Skip to main content

Felisyl Immune System Support Soft Chews

This page contains information on Felisyl Immune System Support Soft Chews for veterinary use.
The information provided typically includes the following:
  • Felisyl Immune System Support Soft Chews Indications
  • Warnings and cautions for Felisyl Immune System Support Soft Chews
  • Direction and dosage information for Felisyl Immune System Support Soft Chews

Felisyl Immune System Support Soft Chews

This treatment applies to the following species:
Company: PHS

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.

Product Facts

Guaranteed Analysis per (Soft Chew):

(All values are minimum quantities unless otherwise stated.)

Moisture (max)



16.6% (250 mg)

Ingredients: L-Lysine, Natural Chicken Liver Flavor, Oat Flour, Rye Flour, 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).

For Use In:


Feeding Directions:

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.

Store in dry place. Keep container at room temperature (59°F-86°F). Manufactured in the USA, made within an FDA and USDA approved facility following current National Sanitation Foundation certified Good Manufacturing Practices (NSF cGMP) under strict quality control specifications.

For animal use only. Keep out of the reach of children and animals. In case of accidental overdose, contact a health professional immediately.

Product Website:

Distributed by PHS, Inc., 1684 Decoto Rd., Suite 200, Union City, CA 94587

60 Soft Chews (60 Doses)


CPN: 6210062.0

34501 7TH ST., UNION CITY, CA, 94587
Toll-Free:   877-564-6862
Every effort has been made to ensure the accuracy of the Felisyl Immune System Support Soft Chews information published above. However, it remains the responsibility of the readers to familiarize themselves with the product information contained on the US product label or package insert.

Copyright © 2022 Animalytix LLC. Updated: 2021-11-29