Cinnamon (Cinnamomum cassia) It helps dry dampness in the body and warms people that are always cold and suffering from poor circulation. Cinnamon is another natural remedy for digestive problems including GERD. It works in part by reducing stomach acid, but it also has antibiotic and antifungal properties . Other folk traditions rely on ginger for acid reflux since it helps calm stomach acid and relax the muscles of the esophagus.