Dietary Supplement High Potency This product contains Hydrochloric Acid and an enzyme called Pepsin, both on which are naturally produced in the stomach to aid in digestion. Pepsin, a protein digesting enzyme derived from porcine, is known to have an off odor when exposed to heat and moisture. This is not an indication of spoilage. Solaray guarantees that no ingredients other than those listed on this label have been added to this product.