Tomlyn Immune Support L-Lysine Powder Cat Supplement, 3.5-oz tub

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Tomlyn Immune Support L-Lysine Powder Cat Supplement is a veterinarian formulated supplement that support your cat’s immune system, respiratory and eye health. Taste tested and loved by cats and kittens, safe and effective for cats of all ages.

Key Benefits

  • High levels of L-lysine at 500 mg per scoop
  • Helps manage conditions responsive to L-lysine including upper respiratory problems, conjuctivitis, and feline herpes
  • Supports normal respiratory health and help maintain normal eye function and health
  • Palatable powder makes administering to your cat easy and enjoyable
  • Formulated by veterinarians. Just one scoop per day contains the proper dosage for your cat or kitten to stay in peak health

See all items by Tomlyn

  • Item Number
  • Lifestage
    Adult, All Stages
  • Supplement Form

Nutritional Info


  1. Active Ingredients (Per Included Scoop): L-Lysinehydrochloride 500 mg. Inactive Ingredients: Brewer's Dried Yeast, Dried Whey, Hydrolyzed Fish (Enzymatic), Hydrolyzed Poultry (Enzymatic), Lecithin, Mixed Tocopherols (a Preservative), Rosemary Extract, Sodium Acid Pyrophosphate, Soybean Oil.

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Customer Reviews

Tomlyn Immune Support L-Lysine Powder Cat Supplement is rated 4.6 out of 5 by 96.
Rated 5 out of 5 by from Clears up 'the crusties' I was looking for a product to help the cats we have who have allergies. In the past, they've developed what the vet calls "the crusties" on their backs and would receive an allergy vaccine about every 2 months. They eat good quality food so we didn't know what else to do. Within a month of sprinkling the l-lysine on their food, the crusties are gone. If a cat needs a larger dose than on their food it's easy to mix with water in a syringe and give them. They love the flavor. This product is saving us a ton in vet bills as well as no stress in giving it to the cats. It does take several weeks to work, but that's to be expected because it takes time for any kind of sore to heal. So glad we found this product and at such a good price. It's supposed to help FIV+ cats as well and our one FIV kitty loves it too.
Date published: 2016-12-25
Rated 5 out of 5 by from Fantastic Product for Immune Support! I have cats infected with the feline herpes virus (FHV) and they occasionally get "kitty colds" that manifest as runny eyes, sometimes nose. I have an 18 year old that this was nearly fatal for, as he would get extremely sick, and a young one who is also FIV positive, so an FHV flare can be serious. I keep everyone on lysine daily (1/4 tsp for the high risk, 1/8 tsp for everyone else) and it keeps the FHV flares away, almost 100%. Neither of the high risk has flared since maintaining this regimen and I've only had two very brief flares of eye discharge among the others. Given that most domesticated cats have now been exposed to FHV, this supplement is a must have!
Date published: 2017-02-20
Rated 5 out of 5 by from Good lysine. I use this every time I feed my cats. It helps fight off the herpes virus. It also helps my cat that has a skin condition. Cats love the flavor of it.
Date published: 2016-12-29
Rated 5 out of 5 by from Hey You is doing well on this My elderly cat has feline herpes that has effected his eyes. We have tried drops and antibiotics. The antibiotics helped but he has to have drops daily to keep it in control. He does not allow us to put drops in his eyes - claws - bites - runs away. In order to get drops in his eyes we had to take him to the vet everyday which stressed him as much as trying to medicate him at home. I decided to try L-Lysine to help. After a month I do see improvement. It can be mixed in his food, and he doesn't even know it is there.
Date published: 2017-02-06
Rated 5 out of 5 by from Easy to Use and All My Cats Eat It I have 4 cats and I give it to all of them. One of them, for sure, has Feline Herpes so I started this as a preventative and an immune boost for my 2 white cats. My oldest cat (14) doesn't like the powder. So, I dissolve it in a bit of water so there is no grit. Once I did that, she had no problem eating it. The rest of them eat it just fine. I just add it to their wet food and mix it in. Easy peasy and my cats take it in stride. :-)
Date published: 2017-01-29
Rated 5 out of 5 by from LIke that I can give this to my cat My cat likes it and that's a plus, hopefully it will do its job.
Date published: 2017-02-06
Rated 5 out of 5 by from Great for feline herpes After adopting a cat from a local shelter, it appeared he brought with him the feline herpes virus. I took him to the vet and bought anti viral meds but they only lasted for as long as the prescription was for. A lot of cat sites mentioned L-Lysene so I tried it. I LOVE IT! 1/2 scoop twice a day and he has not come down with any symptoms since. I could not be happier!!! Thank you. And Chewy's reps are nicer than nice!!!
Date published: 2017-02-20
Rated 4 out of 5 by from Feral cat My feral cat had such a horrible cold and I needed something I could put in his food, he's not a very "friendly", seemed to help. He's all better now.
Date published: 2017-02-03
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