July 1, 2025

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10 Best lysine for cats of 2025

Save up to 23% off

Best Choice

1

Vetoquinol
Vetoquinol Viralys Daily L-Lysine Powder for Cats and Kittens, Fish Flavored Lysine Supplement for Cats and Kittens to Support Immune Health, Normal Eye Function and Respiratory Health, 100gm
Main highlights

Immune Support and Health Benefits
Daily L-Lysine supplement supports immune, eye, and respiratory health in cats.

Ideal for Cats with Health Issues
Perfect for managing sneezing, runny nose, and watery eyes in cats.

Highly Palatable Flavor
Praised for its fish and poultry flavor, making it easy to administer.
9.8

Exceptional

Our Rating

9.7
dispense easily

9.3
worth the money

9.3
Flavor
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Value for Money

2

Vetoquinol
Vetoquinol Viralys Daily L-Lysine Gel for Cats and Kittens, Maple Flavored Lysine Supplement for Cats and Kittens to Support Immune Health, Normal Eye Function and Respiratory Health, 5oz

20% Off
Main highlights

Immune Support and Health Benefits
Supports immune system, eye, and respiratory health in cats.

Ideal for Upper Respiratory Issues
Perfect for managing sneezing, runny nose, and watery eyes.

Highly Praised for Palatability
Cats love the maple flavor; easy administration noted by users.
9.6

Exceptional

Our Rating

9.9
Freshness

9.5
dispense easily

9.3
Simple to use
3

Coco and Luna
L-Lysine Supplement for Cats 900mg/scoop - Cat Supplement for Sneezing and Runny Nose, Cold, Immune Support, Eye Function, and Respiratory Health – Lysine Powder
Main highlights

Immune and Respiratory Support
L-Lysine supplement enhances immune function and supports respiratory health, reducing symptoms like sneezing and runny nose.

Perfect for Cats with Feline Herpes
Ideal for cats with immune or respiratory issues, especially those with feline herpes.

Easy to Mix with Food
Customers appreciate the fine powder form that mixes easily with wet food.
9.3

Excellent

Our Rating

9.3
dispense easily

8.7
Simple to use

8.0
worth the money
4

Felisyl
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
Main highlights

Premium Quality Gel
Crafted with care, this gel ensures high standards of quality and efficacy, providing top-notch immune support for your cat.

Ideal for Immune Support
Perfect for cats needing respiratory and immune system support, especially those with allergies or frequent sneezing.

Loved by Cats
Cats adore the salmon flavor, making it easy to administer as a treat.
9.2

Excellent

Our Rating

9.5
Simple to use

9.1
dispense easily

8.7
Aroma
5

SANTKOL
L-ysine Supplement for Cats - Immune Support - 60ML Lysine for Feline Respiratory, Sneezing, Runny Nose, Eye Function - Natural Cat Antibiotic Drops - Roast Chicken Flavor

10% Off
Main highlights

Immune Support and Health Benefits
L-Lysine drops enhance immune function, eye health, and respiratory support.

Ideal for Cats with Respiratory Issues
Perfect for managing sneezing, runny noses, and eye conditions in cats.

Loved for Its Chicken Flavor
Customers praise the irresistible roast chicken flavor that cats adore.
9.1

Excellent

Our Rating
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6

VETRISCIENCE
VetriScience Vetri Lysine Plus for Cats, 90 Chicken Flavored Chews - Immune and Respiratory Support Supplement for Cats
Main highlights

Key Features
Essential amino acid for cats, supports immune and respiratory health, delicious chicken liver flavor, made in the USA, 100% satisfaction guarantee.

Ideal Use Cases
Perfect for cats in boarding, multi-cat households, or those needing extra immune support. Enhances overall well-being.

Customer Reviews
Cats love the taste, owners report improved health and vitality. Praised for effectiveness and ease of feeding.
8.9

Very Good

Our Rating

8.9
dispense easily

8.0
Flavor

8.0
Freshness
7

TOMLYN
Tomlyn Immune Support Daily L-Lysine Supplement, Fish-Flavored Lysine Powder for Cats and Kittens, 3.5oz
Main highlights

Immune Support Benefits
L-Lysine supplement promotes eye, respiratory health, and strong immunity in cats.

