Redefine Quality with Viralys’s Top Picks

Your lifestyle upgrade starts here—shop our exclusive Viralys collections.

Original Extra Strength L-Lysine Powder for Cats and Dogs -Improved Immune Response, Respiratory Health, and Eye Function. All Natural Chicken for Flavor. Extra Large 125 Grams.

4.4

$28

Vetoquinol Viralys Powder L-Lysine Supplement for Cats, 600g and Flexadin Advanced Hip and Joint Supplement for Dogs and Cats Bundle

$346

Vetoquinol Viralys Gel, 5oz

4.4

$48

Vetoquinol Viralys Powder L-Lysine Supplement for Cats, 100g and Flexadin Advanced Hip and Joint Supplement for Dogs and Cats Bundle

$132

Nutricost L-Lysine Powder 500 Grams - Pure L-Lysine, Non-GMO, Gluten Free

4.5

$26

Alpha PawHuman Grade for Pets - Cat Lysine Supplement - Extra Servings 5-10 Month Supply - Natural Lysine (8 Ounces/227 Grams)

4.4

$36

Vetoquinol 410499 AllerG-3 Capsules and Liquid,60 ct

4.6

FREE

Vetoquinol 410634 Viralys Powder, 600 g

4.7

$200

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

3.9

$21

Vivaldis VI-FI Forte 1.34 ml - Single Pipette - Spot on Solution for Prevention & Effective Control of Flea, Tick & Chewing Lice Treatment for Dogs Weighing from 10 to 20 kg (Pack of 2)

$269

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

4.2

$34

Vetoquinol Viralys Gel L-Lysine Supplement for Cats, 5oz - 2 Pack - Cats & Kittens of All Ages - Immune Health - Sneezing, Runny Nose, Squinting, Watery Eyes - Palatable Maple Flavor Lysine Gel

4.5

$67

Versele-lagaOropharma Ideal Pills (500 Pieces)

4.4

$79

Pet Naturals of Vermont, L-Lysine 60 Fun-Shaped Chews.

$50

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

4.4

$23

Felisyl Immune System Support(L-Lysine) Granules for Cats 3.5oz(100g)

4.0

$27

Strawfield Pets L-Lysine Immune Support for Cats & Kittens - 200g Chicken Liver Flavor Granules with Scoop, Immune Health Supplement Cat Cold Relief, Sneezing, Congestion, Running Nose, Watery Eyes

4.3

$35

Vetoquinol Viralys L-Lysine Supplement for Cats - Cats & Kittens of All Ages - Immune Health - Sneezing, Runny Nose, Squinting, Watery Eyes - Flavored Lysine Powder

4.6

$49

Trulysine Viralysine L-Lysine Gel Supplement for Cats, 5oz - Cats & Kittens of All Ages - Immune Health - Sneezing, Runny Nose, Squinting, Watery Eyes - Palatable Maple Flavor

4.3

$27

VIVALDIS Ocoxin Pets, 150ml

4.4

$87

Trulysine Viralysine Gel L-Lysine Supplement for Cats, 10 oz - Cats & Kittens of All Ages - Immune Health - Sneezing, Runny Nose, Squinting, Watery Eyes - Palatable Maple Flavor

$62

Vetoquinol Pro-Pectalin Oral Paste for Dogs & Cats – 30cc, Chicken Flavor – Helps Reduce Occasional Loose Stool & Diarrhea, Balance Gut pH, Support Normal Digestion & Intestinal Flora

4.5

$35

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

4.6

$33

Vetoquinol Enisyl-F Oral Paste: L-Lysine Supplement for Cats - Tuna Flavor, 3.4oz (100mL) Pump

4.4

$63

PranaPets Cold Symptom Support for Cats & Dogs | Natural Formula Safely Aids with Colds, Seasonal Allergies & Kennel Cough | Helps Open Airways for Easy Breathing

4.1

$52

Under the WeatherPet L-lysine Powder Cat Supplement | Natural Vet Formulated Lysine Powders for Cats and Kittens | Promotes Balance Healthy Immune Support and Boost Overall Health Response (2.54 Oz)

4.1

$32

HomeoPet Nose Relief, Safe and Natural Nasal and Sinus Medicine for Cats, Dogs, and Other Small Animals, Pet Congestion Medicine, 15 Milliliters

4.2

$29

Rx Vitamins Liquid Immuno Dog & Cat Immune Support - Reishi Mushroom Plus L-Lysine for Cats - Dog Immunity Booster Supplement - Bacon Flavor - 2 oz.

4.2

$40

L-Lysine Powder for Cats, 120g Lysine Powder Supports Cats Immune System, Respiratory Health & Visual Function – Lysine Powder Improve Cats Eye Discharge, Pets Health Supplies, Salmon Flavor - 4.23oz

4.3

$16

BLUERISECat Lysine Supplement Gel, 5oz - Support Feline's Immune System and Respiratory Health, Increased Eye Discharge, Nasal Branching in Cats, Stomatitis, Skin infections,Sneezing, Runny Nose

4.4

$35

Tomlyn Immune Support Daily L-Lysine Supplement, Fish-Flavored Lysine Chews for Cats and Kittens, 30ct

4.2

$28

Felisyl Immune System Support for Cats - Amino Acid L-Lysine - Produce Antibodies - Healthy Tissue, Respiratory Health, Vision - 60 Soft Chews

3.4

$28

Horbäach L-Lysine Powder for Cats | 500mg | 12oz | Cat Health Supplement | Non-GMO, Vegetarian Formula | by River & RULA

4.5

$16

Epakitin - 60 grams

4.6

$50

Four PawsHealthy Promise Immune Support with L-Lysine Chews for Cats Immunity 110 Count

4.0

$22

Under the WeatherPet Daily Cat L-Lysine | Boost Immune System Reduce Respiratory Symptoms | Maintain Normal Immune System Response | 60 Star Shaped Soft Chews

3.9

$39

Lysine for Cats-Lysine Powder for Cats, Immune Support for Cats, Supports Immune and Eye Health Supplement, Aid with Reduces Eye Discharge, Alleviates Sneezing and Runny Nose

4.6

$27

FELO LYSINE - L-Lysine Powder for Cats 300 mg (Thomas Pet Earlier), 12 oz

3.9

$49

L-Lysine Powder for Cats, Lysine Supplement for Cats, Support Immune System, Respiratory Health & Visual Function and Allergy Relief, Pets Health Supplies Multivitamins, Salmon Flavor - 4.23 oz / 120g

4.1

$4

Lysine Supplement for Cats, Cat Treats for Sneezing and Runny Nose, Cat Cold, Cat Immune Support, Eye Function, and Respiratory Health, L-Lysine cat Vitamins for Cats (120 Pills, Salmon)

3.9

$19

VETRISCIENCELysine Pro - Immune & Eye Care Supplement for Cats - Supplement Formula for Immunity & Heart Health Support - Feline Wellness Aid with L-Lysine - 120 Chews

4.0

$42

Optix Care Nutritional Supplement for Cat & Kittens, 60 ct Bag

$25

iHeartCats L-Lysine for Cats - Immune & Respiratory Supplement for Cats - Cat Sneezing & Runny Nose Relief - L-Lysine Powder with Cat Nip - Chicken & Salmon Flavor

4.1

$20

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

4.6

$37

Cats & Kittens of All Ages - Immune System Support - Supports Healthy Tissue, Respiratory, and Vision - Fish-Flavored - 10.5 oz, 3-Pack L8

3.0

$43