STRAWFIELD PETS L-Lysine Immune Support Cat Supplement, 7-oz jar -

Strawfield Pets L-Lysine Immune Support Cat Supplement, 7-oz jar

By Strawfield Pets
Rated 4.3396 out of 5 stars

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$19.95Chewy Price
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Top IngredientsL-Lysine Hydrochloride 900 mg.Active Ingredients: L-Lysine Hydrochloride., Inactive Ingredients: Citric Acid, Edetate Disodium...Active: L-Lysine Hydrochloride: 250mg per 1.25 mL., Inactive: Citric Acid, Edetate Disodium...Active Ingredients: (Per Included Scoop) L-Lysinehydrochloride 500 mg., Inactive Ingredients: Brewer's Dried Yeast, Hydrolyzed Fish (Enzymatic)...Active Ingredients: L-Lysine, N, N-Dimethylglycine HCl (D mg)....
LifestageAdult, Senior, KittenAdultAdult, Kitten, SeniorAdult, Senior, KittenAdult, Senior, Kitten
Food FlavorChickenMolassesChickenChicken, Liver, Poultry, Meat
Health FeatureImmune Support, Respiratory Care, Eye CareImmune SupportImmune Support, Respiratory Care, Eye CareImmune SupportImmune Support
Special DietGrain-Free, No Corn No Wheat No Soy
Food FormSupplementSupplementSupplementSupplementSupplement

About This Item


  • Powder supplement designed to boost the overall health of your feline friend.
  • Helps with feline herpes and immune system function in your paw-tner.
  • Treats cough, sneezing, runny nose, congestion and colds in adult and senior cats as well as upper respiratory infections.
  • Prevents and treats eye infections and works great for kitten eye infection treatment.
  • Natural chicken liver flavored powder ideal for kittens, adults and senior cats of all breeds.

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Nutritional Information

Feeding Instructions


Questions & Answers

8 Customer Questions

Where is this sourced?
Answer by ChewyDec 13, 2019
Strawfield Pets supplements are manufactured in the USA and ingredients for the L-Lysine supplement are sourced in the USA.

Does weight of the cat matter? Per the instructions it's one scoop per day, but I'm worried about overdosing.
Answer by ChewyJul 16, 2020
This supplement is not based on weight. For maximum support, you must use one scoop daily. Use one scoop at meal time in AM or PM. Mix well by shaking bowl after sprinkling over food.

Is these safe for breast feeding cats?
Answer by ChewyMar 13, 2020
This supplement is suitable for nursing cats.

How much lysine per scoop
Answer by ChewyOct 31, 2022
There are 900 milligrams of L-Lysine Hydrochloride per 1 scoop (1 gram).

ReviewsWrite a Review

Rated 4.3396 out of 5 stars
53 Reviews
Would recommend to a friend

53 Customer Reviews

Filter by reviews that mention

Rated 1 out of 5 stars
By Michelle on Dec 28, 2022

They hate it

I bought this when the brand the vet gave me was almost gone. It had good reviews and honestly didn’t think there would be a difference from what the vet supplied me with. Boy was I wrong. I typically mix it in with their wet food they eat in the morning and right before bedtime. Couldn’t figure out why they suddenly stopped eating their wet food until the other night I accidentally forgot to add it to their food and they ate their entire bowl. Then it clicked. I’m disappointed because my little girl eats about anything so I find it strange. It also smells tasty so not sure what it is about it they don’t like. Thankfully after digging deeper into Chewy I did find that Chewy does sell the brand the vet gave me so I will be ordering it. Just wished I’d realized it before buying this one.

Rated 5 out of 5 stars
By Rbddhun on Dec 27, 2022

It helps my cat who does not take medicine

It helps my Cat and he loves the flavor. Recommend by my veterinarian

Rated 5 out of 5 stars
By Chelsea on May 26, 2022

Awesome Immune Support!

When I adopted my kittens last October, I was told one was recovering from a cold. two months later, he was still sneezing all the time. The vet told me it was something he would have all his life and it would probably flare up from time to time--but I had never seen it flare down! After desperate googling, I came across L-Lysine, but my picky kitten didn't want the treats from other brands (they just sit on the floor...), and I didn't want to feed him something with a bunch of junk in it anyway when all I wanted was the L-Lysine. This was the holy grail! I mix it into my cats' wet food daily. He hasn't sneezed in months. I was a little panicked when Chewy went out of stock on this just as I ran out--so happy that it's back in!

Rated 5 out of 5 stars
By KimP on Jul 21, 2022

It works great

I have 8 cats that I feed a mix of wet and dry food in the morning and I mix it the main bowl. I also mix some in the main food bowls around the house. Half of them have upper respiratory issues. Since using this it has helped very much.

Rated 5 out of 5 stars
By 4eevah on Apr 30, 2022

I never want to run out

This stuff helped my cat get over her viral infection quickly. I started giving it to her in March and in 4 weeks her breathing was almost silent. She's been healthy since. When will this product be back in stock!?? Please bring it back soon so there's interruption in my cat's immune support.

Rated 4 out of 5 stars
By Skittles on Mar 31, 2022

He will eat it!

This is the fourth L-Lysine product I've bought and the first my cat will eat. In fact, the other 2 cats without eye issues would also not eat the 2 chewables and 1 gel-type products previously bought. This powder is very easy to mix in his food unlike trying to crumble and disguise the chewables into his food. Still waiting to see if there's any improvement in his eyes.

Rated 4 out of 5 stars
By RosiesMomma on Feb 23, 2022

Palatable Alternative

Our 17-year old cat has benefited from another L-Lysine supplement for several years. However, the "chewable" treat style I was giving her comes, more often than not lately, very hard and dry so she refuses to eat it. In studying the product information more thoroughly, I found that some components of the "natural" product we were using are from China - which is exactly what we were told by our vets to avoid when she began having health problems seven years ago. This was recommended by a Chewy vet as being completely sourced and made in USA... so far, so good.

Rated 5 out of 5 stars
By dapooh1 on Mar 6, 2022

Highly Recommend for FIV felines

Recently took in a stray cat that is FIV immune compromised. He’s had a respiratory infection with watering eyes and sneezing. After about a week on this supplement he’s getting better and not sneezing anymore. Thrilled this is helping him! Highly recommend for anyone with an FIV feline.

Rated 5 out of 5 stars
By kellbells on Mar 14, 2022

made a difference

I started using this in my female cats food. It has made such a difference with her. She is more active and eats much better. She is picky about her food. And adding this to her food she doesn't notice it.

Rated 5 out of 5 stars
By JenV on Jan 9, 2022

Great Stuff

Vet wanted me to get my rescue Snowshoe on Lysine for her respiratory issues. Unfortunately, the treat type I picked up from the vet did not go over well. This cat does not like cat treats, so I was stuck breaking them into tiny pieces and hiding them in her food, two in the morning and two at night. This powdered form was exactly what I needed. Instead of having to try and trick the cat into eating four giant treats a day - one scoop of this in her morning cat food and it went down with no problem. Will definitely be a repeat customer.