Rehmannia (Di Huang)
Botanical Name: Rehmannia glutinosa
Long considered a longevity herb in Chinese Medicine, rehmannia is recommended for treating anemia, palpations, irregular menses, osteoporosis and lowering blood pressure. It is also a beautiful ornamental garden flower that hummingbirds are attracted to.
Below is an overview of Rehmannia, combining and interpreting the best of Western Science, Traditional Chinese Medicine (TCM), Shamanism, Folklore and more. Gain a balanced and thorough understanding of the healing properties of Rehmannia.
Western Name: Rehmannia
Also Known As: Chinese Foxglove
Organs/Systems: Blood, Uterous, Bones, Heart
Key Western Actions & Medicinal Uses: Anti-inflammatory, Tonic, Analgesic, Depurative, Diuretic, Hypotensive.
Pin Yin: Di Huang
Also Known As: Shu Di Huang (which translates as “cooked yellow earth”), Xian Di Huang, Sheng Di Huang
Meridians: Heart, Kidney, Liver
Key TCM Actions & Medicinal Uses: Tonifies Blood: blood deficiency, pale, dizziness, palpations and insomnia. Irregular menses, uterine bleeding, Post-partum bleeding. Nourishes Yin: Kidney Yin deficiency, nocturnal emissions, nigth sweats, steaming bone disorder, wasting and thirsting disorders. Nourishes Blood/Tonifies Essence (Jing): low back pain, weakness in lower extremities, lightheadedness, premature greying hair due to blood loss.
Parts Most Frequently Used: Root (Dried, Fresh or Prepared)
Flavors/Temps: Sweet, Cold, Slightly Warm
Caution: None noted.
History/Folklore: The species name, “glutinosa” comes from glutinous, referring to the sticky nature of the root. It is closely related to another herb that carries the name of the plant family, Scrophularia ningpoensis. Both herbs are commonly used in China, though rehmannia which is stronger, is used far more frequently. Rehmannia is sweet and cold and Scrophularia is bitter and cold. They are similar in their ability to treat conditions that are cold in nature. They often appear together in formulas for this reason.
In China, its name translates as Big Yellow or Yellow Earth. It is often commonly called Chinese Foxglove due to its superficial resemblance to the genus Digitalis.
It is famous for treating broken bones and severed or damaged sinews, by expelling blood impediments, replenishing bone marrow, and promoting growth of muscles and flesh.
Its sweet sticky nature is said to help calm and settle Qi, helping to draw it downward so Qi can rise again in its more natural and regular pathways. The large quantities of sugar that are present in rehmannia can overwhelm the digestion giving a person a heavy feeling or slight nausea. Preparations and other herbs that it can be combined with help to counteract this possible effect.
Catalpol, one of the plants main constituents, makes up 3-11% of the undried root (depending on growing conditions) and only 1-2% in the dried root. It appears that cotalpol stimulates the production of adrenal cortical hormones. These hormones have anti-inflammatory properties that make it useful for treating asthma, skin diseases and arthritis. Catalpol is also involved in the production of sex hormones, explaining its use for treating menopause and impotence. New studies are indicating that catalpol may prevent cell death caused by neurodegenerative disorders.
Rehmannia is said to help re-balance Yin in the body. Traditionally it is prepared with yellow wine and black beans. Sheng Di Huang is dried rehmannia root that has been baked till nearly dry then kneaded into small balls. Xian Di Haung is fresh rehmannia newly harvested, and Shu Di Huang is prepared rehmannia, referring to the dried root having been steamed to a black color and then re-dried. Shu Di Huang is often steamed in wine until both the insides and outsides turn black and moist. When the herb is charred it is best for stopping bleeding.
Iridoid glycosides, Catalpol, Iridoids, Sucrose, Galactose, Fructose, Glucose, Mannitol, Verbasocose, Vitamins A, B, C, and D, Amino acids, Zinc.
Rehmannia’s large flowers attract hummingbirds and contribute to the plants popularity as an ornamental flower in European and North American gardens.
The classic Chinese formula, Rehmannia Six, is considered one of the most important and commonly used Yin and Essence (Jing) Tonics.
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