Gut-First Kidney Support · made for cats

Kidney care for the cat who runs the house.

A daily powder that catches phosphorus from her food and waste made in her gut, before either one reaches her kidneys. No pills, no wrestling, no drama.

A scoop every meal
Mixes into any food
Shellfish-free
Shop Struts Kidney
30-day money-back guarantee

GOOD FOR

  • Senior cats
  • Early kidney concerns
  • Prevention-minded cat parents
  • Picky eaters
  • Cats who hate pills

Signs your cat's kidneys may need support

Cats hide discomfort better than any animal in the house. These are the quiet signs that show up first:

Drinking more than usual

Drinking more than usual

Extra trips to the water bowl, or a sudden interest in the faucet, is usually the first thing you notice.

Bigger clumps in the litter box

Bigger clumps in the litter box

More pee, more often, and heavier clumps when you scoop.

Pickier at mealtime

Pickier at mealtime

Sniffing and walking away from food they used to love.

Dull coat or slow weight loss

Dull coat or slow weight loss

So gradual you only see it in old photos.

If you're seeing these signs, talk to your vet, and start supporting the kidney filters your cat still has.

Two things wear down her kidneys. Both start in her gut.

Catches phosphorus

Catches phosphorus

Chitosan and calcium carbonate grab extra phosphorus from her food and carry it out in the stool.

Catches gut waste

Catches gut waste

Gut bacteria turn leftover protein into waste her kidneys must filter. Chitosan grabs it, and inulin helps her gut make less.

Supports her kidneys

Supports her kidneys

Omega-3 supports healthy kidney function and blood flow. Vitamin E helps protect her kidney cells from daily wear.

Science-backed phosphorus control

A small daily scoop of plant-based chitosan binds dietary phosphorus in the gut, before it can be absorbed. In a published feline study, the chitosan + calcium carbonate pairing supported normal phosphorus levels within 5 weeks of daily use.*

And the cats didn't change food. They kept eating their normal meals, with the binder mixed in.*

Phosphorus absorbed from the same meal*
lower is better
 
 
−50%+
Struts
No binder
Chitosan + calcium carbonate
Over 50% less phosphorus absorbed, meal after meal*
measured in a published study of the chitosan + calcium carbonate pairing in cats
✓Studied binder ingredients
✓Dosed for cats, not people
✓Works with every meal
✓No lactose · No shellfish
*Wagner et al., 2004; Brown et al., 2008. Results may vary. This product is not intended to diagnose, treat, cure, or prevent any disease.

Nature-derived, science-backed

THREE ACTIONS, NOTHING YOUR CAT DOESN'T NEED.

Plant-Based Chitosan The hero: the two-job binder +

Chitosan is a natural fiber that grabs onto phosphorus in the gut while food digests, then passes through undigested and carries it out in the stool. It also grabs waste her gut bacteria make, so that leaves in the litter box too.

Ours comes from fungi, not shrimp or crab shells, so there is no shellfish in the bottle.

Calcium Carbonate The co-binder +

A simple, well-studied mineral that works alongside chitosan, binding phosphorus during digestion so less of it is absorbed.

Two binders working together, each catching what the other misses.

Omega-3 (EPA & DHA) Support for the filter units that remain +

Cats are born with all the kidney filter units they will ever have. Lost ones never grow back.

Fish-oil omega-3s (EPA and DHA) support healthy kidney function in the filter units your cat still has.

Vitamin E The antioxidant +

An antioxidant that helps protect her kidney cells from the daily wear that comes with age.

The nutrient form, α-tocopheryl succinate, at 12 mg a day.

Bonito & Inulin Flavor and the prebiotic +

Natural bonito flavor: tastes like real bonito tuna, so she eats it without a fight.

Inulin is a prebiotic fiber. It feeds the good bacteria in her gut, so her gut makes less of the waste her kidneys have to clear.

No fillers, no mystery blends. We print the full amount of every ingredient on the label.

A daily supplement for cats. Mix into food at every meal.

What to expect in the first 3 months

Prescription kidney diets only work if your cat will eat them, and most cats walk away from the bowl. Struts goes into the food your cat already loves, at every meal.

