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3-PACK Felisyl® Immune System Support (180 Soft Chews)

SKU: 5939-3PK
Regular Price: $50.99Sale Price: $27.99
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Felisyl® is a soft chew supplement that contains the amino acid L-Lysine for use in cats and kittens for conditions responsive to L-Lysine. L-Lysine is an essential amino acid, which means that your pet's body needs it, but can't produce it, so this supplement is a perfect choice to provide that necessity.

L-Lysine HCL Immune System Support for Cats helps keep your cat healthy by supporting the immune system naturally so that it can function normally and produce antibodies. Felisyl L-Lysine HCL Immune System Support Soft Chews for Cats also helps maintain healthy tissue, supports respiratory health, and may even help with your cat's vision. The L-Lysine is in a chicken liver flavored soft chew making it easy to give to your cat.

For Use In: Cats

Usage Information

Feed soft chew directly to cat or crumble over food. This product is intended for intermittent or supplemental feeding only.

1-2 soft chews daily.


Guaranteed Analysis per (Soft Chew):
(All values are minimum quantities unless otherwise stated.)
Moisture (max) 8.6%
L-Lysine 16.6% (250 mg)
Ingredients: L-Lysine, Natural Chicken Liver Flavor, Oat Flour, Rye Four, Soy Lecithin, Brewers Dried Yeast, Water, Arabic Gum, Glycerin, Canola Oil, Maltodextrin, Sodium Alginate, Calcium Sulfate, Citrus Pectin, Oat Meal, Sorbic Acid (preservative), Propionic Acid (preservative), and Mixed Tocopherols (preservative).

Customer Reviews

DISCLAIMER: The results described on the testimonials on this site, are the individual experiences and personal opinions of those who have purchased and used the products. These testimonials are not intended to make any claims that the products can be used to diagnose, treat, mitigate, cure or prevent any disease or medical condition.
Click here to see all reviews
4.33 rating based on 9 reviews
by from 02/06/2014

Used as therapy treatment for my Tuxedo who was exposed to Feline Herpes as a kitten.

each by chew from wasWorks


My cats love it by Ely03/19/2013

I have two cats with herpes of the eye and both are happy to take 1 tab each am and pm.

GREAT discovery by Carol from Ft Lauderdale Fl05/30/2012

The cats don't know there's medicine in the chews, they think its a treat! They eat them up fast. I try and hide an Anixtane tablet in between 2 of the chews. Someone should make a pill pocket out of the soft chews.

Helped my cat a lot! by RaIrCo2412/06/2012

My cat had sores from her feline herpes and Felisyl helped a lot to let them heal and go away. Glad I purchased this.

Felisyl L-lysine by Joan from Michigan01/02/2012

I have used L-lysine for my cats with eye issues for about 2 years. I recently found this product and use is regularly as it keep their eyes clear and helps with irritation from herpes virus. This product is soft so was helpful for my friend who has an elderly cat who does not tolerate the hard treats. He also has had success with this product. I strongly recommend!

SERVICE by Cindy01/17/2015

After not receiving the product for weeks after my order this time...I called and was told it was back ordered with no expectation of delivery date. I cancelled the order and went to 1-800-pet meds. My cats needed that and it was detrimental to their health to have had to wait without any idea it was not available !!

Most Economical by Cindy from South Carolina11/01/2013

My vet had quoted me an outrageous price for Lysine when my cats came down with a herpes virus. This product keeps them symptom free at a fraction of the cost!

by from 02/23/2012

I recently purchased 3 packs of the Felisyl Immune System Support upon the reccomendation of my vet. Allof my 5 cats enjoy them and come running when I open the bag. It's still too early to determine the full effect, but I'm planning to keep feeding this product as a part of their daily diet.

Drexel Hill, PA by from Rob"


by Mar from Loudon,TN12/01/2011

I am giving the Felisyl lysine to 2 of my cats. They are not crazy about the treats but will eat them & that is all I ask. Too early to tell if lysine is helping the herpes.

he won't eat them... by puzzled1 from new york city09/11/2014

even if I break them up into tiny pieces. They're not soft enough for my old guy. I found another brand that are softer and he'll eat those.

My Cats Do Not Like These by Christine01/29/2013

I thought I would try these Lysine Treats becasue the price was much better than the Enisyl-F Lysine Treats. My one cat will not eat them & my other cat throws them up right after. I would not recommend them if you cat is picky or has a sensitive stomach.


Questions and Answers

NASC Certified

This product has met all of the stringent quality and safety standards set by the NASC.

The NASC (National Animal Supplement Council) is a non-profit self regulatory group that set specific guidelines to which manufactures must strictly adhere.

This seal is meant to minimize risk by providing an easy way of communicating to consumers that a product and its manufacturer meet particular standards of quality, customer safety and service.

Those products that have the seal for NASC Quality and Safety standards have been strictly audited and were determined as meeting the following criteria:

  • Consistent manufacturing quality control
  • A system for evaluating complaints and adverse events
  • Clear and accurate labels compliant with codes and restrictions for all forms of labeling
6-PACK Felisyl® Immune System Support Granules (21 oz)6-PACK Felisyl® Immune System Support Granules (21 oz)
Reg price: $65.99
Sale price: $53.99
Felisyl® Immune System Support (60 Soft Chews)Felisyl Soft Chews
Reg price: $24.99
Sale price: $9.99
6-PACK Felisyl® Immune System Support (360 Soft Chews)6-PACK Felisyl® Immune System Support (360 Soft Chews)
Reg price: $97.99
Sale price: $53.99
Felisyl® L-lysine Gel for Cats (5 oz)Felisyl® L-lysine Gel for Cats (5 oz)
Reg price: $14.99
Sale price: $10.99

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