Bilberries are also linked to eye health, in particular the possibility of slowing or reversing the effects of macular degeneration. Helpful for supporting healthy blood sugar levels, bilberry is also used for its beneficial effects in improving blood circulation, maintaining healthy cholesterol levels, and relief for nausea and indigestion. Bilberries are also known to be helpful for joint health, kidney and urinary tract health, menstrual cramps and diarrhea.