The reason you got stuffy nose is b/c you developed allergy to to GSE. Similar to the case pollen comes into contact with receptors in your nose, you develop allergy to pollen. And after you develop allergy by injecting Grapefruit-Seed-Extract to your nose, it 's irreversible and couldn't be cured. From then on, every time you eat something which had the chemicals similar to GSE, you will get stuffy nose b/c your body recognize those chemicals and it tries to create mucus. So be careful before injecting anything to your nose.