---
product_id: 899953
title: "Viralys Daily L-Lysine Powder for Cats and Kittens, Fish Flavored Lysine Supplement for Cats and Kittens to Support Immune Health, Normal Eye Function and Respiratory Health, 100gm"
brand: "vetoquinol"
price: "VT13507"
currency: VUV
in_stock: true
reviews_count: 9
category: "Vetoquinol"
url: https://www.desertcart.vu/products/899953-viralys-daily-l-lysine-powder-for-cats-and-kittens-fish
store_origin: VU
region: Vanuatu
---

# Fish & Poultry natural flavor 500mg L-Lysine per dose Vet-recommended immune support Viralys Daily L-Lysine Powder for Cats and Kittens, Fish Flavored Lysine Supplement for Cats and Kittens to Support Immune Health, Normal Eye Function and Respiratory Health, 100gm

**Brand:** vetoquinol
**Price:** VT13507
**Availability:** ✅ In Stock

## Summary

> 🐾 Keep your cat thriving with Viralys — the daily lysine boost they actually crave!

## Quick Answers

- **What is this?** Viralys Daily L-Lysine Powder for Cats and Kittens, Fish Flavored Lysine Supplement for Cats and Kittens to Support Immune Health, Normal Eye Function and Respiratory Health, 100gm by vetoquinol
- **How much does it cost?** VT13507 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/899953-viralys-daily-l-lysine-powder-for-cats-and-kittens-fish)

## Best For

- vetoquinol enthusiasts

## Why This Product

- Trusted vetoquinol brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Multi-Age Support:** Perfectly suited for cats and kittens of all ages to boost immunity and reduce viral symptoms.
- • **Veterinarian Trusted:** Backed by vets for safe, reliable support of immune, eye, and respiratory health.
- • **Palatable Fish Flavor:** Specially formulated fish and poultry flavor ensures easy mixing with wet food for picky cats.
- • **Cost-Effective Wellness:** Long-lasting 100gm jar with included scooper offers an affordable daily supplement solution.
- • **Clinically Effective Dosage:** Delivers 500mg L-Lysine twice daily to manage flare-ups and maintain feline health.

## Overview

Vetoquinol Viralys Daily L-Lysine Powder is a vet-recommended, fish-flavored supplement delivering 500mg of L-Lysine per dose to support immune, eye, and respiratory health in cats and kittens. Designed for easy mixing with wet food, it helps manage feline herpes flare-ups and promotes long-term wellness, making it a trusted, cost-effective choice for proactive cat care.

