Fera Pets Lysine Immune Powdered Supplement for Cats, 2.1-oz jar

Skip image gallery
Slide 1 of 9

At a Glance

  • No Corn No Wheat No Soy
  • Immune Support
  • Made in USA
  • All Lifestages
$14.97 First Time Autoship Price
this order
Save 50% (up to $20) today when you set up Autoship. 
$28.45 Autoship Price
(-5%) future orders
  • Keep saving 5% on every order
  • Get deliveries on your schedule
  • Skip, change, or cancel anytime
$29.95 Chewy Price
($14.27 /oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card + Free Shipping with code: WELCOME
In Stock
FREE 1-3 day delivery on first-time orders over $35
Free 365-day returns

No interest if paid in full in 6 months on PayPal purchases of $149+. .

About This Item

Details

  • Each serving provides 500 mg of L-lysine plus botanicals, polyphenols, antioxidants, and postbiotics for comprehensive immune support.
  • EpiCor Pets postbiotic helps balance the gut microbiome to promote a strong and healthy immune system.
  • Perfect for indoor and outdoor cats, this supplement promotes immune and respiratory health while supporting cellular defenses and eye function.
  • Antioxidants help maintain a normal inflammatory response.
  • Provides daily immune support for cats of all ages.

Ingredient Information

Instructions

Tested for Purity. Backed by Science.

Every Fera supplement is NASC certified, made in the USA, 3rd-party tested for safety and potency, certified plastic neutral, and crafted with traceable ingredients. Join us as we set the new standard for pet supplements.

Vet Founded & Formulated

Vet-founded and formulated by Dr. Dulake, Fera Pets combines clinically studied, traditional ingredients with new, innovative ingredients to ensure your pets get the holistic support they need to live happier and healthier lives.

Strong Immune Health for More Purrs

This easy-to-give powder combines Lysine, EpiCor Pets Postbiotic, Echinacea, and antioxidants to promote immune &, respiratory health, gut balance, and eye function. Each jar contains 60 scoops for 60 days of daily care.

More Than Just Lysine

Many supplements offer only Lysine. Ours delivers 500 mg of Lysine plus botanicals, polyphenols, antioxidants, and postbiotics for total immune support. No fillers. Just active, clinically studied ingredients for cats of all ages.

Frequently bought together

Questions & Answers

4 Customer Questions

How many servings are in a container?

Answer by Chewy • Jun 01, 2025
Each container contains 60 scoops.

Does this cause drowsiness?

Answer by Chewy • Oct 29, 2025
This supplement is not known to cause drowsiness.

What flavor is this?

Answer by Chewy • Jan 15, 2026
The Fera Pets Lysine Immune Powdered Supplement for Cats has a chicken flavor.

Are there any known side effects with this?

Answer by Chewy • Jan 13, 2026
This supplement should not be used with blood thinners. Please consult with your veterinarian for further guidance if needed.
Reviews
Write a Review
4.0
Rated 4 out of 5 stars
111 Ratings
Terms & Conditions

53 Customer Reviews

Rated 5 out of 5 stars
By Cheyenne on Jan 14, 2026

Noticeable difference in days

I’ve been using the Fera Pets Lysine Immune Powdered Supplement for my cat, and honestly I’m really impressed. My girl has always struggled a bit with sneezing fits

I’ve been using the Fera Pets Lysine Immune Powdered Supplement for my cat, and honestly I’m really impressed. My girl has always struggled a bit with sneezing fits and watery eyes, especially during seasonal changes, and nothing ever seemed to help long term. I decided to try this lysine powder and I’m so glad I did. It’s super easy to use, the powder is really fine and mixes into wet food without any issues. My cat is extremely picky and usually notices when I add anything to her meals, but she didn’t mind this at all. No weird smell, no weird texture. Within about a week, I started noticing her eyes weren’t tearing as much and she wasn’t sneezing nearly as often. She also just seemed more comfortable overall. An unexpected bonus: her coat even looks a little shinier and healthier. I also like that it’s a clean product with simple ingredients, which makes me feel better about giving it daily. The 2.1-oz jar has lasted longer than I thought it would, so it’s definitely a good value. If you have a cat with immune or respiratory issues, or you just want something to support their overall wellness, I definitely recommend giving this a try. It made a real difference for us!

Rated 3 out of 5 stars
By Madissen on Jan 19, 2026

Hard to See Results

I received this for free in exchange for my review. My cat Sammy didn't want to touch his food when I put this in it at first. I had to put in effort to mask it

I received this for free in exchange for my review. My cat Sammy didn't want to touch his food when I put this in it at first. I had to put in effort to mask it with salmon oil to get him to consume it. After him using it for a few weeks, I can't say that I noticed any differences with him. Maybe changes will occur over long term use, but I didn't see it in short term use. Either way, this supplement is not something I'd recommend for picky cats because of the difficulty I had trying to get my cat to take this.

