The Best Lysine For Cats

If your cat suffers from respiratory disorders, lysine can help. This supplement is an essential amino acid, which means it's all-natural and safe for most pets. It can help improve symptoms of viruses and allergies that affect pets' eyes or breathing systems. It comes in several tasty forms, from a powdered food topper to tiny soft treats. Read on to learn about some of the best-quality lysine supplements for cats on the market today.

What to Look For

We put our all into this search for the best lysine for cats. We strived to ensure every product listed below is beneficial to cats’ health and flavored well to ensure your pet will be willing to eat it. Last but not least, we focused on the safest supplements for pets. Our top pick was Pet Naturals Chicken Chews for their potent supplement dosage and easy-to-feed style. We also liked the clickable treats from Kitty Up for a real cat delicacy. Read on to learn more about each of these products, as well as our other top picks.

Pet Naturals Chicken Chew Lysine for Cats

Treats with benefits

These tasty morsels are jam-packed with immune-boosting power for pets.
Best Overall

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This lysine for cats is as easy to administer as giving your pets a treat. It comes in morsel form, with each piece containing 250 milligrams of lysine. This average dose can often be fed to cats 1-2 times per day, depending on symptoms and veterinarian recommendations. The package contains 60 pieces, which provides you with a 30 to 60 day supply. Even better, the chicken liver flavor and cute fish shapes are sure to be enjoyed by kitties of all kinds.


  • Affordable price
  • Veterinarian-recommended
  • Resealable pouch keeps treats fresh
  • Designed to contain adequate moisture for cats’ dietsĀ 
  • Made without wheat, corn, or other harmful additives or preservatives


  • May be too hard for cats who prefer soft foods and treats

Now Pet Health Powdered Lysine for Cats

Sprinkle away

This supplement is easy to spread on your kitty's food, and it only takes a fraction of a teaspoon each day.
Runner Up

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This lysine for cats ensures painless consumption with its flavorless powder form. There are 276 milligrams of lysine per 1/8 teaspoon. The serving sizes range from 1/16 to 1/8 teaspoon, which is almost unnoticeable for pets. What’s more, the supplement is NASC-certified for animal product integrity. We especially like that it’s made by a family-owned company in the United States and held to the same testing procedures as human supplements.


  • Reasonable price
  • Ideal for picky cats
  • Mix into food or wet treats
  • Comes in a long-lasting 8-ounce bottle
  • Simple over/under 6-month serving size guide


  • Not tested in pregnant or nursing cats

Vetoquinol Maple Gel Lysine for Cats

Lick it up

This syrup-flavored product is both palatable and beneficial for cats.
Best Gel

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If your cat enjoys the occasional lap of maple syrup like most felines, this lysine supplement will be easy to feed. It’s a gel that they can simply lick off of a plate or sip from a medicine syringe. There are 250 milligrams of lysine in every 1/4 teaspoon. 1/2 teaspoon may be recommended for older pets. The mixture is NASC-certified for complete safety. Each tube provides a 1-2 month supply depending on your pet’s dosage.


  • Quick results
  • Smooth texture
  • Vet-recommended
  • Good flavor for picky pets
  • Available in packs of 1 or 2 tubes


  • Higher than average priceĀ 

Zesty Paws Soft Bacon Chew Lysine for Cats

Bring on the bacon

These snacks are flavored like everyone's favorite breakfast meat, so even the pickiest pets can easily eat them.
Best Flavor

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These yummy treats are bacon flavored, making them more enjoyable for cats to take. They include the most-often recommended dose of lysine, as well as the following ingredients for antioxidant support: EpiCor, Quercitin, and Astragalus Root. Each of these ingredients supports immune function, allergy support, eye health, and more. Every piece is made in the United States with all-natural ingredients without harmful artificial fillers or preservatives.


  • Soft chew
  • Average price
  • 1-2 month supply
  • Most cats like the flavor
  • NASC-certified for safety


  • Only 100 mg lysine per 2 chews, though the other ingredients provide additional benefits

Kitty Up Lickable Pouches with Lysine for Cats

A true delicacy

These packets of wet food treats boast health benefits and a tasty flavor.
Best Lickable

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These lysine pouches for cats are a real treat with their clickable form. Twelve tubes are included with your purchase, each of which contains a real tuna mix with lysine, taurine, and amino acids added. No grains or artificial ingredients are included. Every packet is a serving size, so there’s no need to measure on your end. The company is a women-owned small business that partners with a cat fostering organization, so you can feel good supporting their efforts through your order as well.


  • Enjoyable flavor
  • Made for cats of all ages
  • Also available in packs of 50
  • Can be fed alone or as a food topper
  • Supports not only immune health but also heart health and digestion


  • May be more difficult to customize the amount of lysine your cat consumes

Frequently Asked Questions

What are all of the benefits of lysine for cats?

Lysine is most often used for immune health and respiratory support. It can help prevent illnesses that cause watering eyes in cats, as well as sneezing. It may also support cats with allergies.

Is lysine safe for all cats?

Lysine is safe for most cats. Some products are designed for kittens aged six weeks and up, while others begin at 12 weeks. Most products state that they are not intended for pregnant and nursing cats. It’s always a good idea to check with your vet before starting a new supplement for your cat, lysine included.

About the Author

Jessica has two kids, but she's a parent to numerous pets, including cats, dogs, and even reptiles. Needless to say, she's an animal lover. She admits to spoiling her furry friends, and now wants to share her decades of experience in pet care with the rest of the world to help others find the best products for their four-legged families.

Why Trust Us

Since 2008, CatTime has provided millions of cat owners with all the information they need to keep their pets happy and healthy. Our experts know exactly what it takes to raise our furry friends and our goal is to help all owners, new or experienced, care for their cats with all the right food, toys, equipment, and accessories.