More than 2 million Americans who use a certain class of drugs for gastroesophageal reflux and other stomach disorders face the risk of a side effect that could permanently leave them unable to control bodily movements, according to Reuters in late February.

The cause of the condition is linked to metoclopramide, an ingredient in the medicines. Symptoms, likely irreversible, include repetitive, uncontrollable movements of the limbs, lips and tongue, Reuters reports.

Digestive enzyme supplements are a good choice for those seeking to enhance and help combat symptoms of improper digestion. Enzymes aid in the body's natural digestive process, helping the body get more nutrition from food.

Certain herbal and nutritional ingredients, some included in enzyme supplements, also help soothe and protect the gastrointestinal lining. These include marshmallow root, aloe vera gel and licorice root.