Rated 4 out of 5 stars
By Kristin on Jan 19, 2026

My picky cats like it

I’ve been using Fera Pets Lysine Immune Powder for my cat and it’s been a good experience. My cat likes it, which makes things so much easier. I mix it into her

I’ve been using Fera Pets Lysine Immune Powder for my cat and it’s been a good experience. My cat likes it, which makes things so much easier. I mix it into her food and she eats it without any problem. It blends in well and hasn’t upset her stomach. I started using it to support her immune system, and I like that it’s made for cats with simple ingredients. It’s easy to use and stress free, and I plan to keep using it.

Rated 4 out of 5 stars
By Victoria on Jan 5, 2026

No muss no fuss from Truffle

I’ve been using this Lysine Immune Powdered Supplement for my cats, and overall I’m really happy with it. The biggest plus is that my cats are not bothered by it

I’ve been using this Lysine Immune Powdered Supplement for my cats, and overall I’m really happy with it. The biggest plus is that my cats are not bothered by it at all. I simply mix it into their food, and they eat normally without hesitation. No smell, no fuss, and no change in appetite, which is a huge win for picky cats. It’s reassuring knowing they’re getting immune support without the daily struggle. The only downside is that it didn’t come with a scoop, so measuring can be a bit inconvenient at first. Otherwise, it’s an effective and easy supplement to use.

Rated 3 out of 5 stars
By Stacy on Dec 22, 2025

Mixed Reviews

As a cat parent to two very distinct personalities, our experience with Lysine Immune Powdered Supplement for Cats has been a mixed bag. Our confident, food-driven

As a cat parent to two very distinct personalities, our experience with Lysine Immune Powdered Supplement for Cats has been a mixed bag. Our confident, food-driven tabby, Nala, absolutely loves it; she dives into his wet food like it’s a gourmet meal and didn’t skip a beat when we started mixing in the powder. Over a couple of weeks, we even noticed she seemed less sniffly and had fewer irritated eyes during the change of seasons, which was a huge relief. On the other hand, Kiki, our sensitive and picky eater, was not impressed. Even a small sprinkle made him walk away from his bowl, nose in the air, and he’d rather starve than eat. We tried blending it into different meals, but nothing tempted him. Overall, the supplement seems to work well if your cat will actually eat it. Nala is living proof, but don’t be surprised if it’s a hard sell for a picky eater. It may be worth trying a small amount first to see how your cat reacts before committing to a full container.

Rated 5 out of 5 stars
By Caitlin on Jan 19, 2026

Great product!

We have a very picky male cat who has had skin issues now for years. Normally we have to mix every product into his food VERY well and he still sometimes turns his

We have a very picky male cat who has had skin issues now for years. Normally we have to mix every product into his food VERY well and he still sometimes turns his nose at them. He gave us no problems with this and ate his food just fine! It also seems to help his skin issues from worsening even when he is off his steroids. would definitely recommend this product!

Rated 2 out of 5 stars
By Fereshta on Dec 26, 2025

My cats unfortunately would not touch this

My cat has Feline Herpes so I need to give him a Lysine supplement regularly and it helps him keep his symptoms at bay. I was looking forward to using this Lysine

My cat has Feline Herpes so I need to give him a Lysine supplement regularly and it helps him keep his symptoms at bay. I was looking forward to using this Lysine powder and even sprinkled it on my cats fave treat, freeze dried salmon, but he wouldn’t touch it. My other cat didn’t want to try it either. It’s unfortunate because I really wanted it to work. I will have to keep using the Lysine gel that my cat will tolerate with his treat.

Rated 5 out of 5 stars
By Nicole on Jan 19, 2026

Happy Cats

Paisley is a picky eater but she took to this immediately. I mixed the powder into her wet food then added it to her dry and she ate it so fast and thinks of this

Paisley is a picky eater but she took to this immediately. I mixed the powder into her wet food then added it to her dry and she ate it so fast and thinks of this as an added treat now. Very good results and satisfied with this product. I highly recommend.

Rated 5 out of 5 stars
By Janny on Dec 25, 2025

This review is based on my personal experience.

I’ve been using this L-Lysine powder for my cat and it’s been easy to add to her daily routine. It mixes well with food and doesn’t have a strong smell, which really

I’ve been using this L-Lysine powder for my cat and it’s been easy to add to her daily routine. It mixes well with food and doesn’t have a strong smell, which really helps because my cat can be picky. So far, everything has been simple and stress-free. I like how easy it is to measure and use every day. Overall, I’m happy with the product and would recommend it to other cat owners looking for immune support.

Rated 5 out of 5 stars
By Jean on Dec 8, 2025

Excellent Supplement!

Just found the Fera Pets Brand recently while researching supplements for my furbaby kitties now that I am transitioning them to an organic whole food diet. Liked

Just found the Fera Pets Brand recently while researching supplements for my furbaby kitties now that I am transitioning them to an organic whole food diet. Liked their product line and was looking for a Lysine supplement with limited quality ingredients. So far so good as my boys didn't have any issues accepting it mixed in with their food. I split their doses between AM & PM meals and add a little warm water to mix it in with their food. No issues with their gut biome after 2 weeks of continuous use. Just ordered their Bladder Support Supplement and will review after a few weeks of use.