There is no authoritative information to prove that Radix Rehmanniae is effective in lowering urinary protein. Radix Rehmanniae Praeparata is mainly used for treating blood deficiency and atrophy, palpitations (rapid heartbeat, often accompanied by panic), dyskinesia (violent heartbeat, panic), and irregular menstruation. Radix Rehmanniae Praeparata (熟地黄), sweet in flavor and slightly warm in nature. It belongs to the liver and kidney meridians. It has the effect of tonifying blood and nourishing yin, benefiting essence and filling in marrow. It is used in treating blood leakage (excessive menstrual flow or more than a few drops), Yin deficiency of the liver and kidney, lumbar and knee soreness and weakness (a feeling of soreness and weakness in the waist and knees), bone vapor and hot flashes, night sweating and spermatorrhea, internal heat and thirst (internal heat accompanied by excessive eating, drinking and urinating), and premature whitening of the beard and hair. It should be noted that it is contraindicated for people with weak spleen and stomach, stagnant qi and phlegm, and fullness of the abdomen and loose stools (thin and unformed feces). Rehmannia glutinosa is a commonly used drug in clinical practice and should not be used indiscriminately, but must be used under the guidance of a Chinese medicine practitioner.