Antioxidant: Beverages, candy, ice cream, baked goods, yogurt, gelatin desserts, baking powder.
Tartaric acid occurs naturally in grapes, other fruits, and coffee beans. It has an extremely tart, acidic taste, which is useful in some foods. Most of the tartaric acid we ingest is digested by bacteria in the intestines. The 20 percent that is absorbed is rapidly excreted in the urine.
When tartaric acid is partially neutralized with potassium hydroxide, the result is potassium acid tartrate, or cream of tartar.