Pet Protect Vet-Formulated Endurosyn Probiotic Balance+ Chicken & Fish Flavored Oral Gel for Cats, 15-g syringe

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About This Item

Details

  • Unique, patented palatable oral gel supplement containing amino acids, electrolytes, vitamins, fatty acids, and lactic acid bacteria
  • Comprehensive blend of concentrated energy sources, electrolytes and synbiotics that help restore your cat's proper digestive function following the sudden onset of digestive imbalances.
  • Easy to dose gel is delicious and full of nutrients that your cat may need during stressful situations in order to support immune system, digestive system, and overall health
  • Lactic acid bacteria supports a normal digestive system
  • Great to use during times of stress, including traveling and trips to the vet

Ingredient Information

Instructions

FAQ

Learn More About Pet Protect From Our Team of Experts

Vet-formulated Pet Supplements

Pet Protect offers a variety of supplements for dogs and cats. Whether your pet needs support for joint health, digestive health, skin health, seasonal allergies, stress, or everyday health and wellness, Pet Protect has their back.

Probiotic Balance+ for Dogs & Cats

Pet Protect Probiotic+ oral gel features vet-formulated Endurosyn—a proprietary blend of prebiotics and probiotics, electrolytes, triglycerides and amino acids—to promote microbial balance and intestinal wellbeing. Available for both cats and dogs.

NASC Quality Seal

Every Pet Protect product is backed by the National Animal Supplement Council (NASC), a trusted industry group that upholds the highest standards for quality and safety. Only brands that meet their strict requirements earn the NASC Quality Seal.

Proprietary Blends Backed by Science

Pet Protect proprietary blends are more than just combinations of ingredients; they're the result of veterinary expertise and scientific research. Each formula is designed to target your pet’s specific needs with effective, high-quality ingredients.

About Pet Protect

From the makers of Advantage—a trusted leader in pet health for 25 years—Pet Protect supplements are designed to support your pet’s healthy, active lifestyle. Made in the USA with globally sourced ingredients, each product reflects a commitment to quality.

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Questions & Answers

1 Customer Questions


My cat has renal failure, would this be helpful for him to stay hydrated?

Answer by ChewyMar 13, 2018
This easy to dose gel is delicious and full of nutrients that your cat may need during stressful situations in order to support immune system, digestive system, and overall health. Due to your pet's diagnosed medical condition, we encourage you to speak with your vet before use of this product.
4.1
Rated 4.1 out of 5 stars
50 Ratings

Customers Mention

Chewy identifies key considerations with the help of artificial intelligence and our veterinarians.

Additional Ingredients

85% Positive

Form

80% Positive

Potency

85% Positive

Probiotic Strains

84% Positive

27 Customer Reviews



Rated 5 out of 5 stars
By Karen on Sep 24, 2017

Lifesaver for my Itsy!!!

This medicine was recommended by my vet when my cat was 10 years old. She was near death due to stomach issues. This medicine saved her life. She loved the taste

This medicine was recommended by my vet when my cat was 10 years old. She was near death due to stomach issues. This medicine saved her life. She loved the taste and licks it off the back of my hand. She is now 13 and going strong!! Chewy price is soooo much better than my vet and it is at my door in 2 days or less. Thank you Chewy!!!

By Karen on Sep 24, 2017

Rated 5 out of 5 stars
By Jennifer on Sep 29, 2021

Seems to be helping

My 7 year old cat was recently diagnosed with colitis. Our vet recommended Endurosyn for 3 days and it did help. But after that, her stools were all liquid again

My 7 year old cat was recently diagnosed with colitis. Our vet recommended Endurosyn for 3 days and it did help. But after that, her stools were all liquid again. So, we did another 3 day dose and the same thing happened. Per our vet, we're going to try giving her a little every day (1-2 grams) and see how it goes. I'm hopeful this does the trick because when she was taking it it was working.

By Jennifer on Sep 29, 2021

Rated 5 out of 5 stars
By Amanda on Feb 11, 2021

So far, so good!

After a recent trip to the vet, my 3 year old cat, Biscuit, was diagnosed as having a sensitive stomach, and our vet recommended changing to a dry food that’s targeted

After a recent trip to the vet, my 3 year old cat, Biscuit, was diagnosed as having a sensitive stomach, and our vet recommended changing to a dry food that’s targeted to help this condition. Biscuit had very loose stools (which can be a nightmare to scoop from a litter box), and could stink up our entire house within 60 seconds. I know other cat owners have dealt with the same problem! YUCK! We have 20 indoor cats, which makes it challenging to feed one cat a special diet. My vet recommended trying Endurosyn with Biscuit. First, he LOVES it! That’s always half of the battle....getting your pet to actually eat/take any form of medicine or supplement. We call it “peanut butter,” because it looks just like peanut butter. I squirt the dose into a spoon and hold it out for him to eat, and he loves every last bit of it! Most importantly, it’s working! His stools aren’t as loose, and that’s always a great thing! Thus far, I’m very pleased with Endurosyn and plan to incorporate into his diet on a regular basis! I absolutely recommend Endurosyn to other pet owners who are struggling with their pets’ sensitive stomachs and the effects on their stools. Biscuit is happy, which makes Mama happy....a win, win!!

