This is the prepared rehmannia root used in TCM. It is sweet, moistening, and warm in nature helping to replenish heart and liver blood and also can nourish both liver and kidney-yin, serving as a main herb for warming and enriching essence and blood. It is often used to treat syndromes of blood-deficiency, deficiency of both liver-yin and kidney-yin as well as severe insufficiency of kidney essence. These conditions can manifest as dizziness, menstrual irregularities, insomnia, tinnitus, or night sweats. Rehmannia is very sticky and moist and is usually used in formulation to not create too much dampness.