In the stomach, hydrochloric acid converts pepsinogen to pepsin, an enzyme that breaks down protein. Pepsin breaks down proteins into smaller, more easily absorbed substances. As people age, hydrochloric acid secretion may be reduced, which can result in decreased levels of pepsin. Contains no yeast, dairy, egg, gluten, corn, soy, or wheat. Contains no sugar, starch, preservatives, or artificial color, flavor, or fragrance.