Zeolite for Diarrhea in Horses – Efficacy & Studies

At some point, we wanted to know for sure. How things really stand with fecal water and zeolite.

Many horse owners report on how well their horses recover from fecal water when using zeolite – we at Steinkraft have also collected many such 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 actually say about it?

That is why we did our research – thoroughly, mindfully, with an open heart and an alert mind. We have scoured specialist articles, studies, dissertations, and practical experiences, not just regarding horses, but also from cattle, pig, and poultry farming. Because wherever the gut gets out of balance, zeolite has been used successfully for years.

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

Because when it comes to our horses, it is not just feelings that count – but also sound knowledge.

What is fecal water – and what makes it so distinctive?

Fecal water is not the same as diarrhea. While in diarrhea the entire stool is liquefied, horses with fecal water usually show formed manure balls – but additionally, a brownish liquid runs out from the anus. And sometimes in astonishing quantities. It is not an emergency, but a silent signal: Something is not right here. You can read more about the causes and home remedies from naturopathy here.

Fecal water is often an expression of a chronic imbalance – whether due to stress, feeding errors, poor hay quality, dental problems, lack of exercise, or microbial shifts in the gut.

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, acts as an antioxidant, and supports the restoration of inner balance. We know all this from Prof. Dr. Karl Hecht.

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

The state of research on zeolite in horses is still young – but there is a wealth of data from livestock farming (calves, piglets, poultry) that allows for conclusions.
Here is a scientifically sound overview - I have organized the studies into 4 thematic areas: pollutant binding, intestinal mucosa, fecal 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 received an additional 2% clinoptilolite in their feed. After just 8 days, fecal consistency had significantly improved, and the frequency of diarrhea decreased significantly. Furthermore, body weight remained more stable than in the control group.
  Source: DOI: 10.3390/ani10122284

• Katsoulos et al. (2016) analyzed dairy cows fed with aflatoxin-contaminated feed. By adding 1% clinoptilolite, the level of aflatoxin M1 in the 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 on 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) studied piglets fed with 1% clinoptilolite. The animals showed more intraepithelial lymphocytes and a more stable mucosal structure. Additionally, 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. The mortality rate also fell from 4.7% to 1.3%.
  

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

Sources:

• Cerbu et al. (2020) (see above): Besides toxin binding, the study also confirmed a measurable improvement in fecal texture – without medicinal additives. The researchers conducted an in-vivo study on 80 milk-fed calves with diarrhea. One group received a micronized clinoptilolite powder (5 µm particle size) in their feed over 8 days; other groups served as comparisons (antibiotic, tannin extract, untreated).
  Result: After just one week, the prevalence of diarrhea in all treated groups decreased significantly, including the zeolite group. While 100% of the calves had diarrhea at the beginning, the rate of persistent diarrhea in the zeolite group was significantly reduced at the end of the observation (similar to the antibiotic-treated calves). The authors evaluate clinoptilolite as a safe and effective agent for the symptomatic treatment of diarrhea in calves and as a potential 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 frequently from diarrhea, had a lower frequency of fecal water, and had better daily weight gains.
  Source: Livestock Science 113:307–310

• Norouzian et al. (2010) gave lambs 3% zeolite over 30 days. Result: significantly firmer fecal substance, fewer E. coli bacteria in the feces, better weight gain.
  The researchers studied newborn lambs that received varying levels of zeolite in their milk replacer over 6 weeks. With a 3% clinoptilolite addition, the lambs showed firmer fecal consistency and a lower severity of diarrhea than the control group. At the same time, these lambs gained weight better and no negative effects on blood counts or health parameters occurred. The authors concluded that zeolite in lamb rearing can reduce losses caused by diarrhea 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 decreased significantly compared to the control group. In the aforementioned study on 40 weaned piglets, a feed additive of 0.5% clinoptilolite led to significantly fewer diarrhea symptoms. The cumulative diarrhea score (over 14 days post-weaning) was significantly lower in the zeolite group than in untreated piglets. Furthermore, the bacterial load in the small intestine was reduced (decreased total bacterial count in the jejunum), which points to improved hygiene in the gut. It is interesting that in another study (Song et al., 2014, J. Anim. Sci. 92:173–182), experimentally induced diarrhea in piglets was also alleviated by clinoptilolite – the animals had higher serum IgG levels and lower E. coli excretion, although weight gain remained unchanged.
  
  These consistent results underpin that zeolite binds excess liquid in the stool and stabilizes gut function. Transferred to horses, this means: A suitable zeolite supplement could help to thicken liquid fecal water and normalize overall fecal composition.
  

4. Zeolite & gut flora – how clinoptilolite stabilizes the microbiome

Sources:

• Wu et al. (2013) (see above): Besides 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 of IgG in the blood (improved immune status) but also a significant reduction of pathogenic bacteria.
  Source: J. Anim. Sci. 92:173–182

• Lojkić et al. (2017) analyzed over 70 sources in their review article. 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. Fecal water is not a symptom that can be "fixed" with a single remedy. It is often an interplay of husbandry, feeding, stress, gut flora, and sometimes even internal 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 is exactly what many horses need: inner grounding, peace in the system – and a human who listens.

The studies confirm what many have already felt: Nature works.
Quietly, deeply, and sometimes in more complex ways than one might think.

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

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👉 All experiences with zeolite for fecal water →

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