Dark chocolate helps in relieving pain associated with menstrual cycles. Few studies suggest dark chocolate serves a better purpose than milk chocolate in significantly reducing menstrual pain & cramps. Magnesium found in dark chocolate is known to ease uterine pain & contractions by relaxing the uterine muscles. Copper, another mineral found in chocolate, is also believed to play a role in relieving pain. A serving of 40-120 g of dark chocolate helps in reducing menstrual pain.