VetriScience Vetri-Lysine Plus Chicken Liver Flavored Soft Chews Immune Supplement for Cats

By VetriScience
Rated 3.8874 out of 5 stars


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$13.26Chewy Price
$16.90Chewy Price
$12.60Autoship Price
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About This Item


  • Lysine is an essential amino acid for felines that must be ingested through food or supplements
  • Recommended for cats that need added immune support, respiratory health support and for other conditions that are responsive to lysine
  • Advanced formula supports respiratory and immune systems with lysine and DMG and also builds collagen to keep your cat’s skin and coat healthy and shiny as well as support eye health in kittens
  • Recommended by veterinarians and easy to administer in a tasty chicken-flavored bite-sized chew
  • Lysine is often recommended to support immune health-especially when cats are being boarded or live in a multi-cat household

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Nutritional Information

Feeding Instructions


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Learn More About VetriScience From Our Team of Experts

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Top IngredientsActive Ingredients: L-Lysine, N, N-Dimethylglycine HCl (D mg)....Active Ingredients: L-Lysine Hydrochloride 500 mg., Inactive Ingredients: Arabic Gum, Brewers Yeast...Active Ingredients: L-Lysine (Monohydrochloride), Ascorbic Acid (Vitamin C), Astragalus Root....l-lysine, natural chicken liver flavor, oat flour...L-Lysine: 275 mg/10 chews (27.5 mg per chew), Colostrum (15% lgG): 55 mg/10 chews (5.5 mg per chew), Omega-3s (Fish Oil...
LifestageKitten, Adult, SeniorKitten, Adult, SeniorKitten, Adult, SeniorKitten, Adult, SeniorAdult
Health FeatureImmune SupportEye Care, Immune Support, Respiratory CareEye Care, Immune Support, Respiratory CareImmune SupportImmune Support, Respiratory Care, Allergy Relief
Food FlavorPoultry, Meat, Chicken, LiverHerbs & Spices, HickoryUnflavoredFruits & Vegetables, ChickenChicken
Food FormSupplementSupplementSupplementSupplementSupplement
Special DietNo Corn No Wheat No Soy, Non-GMO, Natural

Questions & Answers

31 Customer Questions

How big are these treats? My cats love treats but they can't handle large kibble bits. Are these bite sized treats?
Answer by ChewyNov 11, 2019
These chews are approximately the diameter of a dime.

Instead of giving twice daily can I just give all at once?
Answer by ChewyJan 02, 2018
To ensure the best results, following the feeding instructions of twice daily is recommended.

Can my cat with kidney disease take this?
Answer by ChewyOct 29, 2018
Due to your pet's diagnosed condition, we encourage consulting your Veterinarian to see which chews would be safe for them. Each pet's condition can vary and the vet will be able to monitor them and give the best recommendations according to your pet's tested levels.

What milligram of lysine is in each chew?
Answer by ChewyJul 03, 2017
There are 250 milligrams of L-Lysine per 2 chews.

ReviewsWrite a Review

Rated 3.8874 out of 5 stars
977 Ratings
Would recommend to a friend

976 Customer Reviews

Rated 1 out of 5 stars
By Spencer on Nov 5, 2023

Not the Same

These used to be different and they've changed the recipe and now my kitty won't touch them. I noticed when I opened them they smelled quite a lot different from the previous bags I bought last fall when my cat's herpes flared up. He, apparently, agrees and doesn't want anything to do with them. To their credit, Chewy was quick to fix the problem but the product itself has changed which is sad. Even more so because the other lysine product I swear by seems to be discontinued completely.

Rated 1 out of 5 stars
By salvatore on Oct 27, 2023

Bad smell and cat no longer wants them

I hope the company changes the formula back to the original one. My cat has eaten these for 9 years now. But the last couple of bags he will no longer eat them. They also have a different smell to them. If they go back to original formula I will buy them again for sure. But I can't keep trying bag after bag. Chewy is great as they sent me this last bag for free but once again my cat will not touch it.

Rated 2 out of 5 stars
By ringo on Sep 20, 2023

Upset tummy

I gave these to my young 5 week old kitten per recommendation of my vet, they gave him diarrhea. I stopped. I still had them when a sick feral became part of our family. They seemed to help him, but he had severe diarrhea for months. I had him on 3 different meds thinking he had some weird things going on. Vet could not find anything And I was on verge of spending $150 for testing. Then I took him off everything and he got better...finally! So I gave him a few weeks and his runny eyes started again. So I gave him a low dose of the Lysine, 1 twice daily. Well, the diarrhea is back. I can't help think these are the culprit. I will be throwing them in the trash. Really hoped they would help him...they actually seemed to, except for the diarrhea...severe. so not worth it.

Rated 2 out of 5 stars
By Angela on Sep 27, 2023

All stuck together & none of the cats would eat it.

These have great reviews and were recommended by my vet for our 3 cats, since one is for sure positive for feline herpesvirus. I opened the package and the majority of the treats were stuck/smashed together. Maybe that's normal but it was a good solid chunk. ? Regardless, none of the kitties wanted to eat them. I even broke them up in smaller pieces hoping it would smell better and they'd try them. Nope. I'm sure it's a good product, but we will never know.

Rated 5 out of 5 stars
By Jerry on Nov 27, 2023

Great Medicine

One cat has Feline Herpes Virus and Lysine Plus keeps her nose from running and her eyes from watering. She loves the flavor.

Rated 1 out of 5 stars
By Morgan on Oct 14, 2023

Cat will not eat

I got these for my cats asthma and she will not eat these at all. They must smell bad or something. I even tried breaking them up in pieces and she still won’t eat them and she’s not a picky cat.

Rated 2 out of 5 stars
By Shandy on Sep 20, 2023

Unfortunately not a hit

I was so excited to get these in as my vet recommended these for my cattery. So since I have 12 cats I purchased the biggest count. Unfortunately only 2 of them will willingly eat these treats. The rest have to be grounded up and mix into their wet food.

Rated 1 out of 5 stars
By My3Siberians on Aug 26, 2023

Big miss

Two of my three Siberians need lysine immune support, and I have been adding a powder to their wet food. I thought the treats would be easier (if more expensive per dose) and bought these in a recommendation of a friend who's cats love this brand. None of my 3 would touch these, over a week long period of offering them :( big miss on this product for us!

Rated 2 out of 5 stars
By Johanna on Nov 6, 2023

Not so soft chews

Have used for 5 years and my cat is no longer interested. They are hard and smell awful now. I have to cut them up and hide them in food.

Rated 1 out of 5 stars
By Carol on Sep 6, 2023

Cats won't eat these anymore

As others have mentioned in these reviews, they changed the formula on these, they smell funny and my cats won't eat them. Chewy is so great! They refunded my money and asked that I just donate the treats or give them to someone with cat(s). I didn't have to return them!