Vetoquinol Viralys Powder Immune Supplement for Cats, 3.5-oz
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About This Item
Details
- A highly palatable L-Lysine HCI Nutritional oral powder for cats that may be sprinkled over dry food or mixed with a small amount of canned food.
- For cats and kittens as a nutritional supplement for conditions responsive to Lysine such as upper respiratory problems or feline herpes.
- This powder will also help reduce inflammation of the eyes, conjunctivitis (eye discharge), squinting sneezing, sinus congestion, and so much more.
- This L-Lysine supplement is specifically developed for cats and kittens and contains naturally occurring amino acids.
- Manufactured according to rigorous pharmaceutical standards, L-Lysine powder can be safely administered with no known side effects for as long as required.
Ingredient Information
Instructions
FAQ
Vetoquinol Viralys
Viralys L-Lysine Supplement for Cats
Support your cat’s immune system with Viralys L-lysine supplement! The key ingredient, lysine, supports normal eye health, respiratory health, and helps your cat maintain a strong immune system
Viralys can help cats manage conditions responsive to lysine, including:
• Squinting, watery, red, and/or itchy eyes
• Sneezing
• Runny nose
• Congestion
For Cats and Kittens
Viralys can be given to cats and kittens of any age to support a healthy immune system.
Maintain Eye Health Support
L-lysine helps support normal eye function and health in cats and kittens.
Respiratory Health
Viralys is formulated to support respiratory health in cats and kittens.
Easy to Give
Even picky cats love the tasty maple-flavored oral gel or fish and poultry-flavored powder!
Satisfaction Guarantee
The makers of Vetoquinol are so sure your pet will like their products that they come with a 100% satisfaction guarantee.
Also Try Enisyl-F!
From Vetoquinol, Enisyl-F L-lysine supplement helps support immune health in cats and kittens of all ages.
Cats love the tasty chicken liver flavor of the easy-to-give bites or the tuna-flavored oral paste - giving you more options for high-quality immune support.
About Vetoquinol
Vetoquinol believes that a healthy pet is a happy pet. That’s why they are committed to creating uniquely formulated products that are easy to administer and designed to foster good health at every life stage. Since 1933, this independent family business has been on a mission dedicated exclusively to animal health. Their goal every day is to enrich the lives of pet parents by helping their pets be well and thrive!
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36 Customer Questions
I only feed the neighborhood cats once daily, so can I double the dosage to do this?
Would it matter if 2 scoops are given once a day verses 1 scoop 2x day?
Is there any difference between L-Lysine and L-Lysine HCL. We have been giving our cat L-Lysince, but I see that Chewy only has L-Lysine HCL.
Towards the end of the Viralys, there is tan/brown powder. Is this safe to use or should I throw it out?
Customers Mention
Ease of Use
Effectiveness
Ingredients
Long-Term Benefits
1036 Customer Reviews
No more sneezes!!
When I adopted my two Maine Coon babies and brought them home, they sneezes all the time! I called the shelter and asked how do you guys stop kitty sneezing? They
When I adopted my two Maine Coon babies and brought them home, they sneezes all the time! I called the shelter and asked how do you guys stop kitty sneezing? They told me they use Viralys powder on all the kittens. I bought the immune powder and put a tiny ( it comes with a tiny spoon) bit on their wet food and I was amazed all the sneezes stopped! They do not notice it in their food. I will use this powder throughout their life. The powder is a little expensive but it lasts nearly a year for 2 cats! To me its a bargain!
Thrilled at the speed of effectiveness and ease of use.
Hello! My cat’s eyes cleared up in a matter of 2-3 days using this as directed. I am so thrilled. Hopper (orange cat) regularly had a discharge in one eye that compelled
Hello! My cat’s eyes cleared up in a matter of 2-3 days using this as directed. I am so thrilled. Hopper (orange cat) regularly had a discharge in one eye that compelled me to clean that inside corner more than once a day. It seemed to be getting worse so I tried this. I only wish I had gotten it sooner. I mixed this into her wet food and there was no hesitation. That was my greatest concern because she is so fussy and has turned down other forms of this supplement before. I am continuing its use until I finish this one supply. Hopefully, it does not have to be ongoing, but we shall see.
