---
product_id: 49522471
title: "L-Lysine Gel for Cats & Kittens (5oz) – Immune System, Respiratory & Eye Health Support. Reduces Sneezing, Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement – Made in USA (1 Pack)"
brand: "felisyl"
price: "$40.08"
currency: USD
in_stock: true
reviews_count: 8
category: "Felisyl"
url: https://www.desertcart.us/products/49522471-l-lysine-gel-for-cats-and-kittens-5oz-immune-system
store_origin: US
region: United States of America
---

# Salmon-flavored gel for easy dosing 1000mg L-Lysine Monohydrochloride NASC-certified, made in USA quality L-Lysine Gel for Cats & Kittens (5oz) – Immune System, Respiratory & Eye Health Support. Reduces Sneezing, Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement – Made in USA (1 Pack)

**Brand:** felisyl
**Price:** $40.08
**Availability:** ✅ In Stock

## Summary

> 🐾 Keep your cat’s health purrfectly on point with Felisyl!

## Quick Answers

- **What is this?** L-Lysine Gel for Cats & Kittens (5oz) – Immune System, Respiratory & Eye Health Support. Reduces Sneezing, Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement – Made in USA (1 Pack) by felisyl
- **How much does it cost?** $40.08 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/49522471-l-lysine-gel-for-cats-and-kittens-5oz-immune-system)

## Best For

- felisyl enthusiasts

## Why This Product

- Trusted felisyl brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Picky Eater Approved:** Smooth, tasty salmon-flavored gel cats love—no more pill battles or stress.
- • **Breathe & See Clearly:** Reduces sneezing, runny nose, and watery eyes for optimal respiratory and eye comfort.
- • **Quality You Can Count On:** Manufactured under strict NASC standards in the USA for purity, safety, and consistency.
- • **Vet-Formulated & Trusted:** Created by veterinarians for safe, daily use in kittens through seniors with proven results.
- • **Immune Boosting Powerhouse:** Premium L-Lysine supports strong immunity and healthy antibody levels to keep your cat thriving.

## Overview

Felisyl L-Lysine Gel is a vet-formulated, NASC-certified daily supplement delivering 1000mg of L-Lysine in a tasty salmon-flavored gel. Designed to support immune function, ease respiratory symptoms, and promote eye health in cats and kittens, it offers a stress-free dosing experience and is proudly made in the USA.

## Description

Felisyl L-lysine Immune System Support Gel is a product designed to support the immune system of cats. L-lysine is an essential amino acid that plays a crucial role in various biological functions, including immune system function. L-lysine is known to inhibit the replication of the feline herpesvirus, which is a common viral infection in cats that can cause respiratory and eye symptoms. Felisyl L-lysine Immune System Support Gel is a product designed to support the immune system of cats. L-lysine is an essential amino acid that plays a crucial role in various biological functions, including immune system function. L-lysine is known to inhibit the replication of the feline herpesvirus, which is a common viral infection in cats that can cause respiratory and eye symptoms. Immune System Support for Cats Visit the Store Immune System Support for Cats Visit the Store Quality You Can Trust The seal is an indicator that the product was made by a reputable company that is committed to transparency & ethical practices. Quality You Can Trust The seal is an indicator that the product was made by a reputable company that is committed to transparency & ethical practices.

Review: So Far So Good. Kitty Approved! - So far, I am pleased with this Lysine gel for my Ragdoll Kitty. I got it because my kitty was suffering from red, irritated eyes with an occasional sniffle / sneeze. I decided to try and treat this internally rather than dealing with eye drops for this problem in her eyes since it would cause her stress and it is topical so the problem would probably continue without keeping that daily regimen up. I needed something systemic and more favorable to my kitty and she is treats and food driven. I was concerned a bit with some of the reviews dealing with quality control and I am happy to say that all is perfect. It smells great, and my cat loves it. She goes for it with the gusto of eating a Churu. She has only had several doses, but I can already see improvement in the redness in the whites of her eyes. I am so happy. Happy cat, happy life. I started on the minimum dose of 1/8th tsp twice a day and I wait to give it to her on a full stomach to avoid some of the digestive upset that can occur as a side effect. The amount you get in the tube is very affordable compared to others in oral drops or other powders and gels that are super expensive on dosing average. I also felt confident to purchase Felisyl due to it receiving the seal of approval from the NASC and believe it or not, during my research of Lysine products, it is even recognized under Good RX for its health benefits and prevention maintenance for my beloved feline along with several other vet formulated lysine products, but they were double to triple the purchase price. Very happy with my decision and hoping she continues to improve in her health, allergies and keeping her immune system well and strong. This product is so much cheaper than a Vet bill or repeat visits because the symptoms are only treated instead of trying to clear the underlying condition that this gel or more like a paste actually does for her internally and systemically. Allergies begone.
Review: Great for FeLV+ cats! - We have 2 cats with feline leukemia and started giving them this 2x/day. I have picky cats so its hard to find something they will actually eat but they love this! I have seen improvement in my cats eye drainage and sneezing! Will be repurchasing.

