Taking GNC HERBAL PLUS Bilberry Extract 60 MG vegetarian herbal supplements provides a source of antioxidants to help support eye health. During intensive exercise routines, the body can produce excessive free radicals. Too many free radicals can damage healthy cells and encourage cell aging processes. Bilberries contain high levels of anthocyanins, the antioxidant pigments that give them their color. Antioxidants help the body fight cell damage caused by free radicals and support healthy immune system function. These bilberry extract supplements may also enhance blood circulation.