## Description

Buy Vetoquinol Viralys Daily L-Lysine Powder for Cats and Kittens, Fish Flavored Lysine Supplement for Cats and Kittens to Support Immune Health, Normal Eye Function and Respiratory Health, 100gm: L-Lysine - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: GREAT FOR FELINE HERPES! LYSINE SUPRESSES THE AMINO ACID ARGININE, RESPONSIBLE FOR FLARE UPS!!! - I work w/ my local VSA ( voluntary services for animals). I took in a few kittens that's eyes were almost completely shut with crust & their little noses were covered in crust & mucus. A pitiful site :( . I quickly took all 4 to the vet within 24 hrs. WELL, after they said it was "Feline herpes", (an upper respiratory infection that doesn't go away but can be controlled) IT ended up costing me close to $800!! With Vet costs, testing costs, & the "Wonderfully expensive" medication they gave me for Each cat, That helped some but not much!! They had liquid meds, meds that had to be put INTO their eyes like 4xs a day, & some other antibiotics. It was awful , & seriously it didn't help much at all. It lessened it some, but they needed the meds constantly! I looked on the Internet for any info I could find & found out about LYSINE !! I really thought it was a bunch of "bull" but was willing to TRY anything! I 1st bought a paste & a gel- the cats hated it. I then bought this powder. I mixed it into wet food ( not too much or they taste it!) & they ate it! After a week I noticed all their symptoms were really improving! I had STOPPED the Vets meds as the cost was killing me & not really helping them. After a MONTH all the cats were totally better, no crusty gooey eyes, no crusty nose, sneezing, ALL GONE!! I was amazed!! I studied it more, the use of L LYSINE & it's effects. It surpresses what makes the Herpes virus flare up in the system, so taking it on a Dailey basis means you won't get the flare up & the full blown symptoms! It also works in humans as well. I kept the kittens & have given them forms of LYSINE for 2 yrs now & they have NOT had another flare up since! If I stopped it for a few months, I noticed some sneezing & gunk in their eyes in the 1st year & quickly put them back on it! With 5 cats ( I had a 3 yr old when I took these in, she caught feline herpes from them as well!) it's kinda hard to make sure each one gets 250 - 500 mg Ea. When they eat out of each others bowls! So I just put a scoop into 1 3 oz can of wet, feed them 3 cans & it works great. I tried the TREATS, most cats don't care for them, also many brands you have to give each cat like 10 treats 1-2 x a day! Woa! Or another brand the treats were huge! Only 2 a day because they were the size of a golf ball! Lol. So, the cat powdered LYSINE works good, it's flavored mixes well in food & good to start on. I had no luck putting this on DRY food, I have heard many ppl do that but my cats wouldn't eat the food & most just fell to bottom of dish/bowl. I also bought & use HUMAN grade LYSINE 500 mg tablets & crush them up w/ a spoon & mix into wet food. This is VERY cost effective! It taste stronger than this flavored powder, so use a good wet food to mix with & you wont have a problem. My cats got use to it fast. You can also buy LYSINE powder in BULK on here, it's human grade & already finely crushed up. It works GREAT & cost MUCH less. Plus I like that it's "human" grade. I now can skip months at a time with no LYSINE & they still get no flare ups. This LYSINE is a God send! I recommend this powder if starting out, it's flavored and cats will take it well. But cost wise, the pills, tablets, capsule at your store or on here ( cheaper!) are strongest & the best I've found( crush up finely) . bitter, but cats really don't "taste" bitter I've heard. Either WAY or BRAND you choose it will all but cure your cats of the virus, you won't have huge vet bills & expensive meds that are worthless. 5 cats taking LYSINE on & off for 2 yrs and they have NO MORE SYMPTOMS & are very happy healthy spoiled kitty's... So please do yourself, your wallet, & your cats a favor & put them on a LYSINE regimen of 250 mg a day OR - 500 mg 1-2 x's a day for a flare up or to start off with. Once symptoms subside, you can stay with 250 mg a day to keep them away for good! Btw, In order to replicate & cause FLARE UPS , in humans & cats the herpes virus needs "ARGININE" another amino acid such as LYSINE . when LISINE is taken at higher doses, it prevents the amino acid ARGININE from over producing & hence preventing outbreaks of the herpes virus. So just check your pets FOODS, TREATS etc for any ARGININE ( L-ARGININE ) in them as this will ADD to your problem!! There ARE foods with this in the ingredient list I've found, so just FYI to be safe. Hope this helps someone with the problems I went through & learned from along the way!! :) Jenn ~
Review: A worthwhile suppliment - A stray 3.5-4 wk old kitten adopted us when she walked into my RV. She was starved & soaked +her backbone/ribs/hips protruded. She didnt know how to eat/drink water. Fed her then found where she came from. 2 days later she was back. Shed walked a long way at-risk owl/ raccoon bait.I kept her/fed/cuddled her. Her owner died that very night from fentynal OD,so it was meant to be. She was very congested w/teary eyes. Likely an upper respiratory infection-calicivirus. I have 3cats + 1-11wo kitten, so whats 1more. But i feared my kitties would catch her virus. 3 days later 2 showed signs; another w/in the week. Other baby, “Boa-Peep” never got sick. Anyibodies from breast feeding milk? I was a vet tech in my younger days & knew they needed amoxicillin when it turned bacterial, but no way could afford vet visit with all my rescues. Researched my options. Collostrum? L-Lysine? Colloidal Silver? I bought L-Lysine @ colloidal silver & had eye drops in my stash. Within 3 days i saw good change feeding them wet food 2x/day w/this suppliment & high concentrated quality colloidal silver staying careful to low doses. The 2 babies got 1/2 scoop each of the L-Lysine w/4 drops silver in wet food. I also used humdifyer w/salt in water and kept area very warm. Im still giving the concoction bc it if I skip a dose it’d come back but only in the youngest kitten- named her “Whisper” (shes deaf and hasnt really meowed yet). Whisper is now a fattened up long-hair tabby and about 5 weeks later she no congestion. She plays w/her foster sister and foster mom has allowed her to nurse with other kitten. Theyre way too old but “Obbi” mom is such a good mommy and its a chance to teach Whisper to play, fight, and clean herself. Ive decided to give all kitties L-Lsyine as a regular daily suppliment. Jar lasts a long time. Comes with little tiny scooper inside jar. I can see this jar lasting maybe 6 months for 5 kitties

