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What helps boost a cat's immune system after cat flu recovery?

Updated On September 23rd, 2025

Pet's info: Cat | Maine Coon | Male | neutered | 4 months and 13 days old | 10 lbs

Hi, what would be the best to use for boostin my cat immune system? He just recovering from cat flu.It was a struggle. Actually got to the point where I had to get my cat tested for Felv. Was all negative . My vet reckons he probably got weak immune system . He gave me a liquid that "suppose" to boost his immune system but it gives him bad diarrhea so I decided to go with something natural like cod liver oil . Im just not sure if it's beneficial at all or what else would be working for this.

1 Answer

Most Helpful Answer

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Answered By Jacqueline Nobles, DVM, DACVECC

Veterinarian, Board-Certified Emergency/Critical Care Specialist

Published on July 25th, 2017

Hello, Feline upper respiratory infection can be caused by a number of viruses and is seen frequently in younger cats. To my knowledge, we have no evidence to support the use of liver cod oil as a immune booster. Historically, we have recommended L-lysine added to the diet or even treats for cats with herpes infection. However, even the scientific evidence supporting the use is lacking. The best thing to do is feed Leo a good diet, avoid exposure to young, non-vaccinated cats, and follow up for yearly wellness exams, vaccines, and parasite prevention.

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