TUMS® Antacid Smoothies™ Berry Fusion Extra Strength. Calcium carbonate. Smooth dissolve. Chewable tablets. Uses relieves: Heartburn. Acid indigestion. Sour stomach. Upset stomach associated with these symptoms. Each tablet contains: Elemental calcium 300mg. Gluten-free. Questions Call 1-800-897-7535, Weekdays. © 2014 GSK.