Four Substances Soup and other medicines are generally not recommended to be taken during breastfeeding so as not to affect breast milk, but can be taken under the guidance of a medical professional if symptoms of deficiency of Ying and Blood occur. Four Substance Soup is one of the representative formulas for tonifying blood, consisting of four medicines: Radix Rehmanniae Praeparata, Radix Angelicae Sinensis, Radix Paeoniae Alba and Rhizoma Ligustici Chuanxiong. Four Substance Soup has a very good effect of tonifying blood, and can be taken as prescribed by a doctor for symptoms such as palpitations (rapid heartbeat, often accompanied by panic), insomnia, dizziness, lack of color, thinness and weakness, and vague pain in the abdomen. Under normal circumstances, in order to ensure the health of the mother and fetus during breastfeeding, it is not recommended to take drugs, so as to avoid the metabolism of drugs through breast milk to infants and children, affecting the health of infants and children. If during breastfeeding there is a deficiency of blood, in line with the clinical indications of the Four Substances Soup, this time under the guidance of a professional doctor, you can take the Four Substances Soup to regulate. Four Substance Soup should be used correctly under the guidance of a professional physician, the adverse effects are not clear, and should be used with caution in cases of loose stools.