Felisyl Salmon Flavored Gel Immune Supplement for Cats, 5-oz tube

By Felisyl
Rated 3.6364 out of 5 stars
$16.99Chewy Price
$16.14Autoship Price
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Total Price: $60.94

About This Item


  • Contains 250 mg of L-Lysine per ¼ teaspoon.
  • L-Lysine is an essential amino acid that helps support immune, respiratory and eye health in cats.
  • Provides support for cats with FHV-1 (feline herpesvirus) and frequent respiratory and eye infections.
  • Comes in a palatable salmon-flavored gel you can give directly or mix into food.
  • Made in the USA.

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Nutritional Information

Feeding Instructions


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Top IngredientsActive Ingredient: L-lysine., Inactive Ingredients: Artificial Sweetener, Citric Acid...Water, L-Lysine Monohydrochloride, Stearic Acid...Active Ingredients: L-Lysine Hydrochloride., Inactive Ingredients: Citric Acid, Edetate Disodium...l-lysine, natural chicken liver flavor, oat flour...Active Ingredients: L-Lysine, N, N-Dimethylglycine HCl (D mg)....
LifestageKitten, Adult, SeniorAdultAdultKitten, Adult, SeniorKitten, Adult, Senior
Health FeatureEye Care, Immune Support, Respiratory CareImmune SupportImmune SupportImmune SupportImmune Support
Food FlavorSalmonSalmonFruits & Vegetables, ChickenPoultry, Meat, Chicken, Liver
Food FormSupplementSupplementSupplementSupplementSupplement

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ReviewsWrite a Review

Rated 3.6364 out of 5 stars
22 Ratings
Would recommend to a friend

22 Customer Reviews

Rated 5 out of 5 stars
By SoftyMcPlushness on Aug 5, 2023

Use a syringe…this formula works!

This formula and brand seems to work the best for my big ragdoll Siamese. I used the other brand and it didn’t seem to work. Cats are so fussy! I got a reusable child’s medication syringe and dose him with that. He’s a good boy so he doesn’t fight much and so much easier than throwing expensive wet food away when they refuse it.

Rated 5 out of 5 stars
By David on Aug 16, 2023

In a market flooded with supplements, Felisyl Salmon-Flavored Gel Immune Support stands head and shoulders above the rest. With its delectable flavor, potent immune-boosting properties, and user-friendly design, it's a win-win for both cat owners and their beloved companions.

Rated 5 out of 5 stars
By nancy on Aug 11, 2023

Highly recommend

I recently purchased the Felisyl Salmon-Flavored Gel for my feline, and I'm beyond impressed.

Rated 1 out of 5 stars
By Stephanie on May 24, 2023

Cats wont touch it

NONE of the cats would even try this. I put it in their mouth, on their nose, in their food, nothing. Even the feral cats didnt eat it.

Rated 2 out of 5 stars
By Vicc on Jan 9, 2023

Cats did not like

All three of my cats hated the taste. I was really hoping they would like it after reading all of the positive reviews.

Rated 5 out of 5 stars
By Marilyn on Jan 5, 2023

Cats Need Lysine

Lysine helps to boost a cat's immune system. There is nothing more important to me than the health of my cats.

Rated 4 out of 5 stars
By Monkey415 on Jun 28, 2022

Kitty likes it!

I was happy that my cat took to Felisyl Salmon Flavored Gel Immune Supplement for Cats, my cat had a cold for over a week, and this seemed to give him the boost that he needed to get it out of his system. I fed him the gel right off a spoon.

Rated 5 out of 5 stars
By Boobmcnutt on Mar 24, 2022

Good product & price.

This works great for one of my cats with breathing problems helps her breath better.

Rated 5 out of 5 stars
By CatLady on Jun 19, 2021

It Worked!

One of my foster kittens (at about 5 weeks old) had herpes in one eye, not too bad, but not as open as it should be (i.e. kind of squinty). Lysine gel was recommended as immune support for eyes, along with an antibiotic. The antibiotic stopped it from getting worse, but it wasn't until I started giving her the Lysine gel that her eye opened as it should. She is now a happy, bright-eyed, adopted kitten. She readily ate it, and the mother and other kitten were interested too, so it must be very palatable.

Rated 3 out of 5 stars
By Cclady on Jun 27, 2021

Effective medication

My cats don’t like this flavor. Enjoy other brand. I’m sure it’s effective, but my cats prefer the other brand.