By Amanda on Feb 11, 2021

Rated 1 out of 5 stars
By Danielle on Apr 9, 2026
Finn
Finn

HE HATED IT!

So my finicky cat had a bad stomach and we went to the vet who gave him a prescription probiotic....although he was not thrilled with me having to squirt it in his

So my finicky cat had a bad stomach and we went to the vet who gave him a prescription probiotic....although he was not thrilled with me having to squirt it in his mouth, he actually enjoyed it. Three days of probiotic for $65....dang. A couple of months later it seemed to be starting again, found this on Chewy thinking same benefits, better price and no office visit....I swear he literally SPIT IT OUT...far and messy and gross smelling. So this was a one and done, never to be used again (found out my cat is chicken sensitive by trial and error and A LOT of reading to those of you wondering). Thankfully his stomach issues seem to be fully resolved on a chicken free limited ingredient diet. Sorry to say this did not do much but cost me some money and a lot of clean up.

By Danielle on Apr 9, 2026
Finn
Finn

Rated 5 out of 5 stars
By Vanessa on Nov 20, 2025
Genghis
Genghis

Works same day-essential

My doc recommended for my feral rescue kitten for diarrhea. We had him dewormed and his poop was runny and smelt like he had a demon and his demon friends inside

My doc recommended for my feral rescue kitten for diarrhea. We had him dewormed and his poop was runny and smelt like he had a demon and his demon friends inside him. After one day, the diarrhea was gone and the demons left, but return every once in a while. Great product.

By Vanessa on Nov 20, 2025
Genghis
Genghis

Rated 5 out of 5 stars
By Indigo on Apr 19, 2019

Got my CKD cat eating again!

My 17yo cat stopped eating from a UTI and I was still having trouble getting him to eat once it cleared up. His tummy would even get rumbly sometimes, so one day

My 17yo cat stopped eating from a UTI and I was still having trouble getting him to eat once it cleared up. His tummy would even get rumbly sometimes, so one day I decided to try giving him my other cat’s Endurosyn (she has IBD and it helps flare-ups). It was amazing—two days of the Endurosyn and I was finally able to get him eating a little hand-fed dry (kitten) food. After about a week I got him back on canned food. This was even more impressive because I just found out he has CKD, which causes nausea and inappetence. I always keep a tube on hand, now!

By Indigo on Apr 19, 2019

Rated 2 out of 5 stars
By Deborah on Feb 15, 2026
Top 100 Contributor
Cooper
Cooper

Only for short term use

Tried to get my Cooper to take. Tried putting it in his food and he refused to eat all day. The tried to give it directly and he threw it right back up. So I just

Tried to get my Cooper to take. Tried putting it in his food and he refused to eat all day. The tried to give it directly and he threw it right back up. So I just threw it away. Wish it came in smaller dose for cats. 5cc is a lot to try to get into a cat especially as thick as it is.

By Deborah on Feb 15, 2026
Top 100 Contributor
Cooper
Cooper

Rated 5 out of 5 stars
By Laree on Oct 17, 2024

It worked

We adopted a young male cat from the shelter who had bad diarrhea- no worms, etc. The probiotic was easy to give and cleared up his system very quickly. Now

We adopted a young male cat from the shelter who had bad diarrhea- no worms, etc. The probiotic was easy to give and cleared up his system very quickly. Now he's able to gain some weight, which he needed, and seems happier.

By Laree on Oct 17, 2024

Rated 5 out of 5 stars
By NancyPS on Mar 22, 2017

Product works great

This product worked wonderfully for my cat with diarrhea. My vet suggested it once before, so when I saw it here, I ordered more to have on hand should any of my

This product worked wonderfully for my cat with diarrhea. My vet suggested it once before, so when I saw it here, I ordered more to have on hand should any of my other cats have gastrointestinal upset. It was the least expensive here as well.

By NancyPS on Mar 22, 2017

Rated 4 out of 5 stars
By Amanda on Nov 14, 2016

My cats like the taste

I have foster kitties. I bought this for diarrhea while they took other meds. It didn't help with that part, most likely its another problem. My cats liked the taste

I have foster kitties. I bought this for diarrhea while they took other meds. It didn't help with that part, most likely its another problem. My cats liked the taste so I didn't have to struggle giving it to them. I would purchase again.

By Amanda on Nov 14, 2016