New vivarin caffeine gum gives you a caffeine boost anywhere, anytime you need. it. Bursting with minty powermint flavor, each piece of vivarin caffeine gum. contains 40mg of caffeine, is sugarfree, and only 5 calories. Vivarin caffeine. gum goes where you go and gives you the extra boost when you need it. Vivarin. caffeine gum is not intended for those under the age of 18, pregnant and. nursing women or people sensitive to caffeine. Like all caffeine-containing. products, this product should be enjoyed in moderation. Do not chew more than. 2 pieces of vivarin caffeine gum at one time. Maximum 6 pieces of gum per day. Fda recommends it is best not to consume more than a total of 400mg of. caffeine per day, in any form. Must be stored out of reach of children.