## Features

- Daily L-Lysine Supplement - Viralys Lysine for cats helps support a strong immune system and can help support eye and respiratory health in cats and kittens of all ages
- Supports Feline Health Issues - Vetoquinol Lysine for Cats can help manage common feline health issues and provides support to help a cat's immune system, ocular health, and respiratory health
- L-Lysine for Cats - Viralys L-Lysine for cats and kittens provides specially formulated immune support for as long as needed to help manage conditions responsive to lysine
- Vet Recommended - Trusted by veterinarians, Viralys L-Lysine Powder provides a safe and reliable solution for supporting your cat's immune and respiratory systems.
- 500mg of Lysine - Viralys Powder delivers the veterinarian-recommended amount of lysine for cats at 500mg 2x daily, and kittens at 250mg

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000FULBT4 |
| ASIN  | B000FULBT4 |
| Active Ingredients | Active ingredients: L-Lysine hydrochloride, 500mg. Inactive ingredients: Brewer’s Dried Yeast, Hydrolyzed Fish (enzymatic), Hydrolyzed Poultry Liver (enzymatic), Mixed Tocopherols (a preservative), Sodium Acid Pyrophosphate, Sodium Sulfate. |
| Best Sellers Rank | #1,754 in Pet Supplies ( See Top 100 in Pet Supplies ) #3 in Cat Multivitamins |
| Brand Name | Vetoquinol |
| Customer Reviews | 4.6 4.6 out of 5 stars (9,494) |
| Date First Available  | May 25, 2006 |
| Department  | cat-vitamins-supplements |
| Flavor | Fish & Poultry |
| Global Trade Identification Number | 00030521041480 |
| Included Components | Vetoquinol Viralys Powder, 100gm |
| Is Discontinued By Manufacturer  | No |
| Item Form | Powder |
| Item Weight | 0.01 Ounces |
| Item model number  | 410633 |
| Manufacturer | Vetoquinol |
| Manufacturer  | Vetoquinol |
| Product Benefits | Immune Support |
| Product Dimensions  | 4 x 5 x 5 inches; 0.01 ounces |
| Target Species | Cat |
| UPC | 030521041480 884291149927 |
| Unit Count | 2.5 Ounce |
| Volume | 3.5 Fluid Ounces |

## Product Details

- **Brand:** Vetoquinol
- **Flavor:** Fish & Poultry
- **Item Form:** Powder
- **Item Weight:** 0.01 Ounces

## Images

![Viralys Daily L-Lysine Powder for Cats and Kittens, Fish Flavored Lysine Supplement for Cats and Kittens to Support Immune Health, Normal Eye Function and Respiratory Health, 100gm - Image 1](https://m.media-amazon.com/images/I/71IiAj4UUCL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: How much lysine in a "scoop" dose? How many doses in a 100 gram jar?**
A: Hi, according to what it says on the jar, "contains approximately 500 mg of L-Lysine Hydrochloride in a palatable base"  I'm not sure about how many doses in a 100 gram jar (it doesn't say on the jar). I only use it occasionally, so it lasts a really long time for me. They suggest one rounded scoop twice daily. I usually just use one scoop at night in their wet food and it seems to work well enough. The scoop is small, I would guess maybe around 1/8 teaspoon? A very good product at any rate and my cats seem to love the taste and will eat it when mixed in with their wet food. Hope this helps.

**Q: What are the ingredients in Vetoquinol Viralys Powder?**
A: I want to let people who are giving this product to their cats, what hydrolyzed food ingredients are.  Hydrolysis is basically chemical digestion.  The protein, in this case fish & liver, is boiled in sulfuric aced for anywhere from several hours to more than a day to break down the proteins.  Then lye is added to raise the ph back to neutral.  Just what I want to give my cats.  Or not!!!  This is the trouble with buying from the internet.  The full label is usually not available & even when it is, the print is usually so tiny, not to mention blurred,  as to be impossible to read.

