Using a povidone-iodine nose spray four times a day for 5 days might help reduce how bad a common cold feels by about 12.6% compared to a saltwater spray, but the results weren't quite strong enough to be sure.

Using Nasodine spray doesn't really shorten how long a common cold lasts—it takes about 10 days to get better, just like using a simple saltwater spray.

If you take Nasodine medicine soon after you start feeling sick with a cold, it can make your symptoms much less severe. Getting treated early is really important for it to work well.

This says that a nasal spray called Nasodine helps people with colds feel better in their daily lives. It claims that using Nasodine makes people 16% more comfortable compared to using a simple saltwater spray.