I was always getting colds and bronchitis too.

Immunity is the biggest difference I've seen on the diet - no constantly runny nose and blocked sinuses. Ive been feeling slighlty invulnerable this flu-filled season - knock on wood! (pride goeth before a fall!).

I usually take Right Herbals, ARA-6 & Thomas' "Immun-Calm" daily. I'll also pop some immune peptides, Oralmat drops, olive Leaf Extract and Moducare if things get hairy. A very interesting cold preventative is Zicam - a gelled zinc nasal spray. The first clinicals say it ends an 8 day cold in 1.5 days. Seems to be effective.