## Features

- Immune System Support with L-Lysine – Powered by premium L-Lysine for cats, an essential amino acid that supports immune function and helps maintain healthy antibody levels. Ideal for cats and kittens prone to feline herpes virus (FHV-1) flare-ups, seasonal stress, or general immune challenges.
- Respiratory & Eye Health Relief – Helps ease cat sneezing, runny nose, congestion, and watery eyes associated with common upper respiratory issues in cats. Supports clear breathing, eye comfort, and overall wellness—perfect for cats needing gentle respiratory support or allergy relief.
- Tasty, Easy-to-Give Lysine Gel for Cats – A smooth, salmon-flavored lysine gel for cats that most cats lick up willingly. No more pill struggles—just place the gel on your cat’s paw, nose, or dish for effortless daily dosing. Great for picky eaters and kittens.
- Vet-Formulated & Recommended – Created by veterinarians to deliver targeted immune, respiratory, and eye health support in a highly bioavailable L-Lysine gel for cats. Safe for daily use in kittens, adults, and senior cats. Trusted by pet parents and designed for real results.
- NASC Certified Quality – Made in the USA – Manufactured under rigorous NASC standards for purity and safety. This high-quality cat lysine gel is proudly made in the USA, ensuring consistency and peace of mind with every dose.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00MO9SHBE |
| Active Ingredients | L-Lysine Monohydrochloride |
| Allergen Information | Codfish Free |
| Best Sellers Rank | #2,261 in Pet Supplies ( See Top 100 in Pet Supplies ) #11 in Cat Supplements & Vitamins |
| Brand | Felisyl |
| Brand Name | Felisyl |
| Customer Reviews | 4.4 out of 5 stars 2,135 Reviews |
| Flavor | Gel (5 oz.) |
| Global Trade Identification Number | 00814087006547 |
| Included Components | 1 |
| Item Form | Gel |
| Item Type Name | Felisyl L-Lysine Gel for Cats - Immune System Support - Supplement Support for Healthy Tissue, Respiratory, and Vision - Salmon-Flavored - Made in the USA - 5 oz |
| Item Volume | 5 Fluid Ounces |
| Manufacturer | Pet Health Solutions / HealthyPets, Inc. / Sogeval |
| Manufacturer Part Number | FEL6547 |
| Model Number | FEL6547 |
| Number of Items | 1 |
| Pet Type | Cat |
| Product Benefits | Aids Respiratory & Eye Health - Helps reduce the frequency and severity of respiratory discomfort, sneezing, runny nose, and watery eyes associated with environmental stressors., Eases Upper Respiratory Symptoms - Promotes normal respiratory tract function, making it ideal for cats prone to congestion, nasal discharge, or seasonal flare-ups., Helps Manage Stress-Related Flares - Supports a healthy immune response during stressful events like boarding, vet visits, moving, or changes in routine., High-Palatability Salmon Flavor - Smooth and tasty gel makes daily dosing easy—great for picky eaters who dislike powders or chews., Ideal for Kittens & Adult Cats - Safe and gentle enough for kittens while providing effective daily support for adult and senior cats., Supports Strong Immune Function - Delivers a daily dose of L-Lysine, an essential amino acid that helps maintain normal immune defenses and keep cats healthier year-round. Product Benefits Aids Respiratory & Eye Health - Helps reduce the frequency and severity of respiratory discomfort, sneezing, runny nose, and watery eyes associated with environmental stressors., Eases Upper Respiratory Symptoms - Promotes normal respiratory tract function, making it ideal for cats prone to congestion, nasal discharge, or seasonal flare-ups., Helps Manage Stress-Related Flares - Supports a healthy immune response during stressful events like boarding, vet visits, moving, or changes in routine., High-Palatability Salmon Flavor - Smooth and tasty gel makes daily dosing easy—great for picky eaters who dislike powders or chews., Ideal for Kittens & Adult Cats - Safe and gentle enough for kittens while providing effective daily support for adult and senior cats., Supports Strong Immune Function - Delivers a daily dose of L-Lysine, an essential amino acid that helps maintain normal immune defenses and keep cats healthier year-round. See more |
| Specific Uses For Product | Active |
| Target Species | Cat |
| UPC | 814087006547 |
| Unit Count | 1.00 Count |
| Vitamins And Minerals | 1000 Milligrams |
| Volume | 5 Fluid Ounces |
| Warranty Description | 1 Month |

