Inhaling too much carbon monoxide (CO) will cause troubled breathing. Instead of a German study actually found that if low-dose CO gas for pregnant women can prevent miscarriage. As proclaimed Dailymail, Otto-von Guerickeoleh university research, Germany, found that low doses of carbon monoxide can increase the growth of blood vessels in the placenta and establish blood flow in the umbilical cord.
The researchers used carbon monoxide on the pregnant mice with the condition known as intrauterine growth restriction, a serious complication of pregnancy. The result, carbon monoxide is able to restore the function of the placenta and prevent the death of the fetus without adverse effects.