Tums Ultra Strength Chewable Antacid Tablets is a powerful heartburn medicine specifically made for adults and children over 12 years old. It goes to work in seconds and starts neutralizing acid on contact, providing fast and powerful relief with twice the power of Tums Regular Strength. Simply chew and swallow two to three tablets, depending on the severity of your acid indigestion, for quick relief. These 1000 milligram antacid tablets contain calcium carbonate, an active ingredient that can be found in nature, and aids in relieving heartburn, sour stomach, upset stomach associated with symptoms, and other acid indigestion. They are gluten and kosher free and comes with a satisfaction guarantee.