Month 1
The routine sets in
The bonito flavor disappears into dinner, and Struts gets to work, catching phosphorus and gut waste at every meal.
Month 2
Support you can see at the bowl
Daily binding supports normal phosphorus levels, and normal hydration and appetite with it.
Month 3
Long-term protection, every meal
By now it's just part of dinner, and every bowl keeps supporting healthy kidney function.

Side by side withthe binder vets sell

Same binder pairing, plus a prebiotic, omega-3 and vitamin E. No lactose base, no shellfish.

Side by side withthe binder vets sell

Same binder pairing, plus a prebiotic, omega-3 and vitamin E. No lactose base, no shellfish.

Struts Kidney
Leading vet-sold binder
Binds phosphorus at every meal
No lactose base
Plant-based, shellfish-free chitosan
Omega-3 (EPA & DHA) included
Natural bonito flavor
Money-back guarantee
Shelf-stable, no refrigeration
Triple-Action Kidney Support Powder
What to expect with Struts Kidney: month 1 phosphorus binding begins, month 2 eating and drinking like herself, month 3 more strut in her step
Struts Kidney vs other kidney supplements: binds phosphorus at every meal, science-backed binder ingredients, picky eater proof, no lactose no shellfish
One daily scoop of Struts Kidney, formulated to support healthy kidney function, normal phosphorus levels, normal hydration, and a healthy appetite
Triple-Action Kidney Support Powder
Struts Kidney in real customer homes
Triple-Action Kidney Support Powder
What to expect with Struts Kidney: month 1 phosphorus binding begins, month 2 eating and drinking like herself, month 3 more strut in her step
Struts Kidney vs other kidney supplements: binds phosphorus at every meal, science-backed binder ingredients, picky eater proof, no lactose no shellfish
One daily scoop of Struts Kidney, formulated to support healthy kidney function, normal phosphorus levels, normal hydration, and a healthy appetite
Triple-Action Kidney Support Powder
Struts Kidney in real customer homes

Triple-Action Kidney Support Powder

Struts Kidney is Gut-First Kidney Support for cats. A scoop in every meal, mixed into food.

Two things wear down her kidneys, and both start in her gut: extra phosphorus from her food, and waste her gut bacteria make. Struts catches both while dinner digests and carries them out in the stool, before either one reaches her kidneys.

  • Plant-based chitosan + calcium carbonate: catch extra phosphorus
  • Chitosan + prebiotic inulin: catch gut-made waste and help her gut make less
  • Omega-3 (EPA/DHA) + vitamin E: support healthy kidney function
  • Real bonito tuna flavor: she eats it without a fight

No lactose, no shellfish, no added sodium.

75 g tub, 60 scoops, scoop included. Shelf-stable. 30-day money-back guarantee.

$39.95 $59.99 SAVE 33%
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Questions cat owners ask

Plain answers about dosing, timing, safety, and refunds.

When will I notice anything? +

The binder starts working at the first meal, but support builds with daily use. In the published study behind our binder pairing, normal phosphorus levels came within 5 weeks. Keep it in every meal.

Do I have to change my cat’s food? +

No. Struts mixes into the food your cat already eats, wet or dry, with no prescription diet to fight over.

What if my cat refuses it? +

We flavor it with real bonito so it vanishes into dinner. If your cat still refuses, that is what the money-back guarantee is for: you get a full refund.

Is it safe for daily, long-term use? +

It is built for exactly that. The binder is not absorbed. It travels through with the food and leaves with the stool. If your cat has a diagnosed condition or takes medication, check with your vet first.

Why a powder instead of a capsule? +

A capsule swallowed at 3pm is not in the gut when dinner digests at 7. Phosphorus gets absorbed while food digests, so the binder has to be there at the same time. A powder mixed into the meal arrives with the meal.

Is the chitosan from shellfish? +

No. Struts uses chitosan grown from fungi, not shrimp or crab: no shellfish allergens.

Does it need refrigeration? +

No. Struts Kidney is shelf-stable. Keep the bottle sealed in a cool, dry cupboard. That's it.

How long does one bottle last? +

One bottle holds 75g, a 30-day supply for one cat. Under 5 kg (11 lb): 1 scoop per meal, twice a day. Over 5 kg: 1.5 scoops per meal. Scoop included.

My cat is healthy. Is this still worth it? +

Yes. Cats are born with every kidney filter unit they will ever have, and lost ones never grow back. A daily binder is how you protect what cannot be replaced.