Yes, it does for allergies and colds. Just make sure you don't breathe while you are pooring the warm water through your nasal cavity. Don't try and force the water just let is flow in one nostril, out the other and over a sink. If you do you will end up with a sharp pain in your nose like water up your nose from swimming. As long as you don't breathe your nose will feel cleaned out and fresh. It feels like you are completely cleansing the nose and you can breathe again.