Roots and rhizomesHeat-clearingRadix Rehmanniae

Sheng Di Huang (Raw Rehmannia Root)

A practical guide to Sheng Di Huang: what it is, how Traditional Chinese Medicine uses it, the classical formulas it appears in, and who should be careful with it.

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Last reviewed Oct 13, 2026

Quick Facts

Latin NameRadix Rehmanniae
Chinese Name & Pinyin 生地黃 · Sheng Di Huang
Medicinal PartRoots and rhizomes
The herbSheng Di Huang is the dried tuber of Rehmannia glutinosa. Fresh rehmannia and Shu Di Huang are different forms. Digitalis is not this drug.
Nature and channelsSweet, bitter, cold. Enters the Heart, Liver, and Kidney. Sweetness nourishes yin. Bitter cold clears heat and cools the blood.
Pharmacopoeia lineClears heat and cools the blood. Nourishes yin and generates fluids. Used for heat entering ying-blood, warm-toxin macules, vomiting or nosebleed, febrile damage to yin, crimson tongue and thirst, dry stool from damaged fluids, yin-deficiency fever, steaming bone, and interior-heat wasting-thirst.
Pattern cuesCrimson tongue and thirst. Macules and bleeding from heat. Steaming bone. Wasting-thirst. Dry stool.
In this articleSheng Di versus Shu Di, fresh rehmannia, Xuan Shen, and Mu Dan Pi. Cooling blood versus tonifying blood. Why loose stools are a caution. Who should skip it.

What Is Sheng Di Huang?

Sheng Di Huang (生地黄; Shēng Dì Huáng; Latin: Rehmanniae Radix; English: raw rehmannia root) is the dried tuber of Rehmannia glutinosa Libosch. In Chinese medicine it is a heat-clearing, blood-cooling herb. It is sweet, bitter, and cold, enters the Heart, Liver, and Kidney channels, and its core actions are to clear heat and cool the blood, and to nourish yin and generate fluids. It is not Shu Di Huang. Prepared rehmannia is steamed and dried, sweet and slightly warm. It more strongly tonifies blood, nourishes yin, and fills essence, and is more cloying. It is not Xian Di Huang. The fresh root clears heat, generates fluids, and cools blood more quickly, but it does not keep well. Sheng Di is the dried root used raw: it clears and also nourishes. English “foxglove” is easy to confuse with Digitalis. They are not the same plant. Do not swap them.

It is used most often for three patterns:

  • Heat entering the nutritive and blood levels — warm-toxin macules, vomiting or nosebleed, crimson tongue
  • Febrile disease damaging yin — vexing thirst, dry bound stool from damaged fluids
  • Yin-deficiency heat / interior-heat wasting-thirst — steaming bone, dry mouth

It is usually used raw. The usual decoction dose is 10–15 g. A cold weak spleen and damp loose stools are a caution. Sweet, bitter, cold, and moistening, it is not a “Kidney di huang” that can swap freely with Shu Di Huang.

When heat is in ying-blood, or yin fluids are already injured, macules, thirst, and steaming bone are common. Sheng Di is sweet-cold and nourishes yin. It clears, cools, and generates fluids, which is why it appears in Xi Jiao Di Huang Tang and Zeng Ye Tang. It is more cold-moistening than it is supporting. An abdomen that likes warmth, loose stools, and a greasy coating get worse if more cooling is added.

Sheng Di Huang is not a catch-all cooling or yin herb. In middle-cold diarrhea or phlegm-damp obstruction, using it alone can injure the stomach and generate dampness. Raw or prepared should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.

Sheng Di Huang Rehmannia Root

Sheng Di Huang: Materia Medica Profile

Identification & Quality Standard

Radix Rehmanniae

Botanical Origin

The dried unprocessed tuber of Rehmannia glutinosa Libosch. (Scrophulariaceae).

Production Regions

Primarily produced in the Chinese provinces of Henan (Huaiqing), Shanxi and Hebei.

