Zeolite for Diarrhea in Horses – Efficacy & Studies

Eventually, we wanted to know exactly. What's the deal with hindgut acidosis and zeolite.

Many horse owners report how well their horses recover with zeolite for hindgut acidosis – and we at Steinkraft have also collected many of these experiences over the years. But at some point, that wasn't enough for us. We wanted to understand more deeply: What exactly happens in the horse's gut? And what does science say about it?

That's why we researched – thoroughly, carefully, with an open heart and an alert mind. We sifted through specialist articles, studies, dissertations and practical experiences, not only concerning horses, but also from cattle, pig and poultry farming. Because wherever the intestine gets out of balance, zeolite has been successfully used for years.

Here you will find the results of this search: a collection of scientifically proven findings on how zeolite works in the digestive tract – in binding toxins, protecting mucous membranes, stabilizing stool consistency and promoting a healthy gut flora.

Because when it comes to our horses, not only feeling counts – but also sound knowledge.

What is hindgut acidosis – and what makes it so special?

Hindgut acidosis is not the same as diarrhea. While in diarrhea the entire stool is liquefied, horses with hindgut acidosis usually show formed droppings – but additionally, a brownish liquid runs off the anus. And sometimes in astonishing quantities. It is not an emergency, but a silent signal: something is wrong here. Here you can read more about the causes and home remedies from naturopathy.

Hindgut acidosis is often an expression of a chronic imbalance – be it due to stress, feeding errors, poor hay quality, dental problems, lack of exercise or microbial shifts in the intestine.

How does zeolite work in the horse's gut?

Zeolite is a natural volcanic rock with a special property: its crystalline structure acts like a sponge. It can bind excess acids, toxins, fermentation gases, mycotoxins and even heavy metals. At the same time, it soothes the mucous membranes, has an antioxidant effect and supports the restoration of internal balance. We know all this from Prof. Dr. Karl Hecht.

What do studies and specialist articles say about the effect of zeolite?

The studies on zeolite in horses are still young – but there is a wealth of data from livestock farming (calves, piglets, poultry) that allows conclusions to be drawn.
Here is a scientifically sound overview - I have grouped the studies into 4 thematic areas: pollutant binding, intestinal mucosa, stool consistency, gut flora.

1. Zeolite binds toxins in the horse's gut – what studies show

Sources:

• Cerbu et al. (2020) studied 80 calves with diarrhea. One group additionally received 2% clinoptilolite in the feed. After only 8 days, stool consistency had significantly improved, and the frequency of diarrhea significantly decreased. In addition, body weight remained more stable than in the control group.
  Source: DOI: 10.3390/ani10122284

• Katsoulos et al. (2016) analyzed dairy cows that received aflatoxin-contaminated feed. By adding 1% clinoptilolite, the content of aflatoxin M1 in milk could be significantly reduced – proof of effective toxin binding in the digestive tract.
  Source: DOI: 10.1016/j.anifeedsci.2016.03.001

• Ortatatli et al. (2005) conducted a histological study in chickens exposed to aflatoxins. The group with zeolite showed less liver damage and better overall health. 
  Source: Research in Veterinary Science, 78(1):61–68

2. Zeolite soothes the intestinal mucosa – research results

Sources:

• Wu et al. (2013) used zeolite in broiler chickens. Result: significantly reduced inflammatory markers (e.g. TNF-α), higher villus height in the small intestine, and more antioxidant enzymes such as glutathione peroxidase. This indicates a regenerative effect on the intestinal mucosa.
  Source: Poultry Science 92:684–692

• Valpotić et al. (2016) examined piglets fed with 1% clinoptilolite. The animals showed more intraepithelial lymphocytes and a more stable mucosal structure. In addition, the proportion of pathogenic germs in the feces decreased.
  Source: Veterinarni Medicina 61(6):317–327

• Bartko et al. (1995): In a large-scale study with 2,223 calves, the addition of 5% zeolite to the feed reduced the diarrhea rate from 68.7% in the control group to 18.0% in the zeolite group. In addition, the mortality rate decreased from 4.7% to 1.3%.
  

