7 Best Supplements for Managing Feline Portosystemic Shunt (PSS) Recommended by Veterinarians

Liver HealthTop PicksMeongsiljang Veterinary Advisory Board

Feline portosystemic shunt (PSS) is a condition in which toxic substances enter the bloodstream due to impaired liver function. Proper management and the right choice of nutritional supplements are key to treatment.

What is Feline Portosystemic Shunt (PSS)?

Anatomical diagram of the feline portosystemic shunt

Feline portosystemic shunt (PSS) is a vascular abnormality in which blood that should flow through the liver bypasses it and enters the systemic circulation directly. As a result, toxic substances such as ammonia are not adequately removed by the liver and accumulate, potentially leading to hepatic encephalopathy (HE). HE can occur in both congenital shunts and acquired liver disease, with ammonia and aromatic amino acids serving as the primary causative factors. Key symptoms include neurological signs such as mental confusion, seizures, lethargy, and behavioral changes, which may be accompanied by gastrointestinal and urinary symptoms, making consistent monitoring by owners essential. Congenital shunts are particularly common in cats, and in these cases, surgical correction such as vascular ligation can improve outcomes. Therefore, early diagnosis and consultation with a veterinarian are crucial, and combining medication, dietary management, and regular check-ups can significantly enhance quality of life.

Selection Criteria: 4 Key Factors for PSS Management Supplements

When selecting a diet or supplements to manage feline portosystemic shunts (PSS), it’s helpful to consider the following factors, as each can influence the management of hepatic encephalopathy.

Appropriate protein management: Rather than strictly limiting protein, it is recommended to provide an adequate amount of high-quality protein (such as plant-based or dairy proteins) within a range that does not trigger symptoms.

Ingredients that reduce ammonia: Lactulose and soluble fiber are broken down by colonic bacteria, which lowers intestinal pH and helps excrete ammonia through feces, thereby reducing its levels.

Inclusion of dietary fiber: Dietary fiber aids in the elimination of nitrogen from the gut, helping to reduce the ammonia burden.

Formulation reviewed by your veterinarian: Because individual needs vary, your veterinarian should adjust the diet and supplements based on your cat’s specific condition and body weight.

A scene of a cat consuming a nutritional supplement for portosystemic shunt.

BEST 1: Gan Anjeong Probiotics Capsules

This product is a capsule-form supplement centered around probiotics. - Gut Environment Regulation: Probiotics are known to help maintain the balance of gut bacteria. However, clinical evidence supporting their efficacy in cats remains limited. - Ammonia Management Support: A key aspect of managing hepatic encephalopathy is reducing ammonia production in the gut, for which lactulose and soluble fiber are commonly used. - Ease of Administration: The capsule format makes administration relatively straightforward, and giving it with meals can help reduce gastrointestinal burden. - Supplementary Use: Supplements alone cannot guarantee therapeutic effects. - Veterinary Consultation Required: For safety, this product must always be used under veterinary diagnosis alongside dietary and medical treatments.

Product image of Liver Support Probiotic Capsules

BEST 2: Low-Protein Liver Protection Liquid

This liver-support supplement is formulated primarily with natural ingredients. - Contains supportive ingredients: The liver-protective effects of the plant-based ingredients in this product have not been sufficiently proven in cats, so please use this product only as a supplementary aid. - Key to ammonia management: The cornerstone of managing hepatic encephalopathy is the use of medications such as lactulose, along with appropriate dietary adjustments. - Consider gastrointestinal health: The formulation, which minimizes unnecessary additives, may help reduce the burden on the gastrointestinal tract. - Protein management: Rather than imposing strict protein restrictions, it is recommended to provide an appropriate amount of high-quality protein. - Consult your veterinarian: If your cat has a decreased appetite, a proper evaluation to determine the underlying cause is necessary. Please do not make judgments on your own and consult your veterinarian.

