Yerba Prima Bilberry Extra Strength contains clinically tested bilberry extract (Vaccinium myrtillus - Wild European Bilberry) plus the assimilation boosting nutrient Bioperine black pepper extract. Over 30 years of research have proven the remarkable ability of bilberry to support the health of the eyes, capillaries, arteries and veins. The same blood vessel strengthening and antioxidant properties of bilberry extract help in other parts of the body as well. It has been shown to support normal vein function and help maintain proper blood flow in the legs. If you use a computer a lot, you may be interested to know that people are reporting to us that Bilberry Extra Strength helps to relieve the eye fatigue they experience from hours looking at the computer screen. Maximum Absorption Bilberry Extra Strength provides maximum absorption. Our Extra Strength formulas are made with standardized herbal extracts, which are assimilated more completely than common powdered herbs. Bioavailability of our Extra Strength herbs is further boosted by the addition of a patented black pepper extract, Bioperine. As part of our Extra Strength formulas, it actually increases the amount of herb crossing the intestinal lining into the bloodstream. What this means to you is greater absorption, which equals greater benefits.