What is Bilberry Extract Powder? Bilberry is famous as a tasty snack and ingredient in many desserts, but it is also an effective nutritional and medicinal supplement. Recent reports indicate that a compound, used by Blueberries and Grapes to fight off fungal infections, could also help lower cholesterol. The compound, called pterostilbene, also helps regulate blood sugar and might help fight type2 diabetes. This finding adds to a growing list of reasons to eat, or supplement with, the colorful fruit, especially Blueberries, which are rich in compounds known as antioxidants(these molecules battle cell and DNA damage involved in cancer, heart disease, diabetes and perhaps also brain degeneration).