The best time for pregnant women to take Colla Corii Asini is in the middle of pregnancy, and the best effect is to take it half an hour to one hour after meal. Colla Corii Asini is non-toxic, warm in nature, and has the effect of tonifying blood, tranquilizing the fetus and nourishing Yin. After pregnancy, pregnant women need relatively more nutrients and are often in a state of anemia, especially after mid-pregnancy when the fetus grows faster and needs more nutrients, so most pregnant women start taking Colla Corii Asini to replenish blood after mid-pregnancy. If through the routine blood test, found that hemoglobin and other reduced, indicating anemia, then pregnant women can take at any time. But when consuming must control the dosage, generally recommended to maintain at about 15g a day, too much consumption of Colla Corii Asini easy to cause fire or diarrhea. Although the efficacy of Colla Corii Asini, but early pregnancy and late pregnancy are not recommended to take, because it has the effect of blood, can cause contractions, serious cases can cause miscarriage. Therefore, pregnant women must be careful when consuming Colla Corii Asini, it is best to take under the advice of a doctor.