I swear by Airborne, the natural supplement to boost my immune system when I'm surrounded by coughing coworkers. I have used this product for about 2 years with very good results. Last winter the entire office came down with a horrible flu and cold where everyone called in sick at one point or another. As soon as I hear or see someone with any cold/flu symptons I immediately start taking the Airborne that is kept in my desk year round. I was the ONLY person that did not get sick last winter in our office. I also take this a few days before going on vacation, especially when flying. I like the fact that is a natural product and does not contain any medication. I recommend it to everyone, especially during the winter months when we are all cooped up inside and can't open our windows for fresh air. I am using the grapefruit flavor at the moment but my favorite is the lemon lime. Well worth the price unless you like to pay for doctor visits and prescriptions.