Yes! Use it 3-4 times over the course of the day (and up to 6 times a day), 2 sprays per nostril during each use. It is best to use before and after attending a high-risk environment (public transportation, day cares, health care settings, shopping centers, sport events etc.)
A clinical study conducted in Feb 2022 found that participants who took NONS after COVID-19 exposure were 75% less likely to become infected when compared to the control group.