Medicinal gum can boost the immune system. Want another reason to chew gum?Fertin Pharma produces a medicinal gum that's designed to help boost the immune system. Each piece has over 30 percent of the daily recommended amount of vitamin C and zinc. Thomas Jahn, the marketing manager at Fertin Pharma said: “It’s a product you take when you’re beginning to feel the onset of a cold. It’s designed so you take three pieces a day.” Fertin Pharma also makes gum that is marketed to relieve stress, called SaffraGum. The stress relief gum contains a saffron extract and vitamin B12. Another chewing gum was in the news lately. Wrigley suspended one of their products that contains caffeine just over a week after it was released. Alert Energy Caffeine Gum contained 40 milligrams of caffeine in each piece, which is equivalent to about half a cup of coffee. Wrigley announced that production, sales, and marketing of the product will be temporarily discontinued. The Food and Drug Administration is investigating the expanding market of products that contain caffeine.