NOW Pets L-Lysine Immune System Support Cat Supplement, 8-oz jar

By NOW Pets
Rated 4.4526 out of 5 stars
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$10.60Chewy Price
$15.99Chewy Price
$10.07Autoship Price
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About This Item

  • Developed to easily provide L-Lysine to your feline companion.
  • Supports respiratory and ocular health as well as a healthy immune system.
  • Purr-fect for multiple-cat households or boarding needs.
  • Veterinarian recommended to support your four-legged friend.
  • Certified by the by National Animal Supplement Council.

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Top IngredientsAcive Ingredients: L-Lysine Hydrochloride.Poultry Meal, L-Lysine, Water...Active Ingredients: L-Lysine Hydrochloride 500 mg., Inactive Ingredients: Arabic Gum, Brewers Yeast...Active Ingredients: L-Lysine (Monohydrochloride), Ascorbic Acid (Vitamin C), Astragalus Root....Chicken Liver Flavor, Starch, L-Lysine...
LifestageAdult, Senior, KittenAdult, Senior, KittenAdult, Senior, KittenAdult, Senior, KittenAdult, Senior, Kitten
Health FeatureImmune Support, Respiratory Care, Eye CareImmune Support, Respiratory Care, Eye CareImmune Support, Respiratory Care, Eye CareImmune Support, Respiratory Care, Eye CareImmune Support
Food FlavorN/AN/AHickory, Herbs & SpicesN/AChicken, Liver, Poultry, Meat
Special DietGluten FreeN/AN/AN/AN/A
Food FormSupplementSupplementSupplementSupplementSupplement

Questions & Answers

15 Customer Questions

Is this product flavored? My cat suffers from food allergies and, therefore, she cannot have poultry/fish/etc. flavored items.
Answer by ChewyMay 30, 2019
This powder does not have any flavoring. The only ingredient is L-Lysine Hydrochloride, it does not contain any inactive ingredients.

How should I feed this to my 7 month old kitten? Mix it with food or dilute it?
Answer by ChewyFeb 24, 2022
This supplement can be given during or after mealtime. For cats 6 months or older: Feed 1/8 teaspoon twice weekly. For kittens under 6 months: Feed 1/16 teaspoon twice weekly.

Being that made in the usa now often means packaged in the usa, from what country are the ingredients?
Answer by ChewyMar 12, 2019
The human-grade L-Lysine used in this supplement is sourced from Korea or China and is prepared in trusted facilities and rigorously tested to ensure quality and safety.

Is there any evidence that L Lysine is beneficial to cats that are FIV positive?
Answer by ChewyJun 27, 2018
This supplement is formulated to help support a healthy immune system, normal respiratory health, and also helps to maintain ocular health. It is not designed as a treatment for FIV or other medical conditions. It is recommended to consult with your Veterinarian to determine the best and safest treatment plan for your pet.

ReviewsWrite a Review

Rated 4.4526 out of 5 stars
95 Reviews
Would recommend to a friend

95 Customer Reviews

Rated 5 out of 5 stars
By BabyNYC on May 31, 2022

Terrific supplement

I use a 1/4 teaspoon and put only half of that in to make the 1/8 teaspoon twice daily. I mix it with my Baby's wet food and water. She doesn't know it's there, or she's pretending not to know, she eats it all. I mix it really well though, perhaps people not having luck should try a bit more mixing... I will buy this again when we run out, her mood has improved and her coat is shiny and she's not doing her normal hotspot biting anymore either (she was a shelter rescue and came with her own sweet but sad little issues).

Rated 5 out of 5 stars
By Bear on Jun 28, 2022

Great Product

At a great price, was recommended by my cat's vet to help his immune system with the Feline Herpes Virus he acquired while in the animal shelter I adopted him from. Seems to be working when nothing else did.

Rated 4 out of 5 stars
By mole on May 28, 2022

check with your vet first

While this product has pure l lysine in it and that is a good thing.It was formulated by the companies vet.The dosage is extremely low .Certain cats need a stronger dose .What ever dose your vet recommends go by that .

Rated 1 out of 5 stars
By Echo on Jun 1, 2022

Cats did not like.

I like the idea of giving pure lysine without any other ingredients. Both cats would not finish their food when this is mixed in. Will try another brand.

Rated 5 out of 5 stars
By Marth on Apr 23, 2022

Healthy Kittens

I’m fostering again. Think 11 sneezing, runny noses and sets of watery eyes. Vet recommended L-Lysine as immune support. Success! It barely took a week and mixing it in their food made dosing easy. Just do what vet tells you.

Rated 3 out of 5 stars
By Rose on Feb 5, 2022

My disappointment

I purchased this product thinking it would do her good, but unfortunately my newly adopted cat did not like it. I think at the rescue place they had it in their food everyday and she just would not eat for me until I decided to just give her food without it, and she finally started eating. I was more disappointed than her.

Rated 5 out of 5 stars
By Sara on Feb 14, 2022

Great, afordable and practical

Great way to get L-lysine into my cat. Low cost and no mess. I work at a vet clinic and the product we sell for this is exspensive, messy and stinky. This is so easy i can mix it in wet food or my cat will drink it when in a small amount of water.

Rated 5 out of 5 stars
By Henry on Jan 17, 2022

Harpies' virus

Due to supply shortage to the L-Lysine I had to change Henry's medication for his harpies'. With a lot of thoughts as to which I should purchase I have decided to get NOW Pets L-Lysine. Henry is not an easy cat to make changes to medications. The product label said that this would disappear without any flavor was the reason I decided to try it. I was amazed as to how fast the powder melted when I mixed it in his wet food. It works so much better to keep the virus under control. It also has changed his fur to a fluffy and brighter black and white. I totally recommend this product because of the changes in Henry. He has been on L-Lysine for at least 15 years.

Rated 5 out of 5 stars
By Annie on Jan 16, 2022

Now Lysine Powder

I have been using this product for 10 yrs. as recommended by the folks who sold me my two kittens. I hope that is why they are still very well.

Rated 5 out of 5 stars
By kourt on Dec 11, 2021

cats don’t even notice it!

This is the best lysine supplement I’ve found that my kitties can’t detect! I just sprinkle over their wet food in the morning & they eat it without argument. Love it!