Tomlyn L-Lysine Powder Supplement for Cats, 100-g jar

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About This Item

Details

  • Supports your cat’s immune system, eye health and respiratory health.
  • Paw-some for immune support and other conditions responsive to L-Lysine.
  • Just feed one scoop of powder per day to support your cat’s health.
  • Powder can be sprinkled over dry feed or mixed with canned food (sold separately).
  • Also available in bite-sized chews (sold separately).

Ingredient Information

Feeding Instructions

Questions & Answers

22 Customer Questions

How many servings per container?

Originally posted and answered on chewy.com
Answer by nicolep • Sep 05, 2024
When giving 500 milligrams per day (1 scoop), there are 100 servings.

Is the Tomlyn Immune Support Powder Immune Supplement for Cats, 3.5-oz tub, item 72293 a grain free supplement?

Originally posted and answered on chewy.com
Answer by DonicaA • Mar 31, 2022
L-lysine does not have any grain in it. It is not certified grain free because it is not manufactured in a grain free environment.

What flavor is this?

Originally posted and answered on chewy.com
Answer by Andrea • Jan 25, 2022
This supplement has a chicken and fish flavor.

What ages can this be given to? What’s the youngest?

Originally posted and answered on chewy.com
Answer by nicolep • Jul 24, 2021
There is not an age restriction with Immune Support L-lysine. Your cat must be able to eat solid foods.
Reviews
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4.6
Rated 4.6 out of 5 stars
957 Ratings
Terms & Conditions

597 Customer Reviews

Rated 5 out of 5 stars
By saskia on Dec 11, 2025

Great for FELV Goose

Goose is a FELV+ cat who runs our household ;) She developed a sneeze recently and we wanted to try a natural remedy 1st to support her. This has halted immensely

Goose is a FELV+ cat who runs our household ;) She developed a sneeze recently and we wanted to try a natural remedy 1st to support her. This has halted immensely and we saw results by the next day. Along with saline nasal drops, she went from 60+ sneezes a day to 2-3 sneezes a day. We are also using Bach remedy (Pet rescue) on the tips of her ears to help her balance any stress through this.

Rated 3 out of 5 stars
By MuffinMimi on Mar 11, 2024

Smells strong

I tried the powder lysine but the smell is so strong my cats wont even eat the dry food.

I tried the powder lysine but the smell is so strong my cats wont even eat the dry food.

Rated 5 out of 5 stars
By Rey on Dec 16, 2025
Originally posted on chewy.com

Better alternative to chews

I used to give my cats the chewy lysine treats by smashing it up and adding to their food. They caught on eventually and refused to eat their wet food. I now add

I used to give my cats the chewy lysine treats by smashing it up and adding to their food. They caught on eventually and refused to eat their wet food. I now add this powder instead and they haven’t shown any resistance to it. It does have a chemical smell, but once I add it to wet food I no longer smell it. It has helped my cats herpes symptoms.

Rated 5 out of 5 stars
By Alexandra on Jan 14, 2026
Originally posted on chewy.com

This works!

Anytime our cats seem to be having a minor cold or allergies (herpes flare up- runny nose or watery eyes), we sprinkle this in their wet food once a day for about

Anytime our cats seem to be having a minor cold or allergies (herpes flare up- runny nose or watery eyes), we sprinkle this in their wet food once a day for about a week, and their symptoms completely go away.

Rated 5 out of 5 stars
By MommyMom on Dec 25, 2025
Originally posted on chewy.com

My picky cat eats it

What I love about this product is my picky cat eats it . I’ve gotten something from the vet she would eat and I couldn’t stomach . She eats Tomlyn in her food

What I love about this product is my picky cat eats it . I’ve gotten something from the vet she would eat and I couldn’t stomach . She eats Tomlyn in her food with no issues . So do the cats I feed outside. This is a 10/10 for me.

Rated 4 out of 5 stars
By kaitlyn on Nov 19, 2025
Originally posted on chewy.com

Good vitamins

My cat will tolerate a half scoop on his food, but, not a whole scoop. It has a fish smell that my cat loves, but, he won't eat a whole scoop with his food. I just

My cat will tolerate a half scoop on his food, but, not a whole scoop. It has a fish smell that my cat loves, but, he won't eat a whole scoop with his food. I just use a half scoop . He has leukemia so, this helps his immune system. It's easy to use and lasts a long time. It's a very small scoop, so it lasts long and is worth the price

Rated 5 out of 5 stars
By Sadie on Jan 13, 2026
Originally posted on chewy.com

Manages symptoms well

This works well for managing feline herpes. It will not treat an outbreak, but helps with maintaining health to prevent outbreak

This works well for managing feline herpes. It will not treat an outbreak, but helps with maintaining health to prevent outbreak

Rated 5 out of 5 stars
By Deb on Sep 30, 2025
Originally posted on chewy.com

It worked!

My foster cat came to me with continual eye discharge. I gave it lots of time, thinking maybe she was stressed in new environment, but nothing changed. Finally

My foster cat came to me with continual eye discharge. I gave it lots of time, thinking maybe she was stressed in new environment, but nothing changed. Finally decided to try this, even tho I couldn't find good research on its benefits, so I was skeptical. BUT.... it worked for Pippi! It took a good 3 weeks but it worked!! No more eye discharge. At some point I'll stop giving it to her and see what happens... hoping her body can manage without it, but if not, it's worth the cost. I can sprinkle it on top of her wet food and she has no problem with it.

Rated 5 out of 5 stars
By Michelle on Oct 29, 2025
Originally posted on chewy.com

Keeps my cat healthy

My cat has been on immune support since he was a kitten due to health complications, he hated the brand I used to buy him so I decided to go for a something new

My cat has been on immune support since he was a kitten due to health complications, he hated the brand I used to buy him so I decided to go for a something new and tried TOMLYN, he can’t even tell the supplement is in his food and he has been as healthy as can be!

Rated 5 out of 5 stars
By Pam on Oct 17, 2025
Originally posted on chewy.com

Works great

Have used it for years. Have 4 cats and when they get sick this is what gets them over it. Don’t mess with putting it in food. Mix 2 scoops in a little water in

Have used it for years. Have 4 cats and when they get sick this is what gets them over it. Don’t mess with putting it in food. Mix 2 scoops in a little water in shot glass and give with medicine dropper. They don’t fight and this way I know each one is getting their full dose. Best medicine for cats immune.