September 14, 2025

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10 Best lysine for cats of 2025

Save up to 16% 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.
Key specs
- Immune Support:Supports strong immune system
- Respiratory Health:Helps manage sneezing
- Lysine:500mg 2x daily
- Convenient Format:Powder, easy to administer
- Natural Ingredients:Fish and poultry flavor
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

16% 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.
Key specs
- Immune Support:Supports immune system
- Respiratory Health:Helps manage sneezing
- Lysine:500mg 2x daily
- Convenient Format:Maple-flavored gel
- Natural Ingredients:N/A
9.6

Exceptional

Our Rating

9.9
Freshness

9.5
dispense easily

9.3
Simple to use
3

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.
9.5

Excellent

Our Rating

9.5
Simple to use

9.1
dispense easily

8.7
Aroma
4

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.
Key specs
- Pet Age:Older cats and kittens
- Function:Immune support
- Form:Powder
- Ingredients:Natural ingredients
- Health Benefits:Respiratory health
9.2

Excellent

Our Rating

9.3
dispense easily

8.7
Simple to use

8.0
worth the money
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
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.
Key specs
- Active Ingredients:L-Lysine HCl, Astragalus
- Form:Liquid
- Health Support:Immune support for cats
- Administration Method:Mixed with food
- Flavor:Chicken
9.1

Excellent

Our Rating
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6

Balanced Breed
Balanced Breed L-Lysine Cats Immune Support Soft Chews Made in USA Vet-Pharmacist Approved Seasonal Allergy Relief Cat Vitamins Indoor Cats Supplements Krill Oil Asthma Relief Cat Lysine Treats NonGMO
Main highlights

Premium Omega 3 and Antioxidant
Contains sustainable krill oil, superior to typical fish oil, boosting feline immunity and respiratory health.

Indoor Cats Wellness
Ideal for indoor cats needing immune support, respiratory relief, and allergy management.

Customer Praised Taste
Highly praised for its taste and treat-like form, even for picky eaters.
Key specs
- Immune Support:Cat immune booster
- Respiratory Health:Cat respiratory support
- Lysine:Cat lysine treats
- Convenient Format:Lysine cat treats
- Natural Ingredients:Natural lysine cat treats
9.0

Excellent

Our Rating

9.3
Flavor

9.1
dispense easily

8.7
quality of ingredients
7

Pet Honesty
Cat Immune Support Lysine - Cat Allergy Relief - Sneezing, Runny Nose, Watery Eyes - Cat Supplements & Vitamins with Omega 3s, L-Lysine, Antioxidants, Colostrum - Chicken (30 Day Supply)
Main highlights

Immune and Respiratory Support
Contains lysine, colostrum, and antioxidants to boost health.

Calming and Soothing Effects
Ideal for reducing stress during grooming or conflicts.

Popular Taste and Texture
Most cats enjoy the crunchy and creamy combination.
Key specs
- Immune Support:Contains colostrum, quercetin
- Respiratory Health:Supports respiratory health
- Lysine:Essential amino acid
- Convenient Format:Chews, crunchy outside
- Natural Ingredients:No artificial preservatives
8.7

Very Good

Our Rating

8.0
Freshness

8.0
pain management

8.0
worth the money
8

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

15% 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.
8.6

Very Good

Our Rating

9.5
dispense easily

8.7
Aroma

8.4
worth the money
9

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.
Key specs
- Immune Support:Supports immune system
- Respiratory Health:Supports respiratory health
- Lysine:L-Lysine supplement
- Convenient Format:Easy to dose
- Natural Ingredients:Fish-flavored powder
8.5

Good

Our Rating

9.9
Simple to use

9.5
worth the money

9.3
Flavor
10

VETRISCIENCE
VetriScience Vetri Lysine Plus - 120 Chews - Immune Support Cat Supplements and Vitamins with L-Lysine and DMG for Immunity and Respiratory Health
Main highlights

Immune Support and Health Benefits
VetriScience Vetri Lysine Plus supports immune system, collagen formation, tissue repair, and antioxidant activity for cats.

Best for Immune and Respiratory Health
Ideal for enhancing immunity and respiratory health in cats with allergies or frequent illnesses.

Customer Praised Taste and Effectiveness
Customers love the chicken liver flavor and effectiveness in alleviating allergy symptoms.
8.4

Good

Our Rating

8.9
dispense easily

8.0
Flavor

8.0
Freshness

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

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

4

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

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

Balanced Breed L-Lysine Cats Immune Support Soft Chews Made in USA Vet-Pharmacist Approved Seasonal Allergy Relief Cat Vitamins Indoor Cats Supplements Krill Oil Asthma Relief Cat Lysine Treats NonGMO

9.3

9.1

8.7

7

Cat Immune Support Lysine - Cat Allergy Relief - Sneezing, Runny Nose, Watery Eyes - Cat Supplements & Vitamins with Omega 3s, L-Lysine, Antioxidants, Colostrum - Chicken (30 Day Supply)

8.0

8.0

8.0

8

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

9.5

8.7

8.4

9

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

9.9

9.5

9.3

10

VetriScience Vetri Lysine Plus - 120 Chews - Immune Support Cat Supplements and Vitamins with L-Lysine and DMG for Immunity and Respiratory Health​

8.9

8.0

8.0

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VetriScience Vetri Lysine Plus - 120 Chews - Immune Support Cat Supplements and Vitamins with L-Lysine and DMG for Immunity and Respiratory Health