Airborne does not contain or have any caffeine in it so you can sleep better when you are sick.
If the Airborne flu and cold supplements had caffeine in it it would likely keep you awake and prevent you from sleeping properly.
And sleep and rest is essential to getting over your cold or flu or other sickness.
I take Airborne when I start feeling the flu or cold symptoms and most times after taking the Airborne cold and flu medicine I usually do not get the cold or flu or it goes away much sooner.
The airborne should be taken just when you start feeling the cold or flu coming on as it works best before the cold or flu has infected you.
However even after you have gotten the cold or flu virus taking Airborne can make you feel much better and speed of the recovery time of the cold or flu virus.