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How to help sick feral cats recover from URIs and boost immunity?

Updated On September 23rd, 2025

Hi, I work with a large colony of feral cats and with the cold winter passing, many of them have developed upper respiratory infections. It is not warm enough to start trapping yet, so I am looking for something to boost their immune systems and help them recover from the URI's in time for TNR. From what I've read, vitamin C is safe for cats and can help their bodies heal. I am thinking of starting with 125-250mg of ascorbic acid powder. Id like confirmation that it is safe for them. Thanks!

1 Answer

Most Helpful Answer

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Answered By Dr. Elizabeth

Veterinarian

Published on April 2nd, 2019

The jury is still undecided if Vitamin C really helps pets or not. Cats synthesize their own vitamin C naturally. Likely the best measures you can take are to support over-all health. Make sure they are eating a high quality cat food. Deworm them if possible. Many cats respond well to Lysine for herpes infections. Adults take 500mg twice daily. This can be found in a fish flavored powder, gel and treat form. Also giving them an omega 3 fatty acid supplement for cats will help with natural inflammation control. I hope this helps and please feel free to post any additional questions.

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