In Mexico, or Spain for that matter, garlic tea is served up for coughs or colds. People swear by it! The garlic oils inhibit cough and cold microbes, and they are effective decongestants. Lemon juice reduces and thins mucus, which makes it easier to unclog a stuffed up respiratory system. Lemon juice also changes the body's pH, making it less hospitable to viruses and bacteria. Adapted from Prevention magazine.