In Each Chewing Piece: Other Information: Each Piece Contains: Calcium 300 mg. Store at room temperature. Avoid humidity and excessive heat above 40 degrees C (104 degrees F). Calcium carbonate/antacid. Works fast! Heartburn relief. How it Works: Chew gum; start neutralizing acid in seconds; feel minty fresh. how2recycle.info. Questions or comments? 1-800-986-0369 (Mon-Fri 9AM-5PM EST). Product of France.