• 6-PACK Felisyl Immune System Support Granules (21 oz)

6-PACK Felisyl Immune System Support Granules (21 oz)

Regular Price: $65.99Sale Price: $53.99
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Felisyl® is a 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 catís body needs it, but canít 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 for Cats also helps maintain healthy tissue, supports respiratory health, and may even help with your catís vision. The L-Lysine is in a palatable poultry and fish flavored base making these granules easy to give to your cat, just sprinkle over or mix with food.

For Use In: Cats

Usage Information

Sprinkle measured amount over cat’s food and mix in. This product is intended for intermittent or supplemental feeding only.

Age of Cat Morning Evening
Under 6 months 1/2 Scoop 1/2 Scoop
Over 6 months 1 Scoop 1 Scoop


Guaranteed Analysis per (1 cc Scoop):
(All values are minimum quantities unless otherwise stated.)
Moisture (max) 1.1%
L-Lysine 78% (250 mg)
Ingredients: L-Lysine, Chicken Liver Powder, Fish By-Products, and Sugar.

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
It really makes a difference! by Rae from Memphis, TN04/27/2011

My Siamese cat has a bad case of herpes, because she was left untreated for so long before she was adopted which means she will always show some symptoms no matter how good the medicine is. We tried other brands of lysine powder and pastes that cost more money than the Felisyl, such as Viralys. None of them made the difference that Felisyl made for our cat. She has less frequent eye watering and sneezing compared to the other brands. She seems happier and more full of life!

by I don't have a nickname from North Carolina06/16/2013

Have used this before. It helps the immune system in kitties.

My Cats Love This by Karen from Outer Banks, NC04/01/2013

I have several rescued cats that take l lysine. This is the one product that they all love, I can just sprinkle it on their food and down it goes. One kitty won't even eat unless her food has it! highly recommend

by from 12/20/2012

I have four indoor kitties and we were constantly having upper respiratory infections. My vet suggested that I put them on Llysine to help with the symptoms. The cost was exorbitant to say the least. So I started looking around and found Entirely Pets.

best by supplement from IFelisyl


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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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