Ideal for Feline Health Issues
Perfect for managing sneezing, runny nose, and inflamed eyes in cats.

Highly Praised Taste and Ease
Cats love the fish-flavored powder, making it easy to administer.
8.8

Very Good

Our Rating

9.9
Simple to use

9.5
worth the money

9.3
Flavor
8

Daybreak Nutrition
L-Lysine for Cats and Kittens - 900 mg L Lysine Powder for Cats for Immunity & Respiratory Support - Cat Supplement with L-Lysine, Prebiotics, Krill, & DMG for Immune System, Eye Health & Sneezing
Main highlights

Immune and Respiratory Support
L-Lysine Powder for Cats boosts immunity and provides respiratory support, enhancing overall feline health.

Ideal for Multi-Cat Households
Perfect for homes with multiple cats, reducing germ spread and supporting collective health.

Highly Palatable Formula
Praised for its palatability, cats readily accept it when mixed with food.
8.6

Very Good

Our Rating

8.2
Flavor

8.2
dispense easily

8.0
Aroma
9

Pet Naturals
Pet Naturals Lysine for Cats, Chicken Flavor, 60 Chews - Immune and Respiratory Support for Cats - No Wheat or Corn - Vet Recommended

23% Off
Main highlights

Immune Support and Respiratory Health
Lysine chews boost immune system and respiratory health.

Ideal for Multi-Cat Households
60-day supply perfect for households with multiple cats.

Flavor Cats Love
Chicken-liver flavor and fun shape praised by cat owners.
8.5

Good

Our Rating

8.0
Gentle

8.0
Freshness

8.0
worth the money
10

NOW Foods
NOW Foods Pet Health, L-Lysine Supplement, Powder, Formulated for Cats, NASC Certified, 8-Ounce

12% Off
Main highlights

Immune Support and Ocular Health
NOW Pets L-Lysine Powder supports immune, respiratory, and ocular health in cats.

Ideal for Feline Herpes Virus Management
Recommended for cats with Feline Herpes Virus to reduce breakout severity and duration.

Flavorless and Easy to Mix
Praised for being tasteless and odorless, mixes well with food or water.
8.4

Good

Our Rating

9.5
dispense easily

8.7
Aroma

8.4
worth the money

10 Best lysine for cats of 2025

1

Vetoquinol Viralys Daily L-Lysine Powder for Cats and Kittens, Fish Flavored Lysine Supplement for Cats and Kittens to Support Immune Health, Normal Eye Function and Respiratory Health, 100gm

9.7

9.3

9.3

How do we rank?

How do we rank?

Analyzing top stores

2

Vetoquinol Viralys Daily L-Lysine Gel for Cats and Kittens, Maple Flavored Lysine Supplement for Cats and Kittens to Support Immune Health, Normal Eye Function and Respiratory Health, 5oz

9.9

9.5

9.3

3

L-Lysine Supplement for Cats 900mg/scoop - Cat Supplement for Sneezing and Runny Nose, Cold, Immune Support, Eye Function, and Respiratory Health – Lysine Powder

9.3

8.7

8.0

4

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

9.5

9.1

8.7

5

L-ysine Supplement for Cats - Immune Support - 60ML Lysine for Feline Respiratory, Sneezing, Runny Nose, Eye Function - Natural Cat Antibiotic Drops - Roast Chicken Flavor

6

VetriScience Vetri Lysine Plus for Cats, 90 Chicken Flavored Chews - Immune and Respiratory Support Supplement for Cats

8.9

8.0

8.0

7

Tomlyn Immune Support Daily L-Lysine Supplement, Fish-Flavored Lysine Powder for Cats and Kittens, 3.5oz

9.9

9.5

9.3

8

L-Lysine for Cats and Kittens - 900 mg L Lysine Powder for Cats for Immunity & Respiratory Support - Cat Supplement with L-Lysine, Prebiotics, Krill, & DMG for Immune System, Eye Health & Sneezing

8.2

8.2

8.0

9

Pet Naturals Lysine for Cats, Chicken Flavor, 60 Chews - Immune and Respiratory Support for Cats - No Wheat or Corn - Vet Recommended

8.0

8.0

8.0

10

NOW Foods Pet Health, L-Lysine Supplement, Powder, Formulated for Cats, NASC Certified, 8-Ounce

9.5

8.7

8.4

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