This product is the root of the perennial herb Rehmannia (Rehmannia glutinosa Libosch) from the Scrophularia Root family. It is mainly produced in Henan, Hebei, Inner Mongolia, and Northeast China. It is cultivated in most regions. It is harvested in autumn and used fresh or dried and sliced for use.

bubble_chart Properties and Meridians

Sweet and bitter, cold. act on heart, liver and lung channels.

bubble_chart Efficacy

Clearing heat and cooling blood, enriching yin and producing fluid.

bubble_chart Indications

1. Used for heat entering the nutrient-blood, dry mouth, and crimson tongue. This product is sweet and cold in nature, moistening, clearing heat with bitter cold, entering the nutrient and blood aspects, and is an essential medicine for clearing heat, cooling blood, enriching yin, and producing fluid. It treats dampness-heat diseases with heat entering the nutrient-blood, high fever, unconsciousness, dry mouth, and crimson tongue, often used in combination with Scrophularia Root and others, such as Nutrient-Clearing Decoction. For the late stage of warm disease [third stage], where residual heat remains and yin fluids are damaged, with night fever abating at dawn, red tongue, and rapid pulse, it is often used with turtle carapace, Sweet Wormwood, Anemarrhena, and others, such as Sweet Wormwood and Turtle Shell Decoction.
2. Used for reckless blood heat, macula and papule, vomiting, and nosebleeds. This product clears heat and purges fire, cools blood, and stops bleeding. It treats blood heat vomiting, nosebleeds, bloody stool, menorrhagia, and metrostaxis, often used with fresh Lotus Leaf, raw Mugwort, and raw Platycladus, such as Four Fresh Ingredients Pill; for warm febrile disease with heat entering the nutrient-blood, excessive blood heat toxin, hematemesis, nosebleeds, macula and papule, purple and black, it is often used with Red Peony Root and 丹皮.
3. Used for fluid damage and thirst, internal heat consumptive thirst. This product is sweet and cold, clearing heat and nourishing yin, promoting fluid production to quench thirst. It treats internal heat consumptive thirst, often used with Chinese Yam, raw Astragalus Root, and pig pancreas, such as Zicui Drink; for warm disease damage to yin, intestinal dryness, and constipation, it can be used with Scrophularia Root and Ophiopogon Tuber, such as Fluid-Increasing Decoction.

bubble_chart Documentation

1. Benjing: "It treats broken tendons and bones, injuries to the middle. It expels blood stasis, replenishes marrow, and promotes muscle growth."
2. Bielu: "It treats men's five strains and seven injuries, and women's injuries to the middle, vaginal bleeding during pregnancy, and bleeding below."
3. Zhenzhunang: "It cools blood, generates blood, and nourishes the true yin of kidney water."

bubble_chart Usage and Dosage

Decoct and take 10-30g, double the amount for fresh product, or use fresh product mashed into juice for medicinal purposes. Fresh Unprocessed Rehmannia Root has a sweet and bitter taste and is of Great Cold nature (24th solar term). Its effects are similar to dried Rehmannia, with slightly less potency in enriching yin, but stronger in clearing heat and promoting fluid production, as well as cooling blood and stopping bleeding.

bubble_chart Cautions and Contraindications

This product is cold and stagnant in nature, and is not suitable for those with spleen deficiency, damp stagnation, abdominal distension, fullness, or loose stools.

bubble_chart Modern Pharmacology

This product contains β-sitosterol, Rehmannia factor, mannitol, glucose, alkaloids, iron, vitamin A, and other components. Unprocessed Rehmannia Root has certain effects such as strengthening the heart, promoting diuresis, increasing blood pressure, and lowering blood sugar. Extracts of Unprocessed Rehmannia Root can promote blood coagulation. Oral administration of Unprocessed Rehmannia Root charcoal to mice can shorten bleeding time. Rehmannia decoction also has the effect of protecting the liver and preventing the reduction of liver glycogen. It also has a certain anti-radiation injury effect and can inhibit the growth of various fungi.