Vetoquinol Viralys Gel Immune Supplement for Cats

By Vetoquinol
Rated 4.2841 out of 5 stars

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Top IngredientsArabic Gum, Brewers Yeast, Calcium Propionate...L-Lysine in a palatable base.Active Ingredients: L-Lysine Hydrochloride 500 mg., Inactive Ingredients: Arabic Gum, Brewers Yeast...Active Ingredients: L-Lysine, N, N-Dimethylglycine HCl (D mg)....l-lysine, natural chicken liver flavor, oat flour...
LifestageKitten, Adult, SeniorKitten, Adult, SeniorKitten, Adult, SeniorKitten, Adult, SeniorKitten, Adult, Senior
Health FeatureEye Care, Immune Support, Respiratory CareImmune SupportEye Care, Immune Support, Respiratory CareImmune SupportImmune Support
Food FlavorPoultry, Meat, Chicken, LiverHerbs & Spices, HickoryPoultry, Meat, Chicken, LiverFruits & Vegetables, Chicken
Food FormTreats, SupplementSupplementSupplementSupplementSupplement

About This Item


  • A highly palatable L-Lysine HCI Nutritional supplement for cats that may be given orally twice a day
  • This L-Lysine supplement is specifically developed for cats and kittens in mind
  • A nutritional supplement for conditions responsive to Lysine such as upper respiratory problems or feline herpes virus
  • This oral gel will also help reduce inflammation of the eyes, conjunctivitis (eye discharge), squinting sneezing, sinus congestion, and so much more
  • Made in Canada and manufactured according to rigorous pharmaceutical standards, L-Lysine powder can be safely administered with no known side effects for as long as required

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Nutritional Information

Feeding Instructions


Play Video: Learn More About Vetoquinol From Our Team of Experts
Learn More About Vetoquinol From Our Team of Experts

Trusted Immune System Support

Adding L-lysine as a supplement to your cat's diet is an easy way to help support her long-term health. As a market leader with a wide range of L-lysine products, Vetoquinol puts this active ingredient in tasty chews and bite-size morsels, plus paste, gel and powder form so you can find the best way to offer it to your kitty. These supplements are specifically designed for felines to support the immune system, and maintain respiratory an

Seal of Quality

Out of thousands of animal supplement companies, only a hundred are audited NASC members, including Vetoquinol. That means they've undergone a comprehensive quality audit to earn the NASC Quality Seal. Displaying this seal on their products means that you can rest assured that they are committed to following the highest current standards of quality in the industry.

Enisyl-F & Viralys Products

Specially formulated Enisyl-F was the first lysine-based nutritional supplement developed for veterinary use for kitties. Supplementing with L-lysine is helpful for managing the symptoms of upper respiratory infections in kittens and cats that were strays, and those in shelters.


Veterinarian formulated to deliver just the right dose in a treat with cheese, chicken, liver and hickory smoke flavors.


Tiny mouthfuls of L-lysine disguised as a delicious snack with savory chicken fat and chicken liver.

Oral Paste

Highly palatable paste that can be given by mouth, mixed with food, or even applied to paws for your cat to lick off.

Oral Powder

Delivers L-lysine HCl in a powder with fish and poultry liver flavors that cats crave—just sprinkle it on top of food.

Oral Gel

Cats only need a small amount of this extremely palatable gel to get the benefits of L-lysine HCl.

About Vetoquinol

Vetoquinol is a family-owned company devoted exclusively to finding innovative solutions for animal health issues. They've shown more than 80 years of dedication, researching everything from oral hygiene to urinary and kidney health to create products that are effective and safe for the pets you love and care about. Founded in 1933 with an expertise in pet pain management and veterinary resources, Vetoquinol has gained the continued trust of pet parents and vets worldwide.
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Questions & Answers

17 Customer Questions

Is this Maple Flavor?? The Viralys we've been using is maple flavor and they love it. Don't want to take a chance with a change. Thank you.
Answer by ChewyFeb 27, 2018
This gel is Maple Flavor.

