3PACK Felisyl Immune System Support (10.5 oz) by Pet Health Solutions is a brand new nutritional supplement that is safe and effective for conditions responsive to Lysine. Llysine reduces the severity and frequency of herpes simplex viral infections which are also known as cold sores or fever blisters. In cats, herpes virus is not sexually transmitted. It is a highly contagious and extremely common cause of upper respiratory infections, or URIs. URIs are marked by eye discharge, squinting, sneezing, and and sinus congestion. Lysine has been proven to reduce the severity and duration of feline herpes virus infections in your cats. Felisyl is a palatable nutritional supplement for cats and kittens and should be mix with your pets food at feeding time. LLysine HCL Oral Powder for CatsAdministration: Approximately 250 mg of LLysine per one rounded scoop (322 mg). Mix appropriate dosage with cat food at feeding time. Age of Cat Mix with Food under 6 months 1/2 scoop twice daily 6 months over 1 scoop twice daily Guaranteed Analysis Per Scoop LLysine HCL 250 MG Ingredients: LLysine in a palatable base.