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(Sheng Dihuang / Raw Rehmanniae Radix) pairs well with Jiu (Alcohol/Wine) and Maidong (Ophiopogonis Radix). It is incompatible with Beimu (Fritillariae Bulbus) and fears Wuyi (Myrobalanus Chebulae Fructus).
Sweet, cold, slightly bitter, non-toxic. Enters the Taiyin Spleen meridian, Jueyin Liver meridian, and the Hand-Foot Shaoyin and Jueyin meridians. Cools blood and nourishes the liver, clears wind and moistens the wood (liver), eliminates stasis and unblocks menstruation, moistens dryness and resolves accumulation. Resolves excessive yang in warm diseases, reduces intense heat in smallpox/variolous eruptions. Removes cough caused by fire agitation, regulates blood heat in metrorrhagia. Treats hematuria, spitting of blood, vomiting of blood, and epistaxis; palpitations, flaccidity syndromes, and bi-syndromes [Note: Original text has a gap after "of"]. Fills the marrow and grows muscles, stabilizes fractures and reconnects severed tendons. Most damaging to the spleen and stomach, especially purges the large intestine.
Found everywhere, those from Huaqing have strong efficacy, while those from Jiangzhe have weak efficacy. Initially grows flat on the ground, leaves resemble wild cabbage but are hairy and rough, leaf surface is deep green, and lobed. Stems sprout from among the leaves, covered with fine hairs. Small tubular yellow-red flowers bloom at the stem tips, fruits resemble wheat grains.

(Ru Dihuang / Prepared Rehmanniae Radix) is best when washed with wine. Avoid radish (Lafu), scallion, garlic, and all blood products.
Sweet, neutral, non-toxic. Enters the Hand-Foot Shaoyin and Jueyin meridians. Nourishes kidney yin, fills marrow and generates essence, darkens beard and hair, sharpens hearing and brightens eyes.
Select thick Rehmannia roots, wash clean, discard thin and short ones, crush and squeeze out juice, pour into stone vessels to soak and filter, steam multiple times in a steamer until glossy black like lacquer. Recent methods involve mixing in powder of Amomi Fructus (Sharen), stirring well, placing in willow-wood steamers, and steaming/drying multiple times. Currently in the province, it is simply cooked ripe with wine.
For cough with bloody sputum, take Shengdihuang powder, cook with rice porridge and eat. (Verified Formula 1.)
For vomiting blood and cough, take one qian of Rudihuang powder each time, taken with wine. (2.)
For persistent epistaxis, take Shengdihuang together with Bohe (Menthae Haplocalycis Herba), powdered and ingested. (3.)
For intestinal wind bleeding, take Shengdihuang together with Wuweizi (Schisandrae Chinensis Fructus), formed into honey pills and ingested. (4.)
For ding-sores (carbuncles/furuncles) and breast abscesses, crush Shengdihuang and apply externally, replace when hot. (5.)
For all sores and ulcers, painful before rupture, pound Shengdihuang into mud, spread on the lesion, sprinkle Muxiang (Aucklandiae Radix) powder in the middle, cover with another layer of Shengdihuang mud, and apply. Internal resolution occurs after three to five applications. (6.)
For contusions and injuries, painful before rupture. Use same method as above. (7.)
For eye injury causing protrusion, wrap Shengdihuang mud in cotton and apply. (8.)
For sudden red and painful eyes, pound Shengdihuang and Heidou (Soybean/Glycines Max Seed) into paste and compress. (9.)
For toothache due to blood heat, cut fresh Shengdihuang and bite/chew on it. (10.)
For loose teeth about to fall out, wrap Shengdihuang in cotton, suck on it to let juice soak the root and swallow. (11.)
For constant tinnitus, plug ears with Shengdihuang, change frequently. (12.)
For bamboo or wood splinters in flesh, pound Shengdihuang rotten and apply. (13.)
For bone-steaming consumptive fever, use Shengdihuang as paste or honey pills. (14.)
For eye injury causing swelling and distending pain. External: Pound Shengdihuang into paste for application. Internal: Chuanxiong (Ligustici Chuanxiong Rhizoma), Shengdihuang, Lingyangjiao (Saigae Tataricae Cornu), Dahuang (Rhei Radix et Rhizoma), Chishao (Paeoniae Radix Rubra), Zhike (Aurantii Fructus Immaturus), Muxiang. (15.)
Shenqi Wan (Kidney Qi Pill): Gan Dihuang (Dried Rehmanniae Radix), Shanzhuyu Rou (Corni Fructus Flesh), Fuling (Poria), Zexie (Alismatis Rhizoma), Danpi (Moutan Cortex), Rougui (Cinnamomi Cortex), Fuzi (Aconiti Lateralis Radix Praeparata).
Treats deficiency-type lower back pain, urgency/tightness in the lower abdomen, and difficult urination. Also treats women's zhuanbao syndrome (retention of urine due to bladder displacement), inability to urinate, and shortness of breath. Also treats men's xiaoke syndrome (wasting-thirst) with polyuria.
Qiongyu Gao (Jade Essence Paste): Shengdihuang (16 parts), Ren Shen Mo (Ginseng Radix Powder, 1 part), Fuling Mo (Poria Powder, 3 parts).
Seal in a bottle, place in a pot and boil for three days, remove, immerse in the bottom of a well for one day, then boil again. Take each time with plain water or wine. Treats consumptive dry cough and blood disorders. (2.)
Liujun Dihuang Wan (Six-Ingredient Rehmannia Pill): Shudi (Prepared Rehmanniae Radix), Shanyao (Dioscoreae Rhizoma), Zhuyu Rou (Corni Fructus Flesh), Zexie, Fuling, Danpi.
Treats kidney yin insufficiency, fever with thirst, strangury/oliguria, qi stagnation with phlegm-cough, dizziness and vertigo, blurred vision, deafness, dry throat and sore throat, loose teeth, blood-deficiency fever, aphonia, etc. (3.)
Bawei Dihuang Wan (Eight-Ingredient Rehmannia Pill): The original Liujun formula plus Rougui and Fuzi.
Honey pills. Treats consumptive lower back pain, tightness in the lower abdomen, and difficult urination. Also treats women's irritability, heat, inability to lie down, and zhuanbao with anuria. (4.)