• 6-PACK Felisyl Immune System Support (360 Soft Chews)

6-PACK Felisyl Immune System Support (360 Soft Chews)

SKU: 5939-6PK
Regular Price: $97.99Sale Price: $53.99
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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
My "go to" Lysine chews by Heidibear03/25/2013

I have rescue cats and some have "eye" issues and benefit from Lysine. Well, there are many forms of Lysine out now, thank goodness but all of the ones my cats are supposed to like...they don't! They are so difficult!! Anyway, These chews are the most moist you can get and are easy to chew. I just widh they had more Lysine per chew, and for that I would add the 5th star! Can't have it all though huh? Thank you!

by Anita03/16/2013

This is an excellent product but the last couple of batches have been hard not soft and my cats won't eat it....I sent emails about that and they are supposed to be sending some out to replace the last ones I got...but this batch is hard too....

One of the Best purchases ever. by BABS from FL12/08/2012

My Cat Lilly is doing good on this product her sniffles and sneezing are lessoning. It is much easier to give her the treat. Though I must cut it in three pieces and put it with some of her other treats. Its much simpler to get her to eat her immune support soft chew. That is why I reordered 6 more packages. She is currently doing well on 3 treats a day. She is also much more alert and active. with her upper resputory illmess.I would recommend this product to other cat lovers. Try it.

by from 04/24/2013

Last winter I purchased a three pack. My cats loved them. They were "fish" flavored, dark colored and moist. I recently received a six pack shipment. These are chicken flavored, beige tan and harder. All three cats turn up their noses and walk away.

the by formulation? from IWhat


wonderful by Neeter06/11/2012

Our cats really love them...no trouble getting them down...great for when I am not feeding wet food...


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
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