It can help some people—especially bicarbonate-rich mineral water, which may buffer stomach acid and reduce post-meal discomfort. However, it is not universal. In individuals with reflux, gastritis, or ulcers, carbonation can worsen symptoms such as heartburn or belching. Therefore, “it soothes the stomach” depends on personal tolerance. If your goal is stomach comfort, consider small portions after meals, drink slowly, and track symptoms.