Guaranteed Potency Extract Natrol® s Bilberry Extract is specially produced to yield high levels of anthocyanosides. This extraction process assures that the actives are present which helps support night vision, eye and circulatory health.* Guaranteeing the potency is Natrol s way of assuring our consumers the health benefits they are looking for. No yeast, wheat, corn, milk, egg, soy, glutens, artificial colors or flavors, added sugar, starch or preservatives. ; *The FDA has not evaluated this statement. This product is not intended to diagnose, treat, cure or prevent disease. natrol.com.