3. Zeolite improves stool consistency – studies in calves, lambs & piglets

Sources:

• Cerbu et al. (2020) (see above): In addition to toxin binding, the study also confirmed a measurable improvement in stool texture – without medicinal additives. The researchers conducted an in-vivo study on 80 milk-fed diarrheic calves. One group received micronized clinoptilolite powder (5 µm particle size) in the feed for 8 days, other groups served as comparison (antibiotic, tannin extract, untreated).
  Result: After only one week, the diarrhea prevalence in all treated groups decreased significantly, including the zeolite group. While 100% of the calves had diarrhea at the beginning, at the end of the observation period the rate of persistent diarrhea in the zeolite group was significantly reduced (similar to the antibiotic-treated calves). The authors evaluate clinoptilolite as a safe and effective means for symptomatic diarrhea treatment in calves and as a possible alternative to reduce antibiotic use
  

• Sadeghi & Shawrang (2008) conducted a double-blind study on newborn Holstein calves. Calves that received colostrum with zeolite suffered less from diarrhea, had a lower frequency of hindgut acidosis and better daily weight gains. 
  Source: Livestock Science 113:307–310

• Norouzian et al. (2010) gave lambs 3% zeolite for 30 days. Result: significantly firmer stool substance, fewer E. coli bacteria in the feces, better weight development. 
  The researchers studied newborn lambs that received different zeolite contents in their milk replacer for 6 weeks. With a 3% clinoptilolite addition, the lambs showed firmer stool consistency and a lower severity of diarrhea than the control group. At the same time, these lambs gained more weight (+ weight gain) and no negative effects on blood count or health parameters occurred. The authors concluded that zeolite in lamb rearing can reduce diarrhea-related losses and improve performance
  Source: Small Ruminant Research 91:170–173

• Valpotić et al. (2016) (see above): In the same piglet study, the average diarrhea score significantly decreased compared to the control group. In the already mentioned study on 40 weaned piglets, a feed additive of 0.5% clinoptilolite led to significantly fewer diarrhea symptoms. The summed diarrhea score (over 14 days after weaning) was significantly lower in the zeolite group than in untreated piglets. In addition, the germ load in the small intestine was reduced (decreased total bacterial count in the jejunum), which indicates improved hygiene in the intestine. Interestingly, in another study (Song et al., 2014, J. Anim. Sci. 92:173–182), experimentally induced diarrhea in piglets was also mitigated by clinoptilolite – the animals had higher serum IgG levels and lower E. coli excretion, although weight gain remained unchanged.
  
  These consistent results support that zeolite binds excess fluid in the feces and stabilizes intestinal function. Transferred to horses, this means: a suitable zeolite additive could help to thicken watery hindgut acidosis and normalize overall stool consistency.
  

4. Zeolite & Gut Flora – how clinoptilolite stabilizes the microbiome

Sources:

• Wu et al. (2013) (see above): In addition to mucosal benefits, a favorable microbiota shift was also observed: fewer E. coli, more lactobacilli in the gut.

• Song et al. (2014) conducted a randomized study with 96 piglets. The zeolite group showed not only an increase in IgG in the blood (improved immune status), but also a significant reduction in pathogenic bacteria. 
  Source: J. Anim. Sci. 92:173–182

• Lojkić et al. (2017) analyzed over 70 sources in their review. They describe zeolite as naturally antidiarrheal, growth-promoting, pH-stabilizing and immunomodulating. (Periodicum Biologorum 119:159–172)

And yet, every horse remains an individual.

As convincing as many of the scientific findings are – they do not replace looking at the individual animal. Loose stools are not a symptom that can be "eliminated" with a single remedy. It is often a combination of housing, feeding, stress, gut flora, and sometimes even inner history.

Zeolite is not a miracle cure. But a strong, natural ally.
It can relieve the gut environment, stabilize digestion, and gently support the organism. And that's exactly what many horses need: an inner grounding, calm in the system – and a human who listens.

Studies confirm what many have already felt: Nature works.
Quietly, deeply, and sometimes more complex than one thinks.

Studies show what is possible – practice confirms it daily. If your horse suffers from loose stools, zeolite is a proven, natural first step.

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