Radix Rehmanniae Praeparata (熟地黄) is used to tonify blood, nourish yin, benefit the essence and fill in the marrow. It is used for treating blood deficiency and atrophy, irregular menstruation, dislocation of menstruation, discharging of blood in excessive or dripping menstruation, and insufficiency of kidney yin. Radix Rehmanniae Praeparata is the tuberous root of Radix Rehmanniae Praeparata, family Xuanzanaceae, processed and steamed, with the effects of tonifying qi and blood, nourishing yin and tonifying the kidneys, benefiting the essence and filling the marrow. Radix Rehmanniae Praeparata is used for treating disintegration of blood, deficiency of kidney yin, lumbar and knee weakness (a feeling of soreness and weakness of the waist and knees), blood deficiency and yellowing, irregular menstruation, night sweating (abnormal sweating after falling asleep, sweating stops after waking up), spermatorrhea, deficiency of essence and blood, dizziness and dizziness, and premature whitening of the beard and hair. Adverse effects of Radix Rehmanniae Praeparata include the possible appearance of light red pimples on the skin, and those with solid heat syndrome should not take this product in large quantities for a long period of time. Chinese medicine needs to be used under the guidance of Chinese medicine practitioners to identify the symptoms, and individuals should not use it blindly to avoid adverse consequences.