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

By VetriScience
Rated 3.9005 out of 5 stars


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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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Top IngredientsActive Ingredients: L-Lysine, N, N-Dimethylglycine HCl (D mg)....l-lysine, natural chicken liver flavor, oat flour...Active Ingredient: L-lysine., Inactive Ingredients: Artificial Sweetener, Citric Acid...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...Active Ingredients: L-Lysine Hydrochloride., Inactive Ingredients: Citric Acid, Edetate Disodium...
LifestageKitten, Adult, SeniorKitten, Adult, SeniorKitten, Adult, SeniorAdultAdult
Health FeatureImmune SupportImmune SupportEye Care, Immune Support, Respiratory CareImmune Support, Respiratory Care, Allergy ReliefImmune Support
Food FlavorPoultry, Meat, Chicken, LiverFruits & Vegetables, ChickenSalmonChicken
Food FormSupplementSupplementSupplementSupplementSupplement
Special DietNo Corn No Wheat No Soy, Non-GMO, Natural

Questions & Answers

31 Customer Questions

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.

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.

ReviewsWrite a Review

Rated 3.9005 out of 5 stars
965 Ratings
Would recommend to a friend

965 Customer Reviews

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 AngelB 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 2 out of 5 stars
By PearlMinuet 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 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!

Rated 5 out of 5 stars
By CatsMom74 on Aug 31, 2023

Quality Supplement

Our vet recommended these and we initially purchased them from their office. I decided to check Chewy to see if I could purchase it there for a much more reasonable cost. They appear to help our cat with his allergy issues and the best part is he eats them!

Rated 1 out of 5 stars
By Deyton18 on Aug 17, 2023

None of our animals would touch, so disappointed

4 cays (one who would eat a rock if we put it in his bowl, none would touch these. In past these were a staple to healing a special needs cat, idk what happened,its been awhile since bought.Product seemed harder,smelt bad, and even our puppy wouldn't touch! He loves even stinky stuff.

Rated 3 out of 5 stars
By Efo on Jul 12, 2023

Good and he loves it, but....

my problem with this is more the condition the product was delivered. it was under a 40 lbs box of cat litter and partially crushed. The treats are stuck together in one big glob and I have to break it off to give it to my cat. Some are fine, but other wise, it as a bit of a pain and should not have been deliered that way. My cat loves it and eats them readily and it is a easy way to give him the lysine- He has FIV, so I thought the immune boost would be good for him.

Rated 1 out of 5 stars
By Maria on Sep 1, 2023

My cats won't eat them

My kitties didn't like the taste of these chews,they aren't soft so I broke them up in little pieces for them. Also tried mixing them in wet food but I gave up after a few tries. Going to try the powder instead

Rated 1 out of 5 stars
By Brenda on Sep 13, 2023

VertiScience Soft Chews

Purchased as it was Veterinarian Recommended Brand, however I cannot get any of my Felines to eat. Have 2 Indoor & 2 Outdoor Felines, not one of them will eat. Very Disappointed.