Targeted Kidney Support Formulated for Cats
Chronic kidney disease (CKD) is among the most prevalent health concerns affecting senior cats. Studies suggest that CKD impacts up to 30% of cats over the age of 15, and its slow, progressive nature means that by the time clinical signs appear — increased thirst, weight loss, reduced appetite — meaningful kidney function has already been lost. This makes early and consistent nutritional support one of the highest-impact interventions available to cat owners managing feline renal health.
Rx Renal Feline by Rx Vitamins is a comprehensive, hypoallergenic kidney support formula designed specifically for cats. It combines 15 botanical extracts and nutraceuticals with clinical and pharmacological evidence supporting their role in renal function. The formula has been shown to help normalize renal blood values including BUN (blood urea nitrogen), creatinine, and phosphorus in patient trials, with results achievable in as little as two weeks.
Key Ingredients (per 2 capsules)
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Astragalus Root Extract (10:1), 25 mg: Supports glomerular filtration and provides adaptogenic, anti-inflammatory support to renal tissue.
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N-Acetylcysteine, 25 mg: Precursor to glutathione; protects kidney cells from oxidative damage — an important consideration in cats where oxidative stress accelerates CKD progression.
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Rehmannia glutinosa Extract (5:1), 25 mg: Used in Eastern botanical medicine for centuries to support kidney function; emerging evidence supports its nephroprotective and anti-inflammatory activity.
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Rhubarb Extract (5:1), 25 mg: Published veterinary research supports its use in lowering elevated creatinine and BUN levels in patients with renal insufficiency.
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Milk Thistle (80% Silymarin), 25 mg: Silymarin's free radical scavenging action extends protection beyond the liver to renal tubular cells.
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L-Arginine, 25 mg: Nitric oxide precursor that supports healthy renal blood flow and glomerular perfusion.
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Cordyceps Extract, 5 mg: A medicinal mushroom with published evidence of improving kidney function markers in CKD models.
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Melatonin, 0.5 mg: A potent antioxidant with demonstrated nephroprotective effects in animal studies.
Full formula also includes L-Glutamine, Asparagus Root, Dong Quai, Szechuan Lovage Root, Ginkgo Biloba, and Green Tea Extract.
Directions for Use
One capsule per 10 lbs of body weight, twice daily. Capsules can be opened and contents mixed with wet food for easier administration. The formula is hypoallergenic and free from meat additives, suitable for cats with protein sensitivities.
Store at room temperature out of direct sunlight. Results in renal bloodwork values are often seen within 2–4 weeks.
Supplement Advisor's Note
Cats metabolize many compounds differently from dogs, which is why feline-specific dosing in this formula matters. The lower dose per capsule (calibrated at 1 capsule per 10 lbs versus 1 per 25 lbs for dogs) accounts for feline renal clearance differences and avoids oversupplying botanicals that require hepatic metabolism. For cats that resist capsules, opening them and mixing the contents into strong-smelling wet food is effective. The hypoallergenic, no-meat-additive formulation is especially valuable for cats with concurrent protein allergies or on prescription renal diets where ingredient control matters.
Frequently Asked Questions
How is Rx Renal Feline different from Rx Renal Canine?
Both products share similar ingredient profiles but are dosed differently. Rx Renal Feline provides 25 mg of each primary botanical per 2 capsules, dosed at 1 capsule per 10 lbs. Rx Renal Canine provides 100 mg per primary botanical per 2 capsules. Never interchange the formulas — feline dosing is essential to safety and effectiveness.
Can I give Rx Renal Feline to a cat already on a prescription kidney diet?
Yes. This supplement is commonly recommended alongside prescription renal diets, as it works through mechanisms (antioxidant protection, botanical support, improved glomerular flow) that complement dietary phosphorus restriction rather than overlapping with it.
My cat is picky — will she take this?
Capsules can be opened and the contents mixed into wet food. The hypoallergenic, unflavoured formula tends to be better tolerated by picky cats than meat-flavoured supplements that some cats refuse after initial novelty wears off.
How often should my cat's bloodwork be rechecked after starting Rx Renal Feline?
Most veterinarians recommend rechecking kidney panels every 4–8 weeks when starting a new renal supplement, then quarterly once values have stabilized. Improvements in BUN and creatinine may be visible in as little as two weeks.
