Raw and cooked dihuang includes raw dihuang and cooked dihuang, the price varies due to different origin, color, region and distributor, the price of raw dihuang is roughly $0.15~0.32/g and the price of cooked dihuang is roughly $0.12~0.32/g. Raw Dihuang is a heat-clearing and blood-cooling (relieving blood heat by clearing heat) traditional Chinese medicine, which is the fresh or dried tuberous root of Dihuang, a plant of the family Xuanxianaceae. It is sweet in taste, cold in nature, and belongs to the heart, liver and kidney meridians. It has the efficacy of clearing heat and cooling blood, nourishing yin and generating fluids, and is used in treating heat entering into the camp and blood (the degree of invasion of heat into the human body is deep, and the symptoms are more serious), vomiting hematemesis, epistaxis, heat diseases that injure the yin, tongue with reddish-red tongue and irritable thirst, constipation with injury of fluids, heat with deficiency of the yin and fever, and laborious heat with bone vapor. Radix Rehmanniae Praeparata is a blood tonic Chinese medicine, which is a processed product of Radix Rehmanniae Praeparata. It is sweet in taste, slightly warm in nature, and belongs to the liver and kidney meridians. It has the effects of tonifying blood, nourishing yin, benefiting essence and filling in the marrow, and is used in treating blood deficiency and atrophy, irregular menstruation, yin deficiency of liver and kidney (deficiency of yin in liver and kidneys), night sweating (abnormal sweating after falling asleep, but sweating stops when waking up), spermatorrhea, vertigo, tinnitus, and premature graying of the beard and hair. Adverse effects of Radix Rehmanniae Praeparata are not known. It is contraindicated in people with spleen deficiency, dampness stagnation, and abdominal fullness and loose stools (thin, unformed feces). Adverse effects of Radix Rehmanniae Praeparata are not known, but should not be used if there is stagnation of qi and phlegm, dampness and fullness in the middle of the body (too much dampness leading to fullness and discomfort in the spleen and stomach), or if there is little food and loose stools. If there is a need for medication, it is recommended to use it under the guidance of a professional physician, and not blindly self-medication.