Daily kidney-support powder for cats. Half a teaspoon a day, mixed into food, helps protect the kidneys from the #1 thing that wears them down. It travels through with dinner, grabs phosphorus, and carries it out the back door.
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Try it for a full month. If it does not work out for you and your cat, tell us and we will refund you in full.
THE BINDER VETS SELL, REBUILT CLEAN Chitosan and calcium carbonate, the same pairing as the binder vets sell, with omega-3 added. No lactose, no shellfish.
Owners describe the same six things over and over. Each one traces back to the same place: her kidneys.
You refill it more than you used to, or she's started sitting by the faucet. Kidneys that are losing filter power can't hold water inside her body the way they should. She pees more, so she drinks more to keep up.
Bigger, heavier clumps mean more pee. More pee means her kidneys are letting water pass straight through instead of pulling it back into her body.
You feel her spine when you pet her, even though she finishes her bowl. When waste the kidneys should clear builds up in her blood, her body gets worse at turning food into muscle, so she burns the muscle she already has.
Not fish breath. A sharp smell, almost like ammonia. That smell is waste her kidneys would normally filter out. When it builds up in her blood, you can smell it on her breath.
The same waste that changes her breath also irritates her stomach. The occasional hairball is normal cat stuff. Vomiting that becomes a pattern is not.
A body running low on water pulls it from wherever it can, and skin and coat pay first. She may also groom less because she feels off.
Cats are born with every kidney filter they'll ever have. Filters that wear out are gone for good, and nothing wears them out faster than extra phosphorus, a mineral packed into every meat-based food. Healthy kidneys clear the surplus. Tired kidneys can't, so it stays in the blood and damages more filters, which leaves even less power to clear it. But phosphorus only becomes a problem after it's absorbed. Catch it in the bowl, while dinner is still digesting, and it leaves her body without ever touching her kidneys. That's the entire job this powder was built to do.
Stir a scoop into her meal. It rides along with dinner.
As the meal digests, the binder grabs the phosphorus in her gut and holds on.
The binder can't be digested, so it carries the phosphorus out in her stool. Nothing to filter, no load on the kidneys.
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.*
A plant-based fiber that binds phosphate on contact. Cats can't digest chitosan, and that's the point: it moves through the gut untouched, holding the phosphorus it picked up until both leave in the litter box.
Ours is grown from mushrooms, not made from shrimp shells, so shellfish is off the label completely.
Calcium carbonate binds phosphorus a different way, locking it into a form the gut can't absorb.
Chitosan works across the whole meal; calcium carbonate picks up what slips past. Two binding routes catch more than one.
The binders play defense. EPA and DHA support the working side: healthy kidney function and normal blood flow through the filters still doing their job.
Most binders stop at binding. We didn't see a reason to.
Natural bonito flavor: real fish taste, so it reads as a topper, not a treatment.
Vitamin E keeps the omega-3 fresh without artificial preservatives.
Inulin is the plant-fiber carrier. No lactose anywhere in the formula: the leading vet-sold binder is built on a milk-sugar base, and cats are lactose intolerant. We chose inulin on purpose.
No fillers, no mystery blends.
A daily supplement for cats. Mix into food at every meal.
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.
Built on the binder mechanism vets have trusted for decades. Rebuilt without the lactose, the shellfish, or the mealtime fights.
Built on the binder mechanism vets have trusted for decades. Rebuilt without the lactose, the shellfish, or the mealtime fights.
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Struts Kidney
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Prescription renal diet
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Kidney capsules & drops
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Binds phosphorus at every meal
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Flavor cats come running for
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No pilling, no fights
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No prescription needed
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Cost per month
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$39.99 | Up to $300 | $30–$90 |
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Money-back guarantee
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30 days | None | Varies |
Plain answers about dosing, timing, safety, and refunds.
It rides along with her food and catches dietary phosphorus in her gut before her body can absorb it, so it exits in her stool instead of entering her blood. Less phosphorus getting in means less for her kidneys to deal with.
Mix it into one wet meal daily, or split it over morning and evening top-ups. The binder catches the phosphorus in the food it's mixed into, so put it in the portion she reliably finishes.
The binder can only catch phosphorus while food is digesting. In an empty gut it has nothing to hold on to. That's why this is a powder that travels with her food and not a capsule you give between meals: a capsule at 2pm does nothing for the dinner she eats at 6.
No. It mixes into the food your cat already eats, wet or dry, with no prescription diet to fight over.
The base is real bonito, the dried fish flakes cats lose their minds over, and the powder is fine enough to vanish into wet food. Start with half a scoop mixed in well for the first few days if she's the suspicious type.
Most of what this powder does never shows up where you can see it, because phosphorus that gets caught never gets in. Owners tend to watch the water bowl, the litter clumps, and her appetite over the first month or two, since the formula supports normal hydration and appetite. In the published study on this binder ingredient, cats reached normal phosphorus levels within five weeks (Wagner 2004).
It mixes into any food, including renal diets. Binders grab what's in the gut, so if she takes medications, ask your vet whether to give those at a different meal. Already on a phosphorus binder? Check with your vet before stacking two. The formula was developed with veterinary guidance.
Yes. Phosphorus enters with every meat-based meal she'll ever eat, and kidney care is much easier to start early than to catch up on. The daily dose is designed for long-term use in adult cats.
No lactose, no shellfish (our chitosan is grown from fungi, not shrimp or crab), no vitamin C, no vitamin D, no tryptophan, no added sodium, no phosphate-based additives. Every exclusion is deliberate. The full formula with exact amounts is in the “What's inside every scoop” panel above.
One bottle holds 75g and a 1.25g scoop. Under 8 lbs: 1 scoop per meal, so a bottle lasts 40 to 60 days. 8 to 12 lbs: 1 scoop per meal, 2 meals a day, a 30-day supply. Over 12 lbs: 1.5 scoops per meal, about 20 days, which is what the 2-pack and 3-pack are for. Shelf-stable, no fridge.
Try it for a full month. If you're not happy, email us within 30 days of delivery for a complete refund.