## Product Details

- **Active Ingredients:** L-Lysine Monohydrochloride
- **Brand:** Felisyl
- **Flavor:** Gel (5 oz.)
- **Item Form:** Gel

## Images

![L-Lysine Gel for Cats & Kittens (5oz) – Immune System, Respiratory & Eye Health Support. Reduces Sneezing, Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement – Made in USA (1 Pack) - Image 1](https://m.media-amazon.com/images/I/61B+fxs0M+L.jpg)
![L-Lysine Gel for Cats & Kittens (5oz) – Immune System, Respiratory & Eye Health Support. Reduces Sneezing, Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement – Made in USA (1 Pack) - Image 2](https://m.media-amazon.com/images/I/71BFax6e6YL.jpg)
![L-Lysine Gel for Cats & Kittens (5oz) – Immune System, Respiratory & Eye Health Support. Reduces Sneezing, Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement – Made in USA (1 Pack) - Image 3](https://m.media-amazon.com/images/I/712QUdjt9zL.jpg)
![L-Lysine Gel for Cats & Kittens (5oz) – Immune System, Respiratory & Eye Health Support. Reduces Sneezing, Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement – Made in USA (1 Pack) - Image 4](https://m.media-amazon.com/images/I/71DIKuT0rQL.jpg)
![L-Lysine Gel for Cats & Kittens (5oz) – Immune System, Respiratory & Eye Health Support. Reduces Sneezing, Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement – Made in USA (1 Pack) - Image 5](https://m.media-amazon.com/images/I/810SVO3WONL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ So Far So Good. Kitty Approved!
*by K***E on January 5, 2026*

So far, I am pleased with this Lysine gel for my Ragdoll Kitty. I got it because my kitty was suffering from red, irritated eyes with an occasional sniffle / sneeze. I decided to try and treat this internally rather than dealing with eye drops for this problem in her eyes since it would cause her stress and it is topical so the problem would probably continue without keeping that daily regimen up. I needed something systemic and more favorable to my kitty and she is treats and food driven. I was concerned a bit with some of the reviews dealing with quality control and I am happy to say that all is perfect. It smells great, and my cat loves it. She goes for it with the gusto of eating a Churu. She has only had several doses, but I can already see improvement in the redness in the whites of her eyes. I am so happy. Happy cat, happy life. I started on the minimum dose of 1/8th tsp twice a day and I wait to give it to her on a full stomach to avoid some of the digestive upset that can occur as a side effect. The amount you get in the tube is very affordable compared to others in oral drops or other powders and gels that are super expensive on dosing average. I also felt confident to purchase Felisyl due to it receiving the seal of approval from the NASC and believe it or not, during my research of Lysine products, it is even recognized under Good RX for its health benefits and prevention maintenance for my beloved feline along with several other vet formulated lysine products, but they were double to triple the purchase price. Very happy with my decision and hoping she continues to improve in her health, allergies and keeping her immune system well and strong. This product is so much cheaper than a Vet bill or repeat visits because the symptoms are only treated instead of trying to clear the underlying condition that this gel or more like a paste actually does for her internally and systemically. Allergies begone.

### ⭐⭐⭐⭐⭐ Great for FeLV+ cats!
*by M***N on May 4, 2026*

We have 2 cats with feline leukemia and started giving them this 2x/day. I have picky cats so its hard to find something they will actually eat but they love this! I have seen improvement in my cats eye drainage and sneezing! Will be repurchasing.

### ⭐⭐⭐⭐⭐ Works Well!
*by D***A on March 16, 2026*

We recently got a new cat - about 2 years old - from a shelter. She was having issues with runny eyes, runny nose, and occasional wheezing. The vet said this was common and recommended Felisyl. She loves the taste - I was mixing it in with her Churu but now I just dollop it on top of her food and she licks it up. It does seem to help her symptoms.

## Frequently Bought Together

- Felisyl L-Lysine Gel for Cats (5oz) – Supports Immune, Respiratory, and Eye Health. Eases Sneezing, Runny Nose, and Watery Eyes. Tasty Salmon Flavor - Made in The USA
- HomeoPet Feline Nose Relief, Safe and Natural Nasal and Sinus Supplement for Cats, 15 Milliliters
- VAZULI Pet Eye Health Ointment for Dogs, Cats, Cattle, Sheep, Horses, Birds and Puppies, Kittens 1/8 oz /3.5gr - 1 Tube

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-21*