**Q: What is the shelf life?**
A: If you buy it from us. To_Your_Health, you will be guaranteed to get the freshest products available.  As of today, December 28, 2015, the expiration date on the containers in stock should be December 2017 or better.  Thanks.

**Q: My cat won't eat wet food & only treats that R crunchy on outside & soft inside. Which might be best chance I have ?**
A: The same maker of the this powdered form of L-lysine also makes this supplement is the form of a crunchy treat and a flavored paste (no affiliation). I recommend (as a vet) 500 mg twice daily to begin with, you can titrate up or down to the most effective dose, but always follow the recommendation of your veterinarian. Also note that l-lysine is most effective against the respiratory/ocular symptoms caused by feline herpes virus, a viral (but not venereal) disease most cats have been exposed to and, just like love, herpes virus lasts forever. The amino acid L-lysine is believed to inhibit the recrudescence of the virus during periods of physiologic stress.

## Customer Reviews

### ⭐⭐⭐⭐⭐ GREAT FOR FELINE HERPES! LYSINE SUPRESSES THE AMINO ACID ARGININE, RESPONSIBLE FOR FLARE UPS!!!
*by J***Y on June 27, 2013*

I work w/ my local VSA ( voluntary services for animals). I took in a few kittens that's eyes were almost completely shut with crust & their little noses were covered in crust & mucus. A pitiful site :( . I quickly took all 4 to the vet within 24 hrs. WELL, after they said it was "Feline herpes", (an upper respiratory infection that doesn't go away but can be controlled) IT ended up costing me close to $800!! With Vet costs, testing costs, & the "Wonderfully expensive" medication they gave me for Each cat, That helped some but not much!! They had liquid meds, meds that had to be put INTO their eyes like 4xs a day, & some other antibiotics. It was awful , & seriously it didn't help much at all. It lessened it some, but they needed the meds constantly! I looked on the Internet for any info I could find & found out about LYSINE !! I really thought it was a bunch of "bull" but was willing to TRY anything! I 1st bought a paste & a gel- the cats hated it. I then bought this powder. I mixed it into wet food ( not too much or they taste it!) & they ate it! After a week I noticed all their symptoms were really improving! I had STOPPED the Vets meds as the cost was killing me & not really helping them. After a MONTH all the cats were totally better, no crusty gooey eyes, no crusty nose, sneezing, ALL GONE!! I was amazed!! I studied it more, the use of L LYSINE & it's effects. It surpresses what makes the Herpes virus flare up in the system, so taking it on a Dailey basis means you won't get the flare up & the full blown symptoms! It also works in humans as well. I kept the kittens & have given them forms of LYSINE for 2 yrs now & they have NOT had another flare up since! If I stopped it for a few months, I noticed some sneezing & gunk in their eyes in the 1st year & quickly put them back on it! With 5 cats ( I had a 3 yr old when I took these in, she caught feline herpes from them as well!) it's kinda hard to make sure each one gets 250 - 500 mg Ea. When they eat out of each others bowls! So I just put a scoop into 1 3 oz can of wet, feed them 3 cans & it works great. I tried the TREATS, most cats don't care for them, also many brands you have to give each cat like 10 treats 1-2 x a day! Woa! Or another brand the treats were huge! Only 2 a day because they were the size of a golf ball! Lol. So, the cat powdered LYSINE works good, it's flavored mixes well in food & good to start on. I had no luck putting this on DRY food, I have heard many ppl do that but my cats wouldn't eat the food & most just fell to bottom of dish/bowl. I also bought & use HUMAN grade LYSINE 500 mg tablets & crush them up w/ a spoon & mix into wet food. This is VERY cost effective! It taste stronger than this flavored powder, so use a good wet food to mix with & you wont have a problem. My cats got use to it fast. You can also buy LYSINE powder in BULK on here, it's human grade & already finely crushed up. It works GREAT & cost MUCH less. Plus I like that it's "human" grade. I now can skip months at a time with no LYSINE & they still get no flare ups. This LYSINE is a God send! I recommend this powder if starting out, it's flavored and cats will take it well. But cost wise, the pills, tablets, capsule at your store or on here ( cheaper!) are strongest & the best I've found( crush up finely) . bitter, but cats really don't "taste" bitter I've heard. Either WAY or BRAND you choose it will all but cure your cats of the virus, you won't have huge vet bills & expensive meds that are worthless. 5 cats taking LYSINE on & off for 2 yrs and they have NO MORE SYMPTOMS & are very happy healthy spoiled kitty's... So please do yourself, your wallet, & your cats a favor & put them on a LYSINE regimen of 250 mg a day OR - 500 mg 1-2 x's a day for a flare up or to start off with. Once symptoms subside, you can stay with 250 mg a day to keep them away for good! Btw, In order to replicate & cause FLARE UPS , in humans & cats the herpes virus needs "ARGININE" another amino acid such as LYSINE . when LISINE is taken at higher doses, it prevents the amino acid ARGININE from over producing & hence preventing outbreaks of the herpes virus. So just check your pets FOODS, TREATS etc for any ARGININE ( L-ARGININE ) in them as this will ADD to your problem!! There ARE foods with this in the ingredient list I've found, so just FYI to be safe. Hope this helps someone with the problems I went through & learned from along the way!! :) Jenn ~

