Men who drink cooked dihuang for a long time can have certain benefits of tonifying blood and nourishing yin. Radix Rehmanniae Praeparata is sweet in taste and slightly warm in nature, with the effects of tonifying blood and nourishing yin, benefiting the essence and filling in the marrow. It can be used clinically for treating yellowish complexion (yellowish color with no luster) caused by blood deficiency, as well as lumbar and knee soreness and softness (a feeling of soreness and weakness of the waist and knees) caused by kidney and yin insufficiency, night sweating (abnormal sweating after going to sleep, and stopping of sweating after waking up), spermatorrhea, dizziness, and early whitening of the beard and hair. Men who drink Radix Rehmanniae Praeparata in their daily life can have certain benefits of tonifying blood and benefiting semen, and it is suitable for patients with kidney yin and blood deficiency. It is contraindicated for those with stagnant qi and phlegm, distension and pain in the epigastrium (abdomen), and loose stools (thin and unformed feces). Patients who need to use the drug should be guided by a doctor and should not use the drug on their own. It is not recommended to take Radix Rehmanniae Praeparata for a long period of time.