Medical research has not concluded that vinegar is an effective treatment for heartburn; however, apple cider vinegar remains one of the most popular natural remedies for acid reflux. While unproven, the acidic nature of vinegar possibly aids digestion by helping break down fats, reports RefluxMD.
One theory as to why drinking apple cider vinegar can relieve heartburn is that the acid in the vinegar helps balance acid production in the stomach. Another theory is that the vinegar buffers the acidity level in the stomach because acetic acid, which is the main component of apple cider vinegar, is a weaker acid than the acid produced by the stomach, according to RefluxMD. An organic, raw, unpasteurized apple cider vinegar is recommended because it retains the natural enzymes that are lost during pasteurization.