### ⭐⭐⭐⭐⭐ A worthwhile suppliment
*by U***E on January 22, 2026*

A stray 3.5-4 wk old kitten adopted us when she walked into my RV. She was starved & soaked +her backbone/ribs/hips protruded. She didnt know how to eat/drink water. Fed her then found where she came from. 2 days later she was back. Shed walked a long way at-risk owl/ raccoon bait.I kept her/fed/cuddled her. Her owner died that very night from fentynal OD,so it was meant to be. She was very congested w/teary eyes. Likely an upper respiratory infection-calicivirus. I have 3cats + 1-11wo kitten, so whats 1more. But i feared my kitties would catch her virus. 3 days later 2 showed signs; another w/in the week. Other baby, “Boa-Peep” never got sick. Anyibodies from breast feeding milk? I was a vet tech in my younger days & knew they needed amoxicillin when it turned bacterial, but no way could afford vet visit with all my rescues. Researched my options. Collostrum? L-Lysine? Colloidal Silver? I bought L-Lysine @ colloidal silver & had eye drops in my stash. Within 3 days i saw good change feeding them wet food 2x/day w/this suppliment & high concentrated quality colloidal silver staying careful to low doses. The 2 babies got 1/2 scoop each of the L-Lysine w/4 drops silver in wet food. I also used humdifyer w/salt in water and kept area very warm. Im still giving the concoction bc it if I skip a dose it’d come back but only in the youngest kitten- named her “Whisper” (shes deaf and hasnt really meowed yet). Whisper is now a fattened up long-hair tabby and about 5 weeks later she no congestion. She plays w/her foster sister and foster mom has allowed her to nurse with other kitten. Theyre way too old but “Obbi” mom is such a good mommy and its a chance to teach Whisper to play, fight, and clean herself. Ive decided to give all kitties L-Lsyine as a regular daily suppliment. Jar lasts a long time. Comes with little tiny scooper inside jar. I can see this jar lasting maybe 6 months for 5 kitties

### ⭐⭐⭐⭐⭐ A staple for pet lovers
*by L***H on December 16, 2025*

I've had my car on this Lysine for years now and it truly keeps keep his feline herpes flare ups at bay. Even if he has a flare up this keeps them from getting out of control. I keep our other cat on it as well to protect her from his virus and she's free of it. I believe this really helps boost both their immune systems. Our vet originally told us about it and I was so happy to find it on here. Both our cats love the flavor and it smells just like fish - very important as cats depend heavily on their sense of smell for eating. It's super easy to mix in with their wet food and comes with a little scooper inside.

## Frequently Bought Together

- Vetoquinol Viralys Daily L-Lysine Powder for Cats and Kittens, Fish Flavored Lysine Supplement for Cats and Kittens to Support Immune Health, Normal Eye Function and Respiratory Health, 100gm
- Purina Pro Plan Veterinary Supplements FortiFlora Cat Probiotic Supplement for Cats with Diarrhea - 30 ct. Box
- Vetoquinol Viralys Daily L-Lysine Gel for Cats and Kittens, Maple Flavored Lysine Supplement for Cats and Kittens to Support Immune Health, Normal Eye Function and Respiratory Health, 5oz

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-05-09*