My Research on Probiotics for Kidney Failure: Beyond Just the Supplement
When you are faced with a diagnosis of Chronic Renal Failure (CKD) in your cat or dog, the attention is almost obsessively focused on the kidneys. It’s natural. However, in my research and my naturopathic experience supporting so many animals, I have understood a fundamental truth that often escapes us: the key to slowing down the disease lies in the gut.
Today I want to share with you what I discovered about the Gut-Kidney Axis and how the strategic use of specific probiotics can activate what in technical jargon we call “Enteric Dialysis”.
Why I shifted my attention to the intestine (Enteric Dialysis)
It is not simply a matter of giving just any lactic ferment. It involves using selected bacterial strains that act as “scavengers”: they feed on the nitrogen and urea present in the intestine, trapping them and allowing the animal to expel them with its feces. The result? Fewer poisons in the blood, less nausea for the cat, and lighter kidneys.
Probiotics for Cats with CKD — Which to Choose (Studied and Tested)
Published December 9, 2020 — Last updated February 2026
Which probiotics do I recommend for chronic kidney disease (CKD) to slow the progression of the illness in cats and dogs? Premise: in chronic kidney disease, the intestinal microbiota is directly involved in the increase of uremic toxins, because the dysbiosis induced by uremia itself increases the concentrations of toxins in circulation, with consequent reduction of renal excretion and worsening of the disease.
Probiotics for Feline CKD
Chronic kidney disease (CKD) affects more than 30% of elderly cats, representing the leading cause of death in felines over 10 years of age. In recent years, the gut-kidney axis approach has revolutionized the management of the disease, with probiotics at the center of therapeutic strategies.
What Is the Gut-Kidney Axis and Why Is Indoxyl Sulfate the Key Toxin?
In cats with CKD, damaged kidneys are unable to eliminate the uremic toxins produced by the intestinal microbiota. The most studied is indoxyl sulfate (IS): derived from tryptophan metabolized by intestinal proteolytic bacteria, it is absorbed into the blood and causes:
- Oxidative damage to the renal tubular epithelium
- Acceleration of renal fibrosis
- Faster progression of IRIS stage
- Direct correlation with survival (Journal of Veterinary Internal Medicine study, 2019)
A healthy cat has serum IS levels below 5 µg/mL. In cats with stage 3 CKD, levels often exceed 15–20 µg/mL. Reducing IS is now considered a primary therapeutic endpoint in the management of feline CKD.
Probiotics for Feline CKD (2026)
Visbiome Vet® — Veterinary Use in CKD
Visbiome has a specific formulation for animals (dogs and cats) with an explicit indication for maintaining normal kidney function.
Composition of Visbiome Vet — 8 strains (DSM codes 24730–24737), totaling 112.5 billion CFU per capsule.
Official indications (FDA label):
- Supports a normal inflammatory response in the GI tract
- Helps maintain normal kidney function
Detailed Analysis of Each Product for Feline CKD
Vivomixx Classic vs Vivomixx Neo — Watch Out for the Formulation!
Vivomixx classic (available until 2024) contained the original De Simone Formulation (DSF): 8 specific strains studied in over 80 human clinical trials. The DSF has been shown to reduce indoxyl sulfate by modulating the intestinal microbiota.
Since 2024, Vivomixx Neo has replaced the classic version with a new 9-strain blend (460 billion CFU). Critical warning: Vivomixx Neo is NOT the original DSF and does not yet have scientific evidence for feline CKD. For renal applications, CDS22-formula is preferable.
💡 WHERE TO FIND THE ORIGINAL DSF IN ITALY IN 2026 The original De Simone Formulation is now marketed as CDS22-formula (direct brand of Prof. Claudio De Simone). It is available online on authorized sites and in some specialist pharmacies. Always check the strain codes on the packaging: they must correspond to the DSM/NCIMB codes listed in the article.
CDS22-formula: The “Certified” De Simone Formulation
CDS22-formula is identical to classic Vivomixx and to Visbiome Vet (recommended for feline CKD in the USA). It contains the exact same 8 strains, including Streptococcus thermophilus, Bifidobacterium breve, B. longum, B. infantis, Lactobacillus acidophilus, L. plantarum, L. paracasei, and L. delbrueckii subsp. bulgaricus.
Visbiome Vet: Identical to CDS22 but Only Available in the USA
Visbiome Vet is the veterinary version of the DSF, marketed in the United States by Exegi Pharma. It contains the same 8 identical strains as CDS22-formula and classic Vivomixx, but in slightly lower concentrations (112.5 billion CFU/capsule or 225 billion/sachet).
It is not authorized in the EU. CDS22-formula offers the same profile with legal availability in Italy.
Ongoing study: The University of Iowa is conducting a placebo-controlled trial to evaluate the reduction of indoxyl sulfate in cats with CKD. Preliminary results (2025) show an average reduction of 25–30%, consistent with human data on the DSF.
💡 OPTIMAL STRATEGY: PROBIOTIC + ADSORBENT The most effective approach for feline CKD combines:
- High-potency probiotic (CDS22-formula for all stages or Vismbiome Vet to reduce bacterial indole production
- Adsorbent (Porus One) to capture residual non-metabolized precursors This “double attack” has shown superior results in preclinical models compared to using either approach alone.
My Practical Protocol by CKD Stage
CKD Stage 1–2 (Creatinine 1.6–2.8 mg/dL)
- Option : CDS22-formula or Visbiome Vet (¼ sachet/day) + inulin 200 mg/day
CKD Stage 3 (Creatinine 2.9–5.0 mg/dL)
- Recommended protocol: CDS22-formula/Visbiome Vet (½ sachet/day) + inulin 300 mg/day + Porus One 500 mg twice daily
- + Porus One 500 mg twice daily for cats with difficulty tolerating high probiotic concentrations
CKD Stage 4 (Creatinine > 5.0 mg/dL)
- Caution: Probiotics alone are not sufficient. Priority goes to subcutaneous fluid therapy and blood pressure management.
- Complementary support: CDS22-formula+Visbiome Vet+ Porus one
Probiotics are support tools, not miracle cures. Optimal CKD management requires an integrated plan including a renal diet, regular monitoring, and pharmacological therapy when necessary. Always consult an experienced veterinarian before starting any supplementation.
Disclaimer: The content is for informational purposes only and cannot under any circumstances constitute a prescription for treatment or replace specialist consultation or direct contact with your veterinarian.
Questions you often ask me (FAQ)
“Can I give the probiotic with food?” To maximize the effect of enteric dialysis, I recommend giving them between meals or with a minimal amount of liquid food/snack. We want bacteria to work on toxins, not get lost in the digestion of the main meal.
“How long do I have to give them for?”
From a naturopathic and CKD support perspective, this is not a “timed” cure, but a new lifestyle. Supporting the intestines to relieve the kidneys is a strategy to be maintained throughout the animal’s life.
Transparency note: This is the sharing of my research path and my experience in the field. Each animal is unique and kidney failure is a complex disease that requires constant veterinary monitoring. Always consult your veterinarian before changing your therapy.
A Holistic Approach to a Better Life – The Gut-Kidney Axis
The management of chronic kidney disease is evolving. It is no longer a question of focusing exclusively on the kidneys, but of adopting a holistic approach that recognizes the intestine as a fundamental partner in the fight against the disease. From enteric dialysis to controlling uremic toxins, supporting gut health is one of the most promising and powerful strategies we have available.
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