Fast and lasting relief from heartburn When stomach acid flows back into the esophagus, it causes heartburn, a sharp pain behind the breastbone. It is often accompanied by acid reflux. Causes can include fatty foods, sweets, and fruit juices, as well as being overweight. HOW IT WORKS: The natural remedy Luvos Healing Clay Ultrafine Acute provides fast and effective relief from heartburn symptoms: The capsules contain healing clay, which consists of an ideal blend of minerals and trace elements. This clay binds excess acid. No side effects are known.