Prelief is a supplement based on calcium glycerophosphate that is designed to be taken with acidic foods such as coffee, wine, fruit juice & tomato sauce. Prelief is a dietary supplement for use with acidic drugs, acidic foods & beverages. It is a dietary intervention used to reduce the acid of these ingestibles for persons who identify acid discomfort. Ingredients: Active Ingredients: Per 2 Tablets (680 mg): Calcium 130 mg; Phosphorus 100 mg; Calcium Glycerophosphate; Magnesium Stearate. Directions: Swallow 1 to 2 tablets when you eat or drink any acidy food or beverage. Use Prelief as often as you like, any time of day or night. The best time to take Prelief is when you start to eat or drink. People who have been advised by their physician not to take calcium, phosphorous or glycerin/glycerol should consult with their physician before using Prelief.