer to horses at the rate of 1 to 2 ounces per day. Each level 48cc scoop (enclosed) will hold approximately 1 ounce (28.4 grams). Provide 1 to 2 level scoops per day for mature horses weighing 1,000 lbs. or more. Usage rate may be reduced proportionately, based on weight, for lighter breeds, younger horses, ponies, etc.

Each two (2) ounce serving of HorseTech's GutWerks will provide over 50 billion live, viable yeast cells along with 20 billion CFU of live, naturally occurring beneficial microorganisms (probiotics). The probiotic strains and live yeast cultures used in Yeast+ have been selected for performance, viability and stability in equine diets.

Seal container securely between uses. Store in cool, dry place.

Scoop: 48cc


Sacchromyces cerevisiae yeast, Dried Sacchromyces cerevisiae fermentation product (yeast culture), L-Glutamine, Fructooligosaccharides, Yeast extract (Mannanoligosaccharides), Dried Bacillus coagulans fermentation product, Dried Bacillus licheniformis fermentation product, Dried Bacillus subtilis fermentation product, Dried Lactobacillus acidophilus fermentation product, Dried Lactobacillus casei fermentation product, Dried Lactobacillus plantarum fermentation product, Dried Enterococcus faeciumfermentation product, Natural Flavoring

Per Two (2) Ounce Serving
Per One (1) Ounce Serving
Saccharomyces cerevisiae

50 billion cells

25 billion cells

Naturally-Occurring Microorganisms*

20 billion CFU

10 billion CFU


1,000 mg

500 mg


750 mg

375 mg

Yeast Extract

500 mg

250 mg

Yeast Culture

28,000 mg

14,000 mg

* (20 billion CFU/2 oz. serving: Bacillus coagulans fermentation, Bacillus licheniformis, Bacillus subtilis, Lactobacillus acidophilus, Lactobacillus casei, Lactobacillus plantarum, Enterococcus faecium) 

2 ounces provides: 50 billion CFU live Saccharomyces cerevisiae yeast and 20 billion CFU of live, naturally-occurring microorganisms (probiotics).

1 ounce provides : 25 billion CFU live Saccharomyces cerevisiae yeast and 10 billion CFU of live, naturally-occurring microorganisms (probiotics).

What exactly is "yeast culture?" Yeast Culture is an ingredient produced by fermenting selected liquid and cereal grain raw ingredients with bakers yeast (Saccharomyces cerevisiae) and drying the entire culture-media without destroying the yeast factors, B-vitamins and other fermentation products. It is used in a wide variety of animal feeds including dairy, swine, beef, horse, poultry, aquaculture and petfoods.

In manufacturing yeast culture, the following ingredients are used: Saccharomyces cerevisiae yeast and the media on which it was grown consisting of ground yellow corn, hominy feed, corn gluten feed, wheat middlings, rye middlings, diastatic malt and natural sweeteners.

The live yeast and yeast culture used in the manufacturing of HorseTech's Yeast+ product are both Made in the USA!

FREE SHIPPING! within the Continental USA

*Alaska, Hawaii & International orders: Please contact us for a Discounted Shipping quote; we credit you the equivalent cost of continental USA shipping, and then just charge you whatever is in addition to that. Note that LTYH Shoppe is not responsible for customs issues and no refunds are possible on International orders.

Customer Reviews

Based on 1 review
Bettina E Hamilton
Great product and service.

This is another great product from LTYH shopping. My senior horse adjusted to this with no stomach upset and his chronic diarrhea is much improved. He seems to love the taste. I also give him psyllium seed powder as recommended by Jini, so in combo the diarrhea is under control. Thank you so much!

That's fantastic Bettina! I'm so pleased for you both - great news. I'm sure the micro-milled flax in Sand Trap is also helping the diarrhea as it too is a stool bulking/softening agent. Pysllium, flax and chia seed are the best for bulking stool to relieve diarrhea. Then the soluble fiber also feeds the good bactera; so encourages them to grow. Which, as the gut flora improves over time, heals the root cause of diarrhea. Well done! You could also try the Profile Algal DHA with Flax and Chia, along with Gut Werks, and see how he likes that.