Vetoquinol Viralys Gel Immune Supplement for Cats

By Vetoquinol
Rated 4.2841 out of 5 stars

Product Form:

Selected: Product Form:

Product Form:

Selected: Product Form:


Selected: Size:


Selected: Size:

$22.99 Chewy Price
Or save an extra 5% with
$21.84Autoship Price

Why Autoship?

  • Save 5% on all future Autoship orders
  • Set your schedule based on your pet's needs
  • No fees, no commitments - skip, change or cancel anytime.
Temporarily Out of Stock
Get notified when this item is back in stock.

Compare Similar Items

Customer Rating
Rated 3.5988 out of 5 stars
Rated 4.6027 out of 5 stars
Rated 4.25 out of 5 stars
Rated 3.8861 out of 5 stars
Rated 3.8801 out of 5 stars
$28.99Chewy Price
$28.99Chewy Price
$16.44Chewy Price
$13.99Chewy Price
$17.34Chewy Price
$27.54Chewy Price
$27.54Chewy Price
$15.62Chewy Price
$13.29Chewy Price
$16.47Chewy Price
Top IngredientsArabic Gum, Brewers Yeast, Calcium Propionate...Active Ingredients per 1 scoop (0.52 grams): L-Lysine Hydrochloride ..... 500 mg Inactive Ingredients: Brewer's Dried Yeast, Hydrolyzed Fish (enzymatic), Hydrolyzed Poultry Liver (enzymatic)...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)....
LifestageKitten, Adult, SeniorKitten, Adult, SeniorKitten, Adult, SeniorKitten, Adult, SeniorKitten, Adult, Senior
Health FeatureEye Care, Immune Support, Respiratory CareEye Care, Immune Support, Respiratory CareImmune SupportEye Care, Immune Support, Respiratory CareImmune Support
Food FlavorPoultry, Meat, Chicken, LiverChicken, --Herbs & Spices, HickoryPoultry, Meat, Chicken, Liver
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

See More

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.
Shop Vetoquinol

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