Airborne - mind over body?

I just heard that Airborne doesn't actually work. I remember always taking it at the first sign of a cold and it always seemed to work for me. I wonder if it's just a case of mind over body. I felt deep down it would prevent the cold from getting worse and it did. I wonder if I believed the same thing would happen if I took a spoonful of lemon juice, I'd get the same result?

I have always believed that your mind can help you get over certain ailments. I would still recommend seeing a doctor if it gets worse but having a positive outlook and even some placebo remedies can also help;)