I'm not great with measurements, so if i had a 1 ml syringe, how much of this would i use for an adult cat?
Answer by ChewyNov 02, 2017
For cats over 6 months you'll administer 1.25 milliliters (¼ of a teaspoon) which contains approximately 250 milligrams of L-Lysine. The suggested administration for kittens under 6 months of age is 0.65 milliliters (⅛ of a teaspoon). The doses will be administered twice daily unless specified otherwise by a veterinarian.

Does viralys lose its effectiveness after expiration date?
Answer by ChewyDec 12, 2019
We recommend using the oral gel prior to expiring for the safety of your pet.

Where is product made
Answer by ChewySep 20, 2022
This supplement is made in Canada.

ReviewsWrite a Review

Rated 4.2841 out of 5 stars
623 Ratings
Would recommend to a friend

621 Customer Reviews

Rated 1 out of 5 stars
By Adrienne on Oct 10, 2023


My gal tried once first time couple weeks ago. Will not go near it since. Looks like in elderly age (15.5) she will not be continuing to get the lysine support had the last 13+ years. We finished the last of the VetriScience chews had since early in year and from reviews do not think will waste time with those either. Too bad the entire industry gone downhill.

Rated 5 out of 5 stars
By Yuka on Sep 5, 2023

Viralys exceeded my expectations!

I have two feral cats in my backyard that I care for and one of them showed up coughing. The coughing went on for a few weeks and worried, I did a bit of research then ordered Viralys. I added it to both of their foods, to prevent the other one from getting the cough and within a few weeks the cough was gone. If you have ferals, and there is no way to take them to the vet, this worked like nothing I could imagine. And with the colder months approaching I wanted to make sure they were at their healthiest to take on the New York winters.

Rated 5 out of 5 stars
By Patherndon on Aug 22, 2023

My cat likes it, so I like it!

The doctor recommended Lysine for one of my cats, and I tried with a powder formula first, but this gel is better. It taste maple, and my picky cat likes it. And it is very easy to give it to him, in a plastic spoon.

Rated 5 out of 5 stars
By Peggy on Sep 12, 2023

Vetoquinol Viralys Gel Immune Supplement for Cats

Viralys helps my kitty with sneezing and coughing it gives him the boost he needs. Veterinarian recommended to me.

Rated 5 out of 5 stars
By Leto on Jun 27, 2023


This was recommended by my vet to help with the digestion of my older cats as they were having issues throwing up their food. I just add a dollop to their dishes and so far, once a day works great. IAnd they love the taste. I am sure it makes their gut feel better as well!!!

Rated 5 out of 5 stars
By Catmom on Sep 27, 2023

So far so good

My cat loves the taste of this product and it seems to be helping her eyes and nose.

Rated 5 out of 5 stars
By JonC on Apr 26, 2023

So good my cat thinks it is a treat

This stuff is amazing! My cat licks this stuff right off my finger. No fuss feeding. This is a supplement or medication that my cat doesn’t fight against at all. That maple flavor is something my cat loves! He literally thinks it is a treat, and begs for it morning and night. I feed it to him during the times I give him his treats too. This is good because this is a supplement I recently found out that he needs for his whole life.

Rated 4 out of 5 stars
By metoo on May 7, 2023

they like it

I recently adopted two cats. One has FIV, she/we are managing it. The Vet suggested the kibbles of this...they hated them! I decided to try this form, they both like it. They think it is a treat. Is it working to keep her immunities up? I don't know. But I am willing to continue this product.

Rated 5 out of 5 stars
By Ortiz91822 on Apr 28, 2023

Love this stuff!

This stuff is great I just follow the instructions and put someone his nose and he eats it right up. It seems to be helping with his wheezing and phlegm sounding also. Very happy. His doctor had him on this when he was a kitten from the vets office so I knew it was good.

Rated 3 out of 5 stars
By Sylvia on Apr 25, 2023
Top 500 Contributor

Not really certain

I ordered this for my three cats hoping to boost their immune system. They eat it just fine but I'm not sure about it. One of my cats has a sensitive stomach and the other one has allergies. The third one is kind of normal so I may continue to give the Viralys to the third cat.