Zeolite use for diarrhea: effectiveness and study results

At some point, we wanted to know for sure. How it is with fecal water and zeolite.

Many horse owners report how well their horses recover from fecal water with zeolite – and we at Steinkraft have 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 say about it?

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

Here you will 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 stool consistency, and promoting healthy gut flora.

Because when it comes to our horses, it's not just about intuition – but also well-founded knowledge.

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

Fecal water is not the same as diarrhea. While diarrhea means the entire stool is liquid, horses with fecal water usually produce formed droppings – but in addition, a brownish liquid runs from the anus. And sometimes in astonishing quantities. It's not an emergency, but a silent signal: something is wrong here. You can read more about the causes and home remedies from naturopathy here.

Fecal water 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 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, has an antioxidant effect, 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 effects of zeolite?

The research on zeolite in horses is 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 organized the studies into 4 thematic areas: pollutant binding, intestinal mucosa, stool consistency, intestinal flora.

1. Toxin binding in the intestine

Sources:

• Cerbu et al. (2020) investigated 80 calves with diarrhea. One group additionally received 2% clinoptilolite in their feed. Already after 8 days, the stool consistency had significantly improved, and the frequency of diarrhea decreased significantly. 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 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. Soothing the intestinal mucosa

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) investigated piglets that were fed with 1% clinoptilolite. The animals showed more intraepithelial lymphocytes and a more stable mucous membrane structure. In addition, the proportion of pathogenic germs in the faeces 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. Stabilization of stool consistency

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 a micronized clinoptilolite powder (5 µm particle size) in their feed for 8 days; other groups served as comparisons (antibiotic, tannin extract, untreated).
  Result: Already after one week, diarrhea prevalence in all treated groups decreased significantly, including the zeolite group. While 100% of 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 antibiotic-treated calves). The authors evaluated 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 had less diarrhea, a lower frequency of fecal water, 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 consistency, fewer E. coli bacteria in the faeces, better weight development. 
  The researchers investigated newborn lambs that received different zeolite levels 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 previously mentioned 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 after weaning) was significantly lower in the zeolite group than in untreated piglets. In addition, the bacterial load in the small intestine was reduced (decreased total bacterial count in the jejunum), which indicates improved intestinal hygiene. Interestingly, 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 reduced E. coli shedding, although weight gain remained unchanged..
  
  These consistent results support that zeolite binds excess fluid in the faeces and stabilizes intestinal function. Applied to horses, this means: A suitable zeolite additive could help to thicken watery fecal water and normalize overall stool consistency.
  

4. Promoting a healthy gut flora

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 may be, they do not replace looking at the individual animal. Loose droppings are not a symptom that can be "fixed" with a single remedy. It is often a combination 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's exactly what many horses need: grounding within, 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 might think.

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