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3-PACK Felisyl L-Lysine Immune System Support Granules for Cats (10.5 oz)

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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 cat'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 for Cats also helps maintain healthy tissue, supports respiratory health, and may even help with your cat's vision. The L-Lysine is in palatable poultry, and the flavored fish base was making these granules easy to give to your cat, sprinkle over or mix with food.

Key Benefits:

  1. Enhanced Immune Function: Lysine is an essential amino acid that plays a crucial role in supporting the immune system of cats. Felisyl L-Lysine granules provide a concentrated source of L-Lysine, which helps strengthen the immune response, making cats less susceptible to various viral and bacterial infections.
  2. Cold Sore and Feline Herpes Relief: Lysine is commonly used to manage feline herpes virus (FHV-1) infections, which can cause symptoms such as cold sores, sneezing, watery eyes, and nasal discharge in cats. Felisyl L-Lysine granules help alleviate these symptoms and reduce the severity and duration of FHV-1 outbreaks.
  3. Support for Respiratory Health: FHV-1 infections often affect the respiratory system in cats. By boosting the immune response and reducing viral replication, Felisyl L-Lysine granules can help improve respiratory health, decrease congestion, and alleviate breathing difficulties associated with respiratory infections.
  4. Minimizes Lysine Deficiencies: Some cats may have dietary deficiencies or require additional lysine due to various factors, such as stress, poor appetite, or certain medical conditions. Felisyl L-Lysine granules ensure an adequate supply of lysine, which is essential for the production of proteins, enzymes, and antibodies, thereby supporting overall feline health.
  5. Palatable and Easy to Administer: Felisyl L-Lysine granules are typically flavored to be palatable for cats, making them easier to administer. The granules can be sprinkled over food, mixed with wet food, or given directly to the cat. This convenience allows for hassle-free supplementation.

It's important to note that while Felisyl L-Lysine Immune System Support Granules provide valuable support for feline health, it's always recommended to consult with a veterinarian before starting any new supplement regimen for your cat. They can provide specific guidance tailored to your cat's individual needs and overall health.

Immune Support for Cats

Fuel your pet with the supplements they need to remain healthy and boost their immune system with cat health supplements that add much-needed nutrients and amino acids to continue being active.


L-Lysine is an essential amino acid that your pet?s body doesn?t produce, so this supplement is the perfect aid that helps support your pet?s immune system so that it can function normally and produce antibodies. L-Lysine also helps maintain healthy tissue supports respiratory health.

Pet Health Supplement

A healthy immune system and eye health are essential for cats of any age. Ensure your furry friend remains active with healthy vision with these pet health supplements that help support normal inflammatory response and help support cat-eye health.


Guaranteed Analysis (Per 1cc Scoop):
L-Lysine HCI 250mg


L-Lysine in a palatable base

Useful Information

Approximately 250mg of L-Lysine per one rounded scoop (322mg)

Kittens under 6 months: ½ Scoop twice Daily

Cats older than 6 months: 1 scoop twice daily

Store in a cool, dry place, out of the reach of children. Keep tightly shut to preserve freshness.

Customer Reviews

1 Reviews
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By nicole s.
3 pak Felisyl
June 15, 2010
This does not seem to work as well as the Viralys Vet Solution.I would not purchase again even though the 3 pak seems to be a bargain.

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