The effects of Radix Rehmanniae Praeparata with Cinnamon are nourishing yin and filling the marrow, tonifying fire and helping yang (replenishing the body’s yang energy), etc. It should be used under the supervision of a doctor. Radix Rehmanniae Praeparata with Cinnamon has the effects of nourishing yin and replenishing blood (nourishing the blood in the body), filling the medulla oblongata and benefiting the vital essence. It can be used to treat blood deficiency and atrophy of the yellowish color, dizziness, ringing in the ears, palpitations (accelerated heartbeat often accompanied by panic attacks), menstrual disorders, disintegration and leakage of menstruation (menstruation that is too profuse or drips more than once) and bleeding, soreness in the lower back and knees (the sensation of being sore and weak in the lower back and knees), spermatorrhea and night sweating (sweating abnormally after falling asleep, but stopping after awakening), and premature graying of the hair. The adverse effects of Radix Rehmanniae Praeparata are not clear, and it is contraindicated for people with stagnant qi and phlegm, bloating and pain in the epigastrium (abdomen), and loose stools (scanty and unformed feces). Cinnamon has the effects of tonifying fire to help yang, inducing fire to return to the source (inhibiting the rise of fire in the kidneys), warming the meridians, dispersing cold and relieving pain (relieving pain by removing the cold in the body). It is used in the treatment of cold pain in the lower back and knees, vertigo and redness of the eyes, deficiency of yang (the relative lack of yang affecting the head and face), impotence and coldness in the uterus, deficiency of the kidneys and shortness of breath, cold hernia and abdominal pain (acute abdominal pain caused by deficiency of coldness in the internal organs and the feeling of coldness from the wind outside), menstrual dysmenorrhoea and menstrual closure, and other conditions. Adverse effects of cinnamon is not clear, yin deficiency and fire (Yin essence deficiency in the body, the appearance of hyperactive fire) should not be served, bleeding tendency and pregnant women should be used with caution, should not be used with red stone resin. The combination of Radix Rehmanniae Praeparata and Cinnamomum Cassia has the effect of nourishing yin and filling in the marrow, tonifying the fire and helping the yang, and should be used under the guidance of a doctor to identify the symptoms, and should not be used on its own.