I may get blasted for saying this, but I don't believe in Airborne. I think it's more mental than anything. I don't believe it hurts, but it's just some vitamins in an effervescent form. I can get vitamins anywhere. I've had to laugh at the labelling--it should be trusted because it was developed by a schoolteacher!?? Now, I have respect for schoolteachers, and I know they are exposed to colds more than many are, but I don't remember them receiving any particular training in biochemical engineering or medicine! Sorry, not buying into it.
Zicam, on the other hand, I do have more faith in. I spoke with my pharmacist about it and he said that tests have shown zinc to shorten the common cold. He had also seen studies that showed that zinc seemed to have better absorption nasally than if taken orally, so I started using the nasal kind of Zicam, and found it to be quite helpful.