This. If I take it at the first inkling of illness, like a scratchy throat or that tired, run-down feeling, it seems to work in a few hours. If I take it when I'm already stuffy or have a fever, it is less effective and needs a couple of doses over a couple of days. Also, take it with food (vs an empty stomach) to avoid the bathroom runs.

This. If I take it at the first inkling of illness, like a scratchy throat or that tired, run-down feeling, it seems to work in a few hours. If I take it when I'm already stuffy or have a fever, it is less effective and needs a couple of doses over a couple of days. Also, take it with food to avoid the bathroom runs.