Low-protein liquid nutritional supplement for cats to support liver health

BEST 3: Natural Ingredient Liver Recovery Powder

This powdered liver-support supplement is formulated primarily with natural ingredients. - Contains supportive ingredients: The liver-protective effects of the plant-based and antioxidant ingredients in this product have not been clearly proven in cats, so use it only as a supplement. - Consider gastrointestinal health: The low-additive formulation may help reduce the burden on the stomach and intestines. - Key to ammonia management: The cornerstone of managing hepatic encephalopathy is reducing ammonia production in the gut, with lactulose and dietary fiber being commonly used for this purpose. - Protein management: Rather than excessively restricting protein, it is better to provide an appropriate amount of high-quality protein. - Veterinary consultation is essential: Before long-term use, be sure to consult your veterinarian to combine this with dietary and medical treatment.

Natural Ingredient Recovery Powder Product

Comparison Table of Products BEST 1–3

Item	BEST 1: Liver Stabilizing Probiotic Capsule	BEST 2: Low-Protein Liver Protection Liquid	BEST 3: Natural Ingredient Liver Recovery Powder
Main Ingredients	Probiotic-focused	Lactulose, etc.	Plant-based ingredient-focused
Form	Capsule	Liquid	Powder
Protein Control	Adequate protein (avoid excessive restriction)	Adequate protein (avoid excessive restriction)	Adequate protein (avoid excessive restriction)
Feeding Convenience	Moderate	High	Moderate
Notes	Supports gut balance; limited data on effects in cats	Recommended alongside diet	Effects of plant ingredients unproven

Compared based on ingredients and form; supplements are an adjunct that does not replace dietary or drug treatment. The key to managing hepatic encephalopathy is appropriate dietary control and medications such as lactulose, and since the choice may vary depending on the cat's condition, always consult your veterinarian.

Precautions: Do Not Overdose

Products with excessive liver-supporting ingredients can actually burden the liver. A veterinarian should determine the appropriate dosage based on your pet's weight and condition. Self-prescribing is strictly prohibited.

Usage Tips: How to Administer to Cats

To get the most out of your cat’s Portosystemic Shunt (PSS) supplement, follow these tips:

Give with meals: Administer with food to minimize gastrointestinal irritation.

Consistent daily dosing: Give the supplement 1–2 times per day at the same times to maintain consistency.

Offer water: If using a liquid or powder form, mixing it with water can make it easier for your cat to consume.

Monitor for reactions: If you notice any unusual signs such as changes in mood or decreased appetite, contact your veterinarian immediately.

Tips for Providing Water When Giving Your Cat Supplements

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

When should I start managing PSS?

It’s best to begin dietary and medication management right after your veterinarian’s diagnosis. Early intervention can significantly impact the prognosis.

Will giving supplements completely eliminate the symptoms?

Supplements alone won’t cure the condition. Congenital shunts can be improved with surgical correction, and symptoms can be managed through medication and dietary care. Please consult your veterinarian.

Can this be taken with other medications?

Make sure to have your veterinarian confirm that the medications can be safely used together before administering them concurrently. Some drugs may be contraindicated or interact adversely in cases of liver disease.

Will the symptoms return if I stop the treatment?

If the underlying cause, a short circuit, isn't corrected, symptoms may recur when management is stopped. Consistent care is essential.

Can it be managed through diet?

Dietary management is key to managing PSS. A liver prescription diet that provides high-quality protein without excessive restriction is recommended. Following a veterinarian-prescribed diet is safer than an arbitrary diet.

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References

[1] Fowler, L.B., C.M. Johannes, A. O’Connor, et al. 2020. Ecological level analysis of primary lung tumors in dogs and cats and environmental radon activity. J Vet Intern Med 34(6):2660–2670.

[2] The Cat, Clinical Medicine and Management, 2nd Edition. 2004. Polizopoulou ZS, Koutinas AF, Souftas VD, et al. Diagnostic correlation of CT-MRI and histopathology in 10 dogs with brain neoplasms.

[3] Small Animal Critical Care Medicine, 3rd Ed. 2005. Nasopharyngeal Stenosis. Diagnosis is usually made based on historical information, oropharyngeal examination with palpation of the soft palate, otoscopy, retroflexed rhinoscopy, radiographs, CT, and/or magnetic resonance imaging.