From the Manufacturer’s Label:
Support for Healthy Aging
pTeroPure® Pterostilbene is 99% pure pterostilbene, a compound that occurs naturally in small amounts in fruits such as blueberries, huckleberries and grapes. Pterostilbene is similar in structure to the healthy compound resveratrol.
Manufactured by Source NaturalsContains No: Yeast, dairy, egg, gluten, soy, wheat, sugar, starch, salt, preservatives or artificial color, flavor or fragrance.