Takes time, but it really works
TLDR: My vet recommended this. I was skeptical, but I'm seeing great results. Results started after 1 month of use. I mix it with a little water then pour it over
TLDR: My vet recommended this. I was skeptical, but I'm seeing great results. Results started after 1 month of use. I mix it with a little water then pour it over my cat's dry food, and he eats it right up. They have non-powder versions, but I haven't tried them. This is the cheaper version, and it works great for us. Background: I found a stray with a terrible upper respiratory infection. Over the course of the first year, he probably had 5 rounds of antibiotics interspersed with probiotics, and would get better only temporarily. While he was sedated for neutering, they even investigated for polyps, but we found no reason for him to be so perpetually snotty. This took about a month for me to see any difference, but around 6 weeks in, he was steady with no snot (finally!). I notice on days when I forget to give it to him, bc his breathing gets heavy and sneezy again. The vet says this is part of his regular diet now for the rest of his life, but it's so worth it!
Great for feline herpes
I got a rescue kitten who was eventually diagnosed with having herpes, which made her eyes constantly inflamed, itchy, and caked in crust. Even after six months
I got a rescue kitten who was eventually diagnosed with having herpes, which made her eyes constantly inflamed, itchy, and caked in crust. Even after six months of good food and care, her eyes were still gunky and would have to be cleaned at least once a day to keep her eyelashes from getting stuck together. The gel viralys worked pretty well and she liked the taste, but the powder allows more consistent dosing. The day after her first two doses, her eyes were clear and the tissue wasn't red. I can also tell she feels a lot better, and it's worth the price considering how long it will last.
Boosts Immune System
I add this to my cats at least once a day (instructions say a scoop twice a day but I can’t afford that frequently at this time). One of my cats especially has a
I add this to my cats at least once a day (instructions say a scoop twice a day but I can’t afford that frequently at this time). One of my cats especially has a recurring cat herpes that always messes with her eyes and nose. This seems to be helping clear her up! I also have another cat who suffers from a chronic case of the calicivirus and since taking this he hasn’t had any tongue ulcers.
Seems to Help!
Undiagnosed cat herpes but he has all the symptoms everyone talks about. Nasal discharge is the worst. I've been giving him a scoopful In his wet food 1/day, just
Undiagnosed cat herpes but he has all the symptoms everyone talks about. Nasal discharge is the worst. I've been giving him a scoopful In his wet food 1/day, just to try it out. He eats it just fine but my other cats do, too. I'm going to get the gel to try & be sure he gets the full dose but It seems to be helping. I wish I could thank the person whose review convinced me to try it.
Works Great!
I just adopted my 1yo cat Dec.2025. She had a hoarse almost non-existent meow. She also had a gooey right eye and bouts of coughing. I took her to the vet. The
I just adopted my 1yo cat Dec.2025. She had a hoarse almost non-existent meow. She also had a gooey right eye and bouts of coughing. I took her to the vet. The vet said her eye issue is herpes. She then treated her cough with antibiotics and steroids. But in my research I found that herpes in cats can cause sore/hoarse throats, respiratory infections and ulcerations of the eye ball. L-lysine suppresses the herpes virus. Once I added this to her food, her eye completely cleared, her sore throat and cough also cleared. Though steroid did help. I believe her sore throat/cough was also herpes related. Now she is feeling much better but has to stay on L-lysine to keep it away. Great stuff!!
Vet Recommended
This was recommended by my vet after a surprise visit due to my cat coming down with the Feline cold (sneezing, coughing, lethargic, etc). I was directed to administer
This was recommended by my vet after a surprise visit due to my cat coming down with the Feline cold (sneezing, coughing, lethargic, etc). I was directed to administer one scoop twice a day in her food. My cat eats wet food so this has been very easy, with no fuss from her. Chewy’s price is significantly cheaper than my vets pricing, which I truly appreciate. I would purchase this product from Chewy if needed agin. My cat has been on this supplement for over two weeks, going on three. Over this time, her symptoms have slowly subsided but have not completely gone away. I will continue the supplement, as they do provide relief, but may ask my vet for something different if her symptoms do not completely clear.
- Wrigley
Used since they were kittens
All three cats had respiratory issues when kittens. Vet suggested using this and I have continued. Just like me taking a vitamin, I’m trying to protect them from
All three cats had respiratory issues when kittens. Vet suggested using this and I have continued. Just like me taking a vitamin, I’m trying to protect them from any problems. They are all 10 years old this year and doing great.
Totally works!
I took my kitties to the vet as they all had symptoms of a uri. Sneezing, lethargic and watery eyes. My veterinarian determined it was not something that needed
I took my kitties to the vet as they all had symptoms of a uri. Sneezing, lethargic and watery eyes. My veterinarian determined it was not something that needed to be treated with antibiotics. A simple kitty cold and suggested this immune booster. Sprinkled on their wet food.They took it easily and their symptoms cleared with 14 days of the Lysene.