Quality Requirements

Superior medicinal material is thick, heavy, blackish and oily on the fracture.

Macroscopic Features

Irregular masses or long strips, 6~12cm long; externally greyish-black or brownish-black, shrunken; fracture blackish and sticky; weak odor, slightly sweet.

Origin and Quality Identification

  • Origin: The most highly regarded, authentic roots come from Henan province (hence the premium name Huai Sheng Di). It is also grown in Hebei, Liaoning, and Shandong.
  • Appearance: A premium root is an irregular, chunky block that is swollen in the middle. The surface is dark brown or grayish with natural wrinkles. It feels soft yet tough.
  • Aroma and Taste: When broken, the inside is shiny, distinctly sticky, and dark brown or black. It has a mildly sweet and slightly bitter taste.
  • Raw vs. Prepared: It is easy to tell the raw and prepared versions apart. Sheng Di Huang is firmer with a lighter internal color, while Shu Di Huang is extremely soft, pitch-black inside, and tastes much sweeter.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Sweet, Bitter; ColdHeartLiverKidney

1. Historical Records

  • Shen Nong Ben Cao Jing: Listed it as a top-grade herb, praising its ability to heal injuries, resolve blood stasis, and "fill the marrow" (deeply nourish the body).
  • Ming Yi Bie Lu: Highlighted its crucial role in managing bleeding disorders and severe postpartum complications.
  • Ben Cao Gang Mu: Summarized its dual power beautifully: it cools the blood to stop bleeding (like nosebleeds or heavy periods) and nourishes Yin to treat dry mouth, hot flashes, and heat-induced constipation.
  • De Pei Ben Cao: Noted its excellent teamwork skills. For example, it moves upward when paired with wine, deeply tonifies the Kidneys when combined with Shu Di Huang, and builds blood when paired with Dang Gui (Angelica Root).

2. Evolution of TCM Understanding

Over the centuries, TCM masters utilized different facets of this versatile root:

  • Some focused on its fast-acting, cold nature to cool blood, using it for active bleeding or severe restlessness caused by heat.
  • Others emphasized its slow, heavy nature to nourish Yin, using it for chronic dry mouth, afternoon hot flashes, and dehydration.
  • Because it is cold and very sticky/heavy, doctors universally agree on one major caution: Sheng Di Huang should not be used alone by people with a weak, cold digestive system or those prone to diarrhea, as it can be too heavy for a weak stomach to process.

Sheng Di Huang Rehmannia Root

Core Efficacies & Traditional Applications

Traditional Functions

Clears heat, cools blood, nourishes yin, and generates fluids. Apply to heat in the ying and blood levels, thirst, steaming bone, and bleeding from blood heat.

1. Primary Focus: Clearing Heat and Cooling Blood

  • Traditional Function: Sheng Di Huang (Raw Rehmannia Root) is traditionally used to clear "Blood-Heat." This refers to internal heat that can cause restlessness or bleeding issues.
  • Target Symptoms: It is often applied when heat causes nosebleeds, bleeding gums, skin rashes, emotional restlessness, night fevers, or a deep red tongue.
  • Common Pairings: To enhance its cooling and bleeding-control effects, it is frequently combined with Xuan Shen (Figwort Root), Mu Dan Pi (Moutan Bark), Bai Mao Gen (Lalang Grass Rhizome), or Ce Bai Ye (Platycladus Leaf).
  • When to Avoid: Do not self-prescribe if you have a "Cold" Spleen and Stomach (e.g., you often have cold hands and feet or loose stools), or if you lack clear signs of internal heat.

2. Secondary Focus: Nourishing Yin and Generating Fluids

  • Traditional Function: It helps replenish depleted "Yin" (cooling fluids) and moistens dry internal organs.
  • Target Symptoms: Used for Yin-deficiency signs like a parched mouth, dry throat, dry eyes, hot flashes in the palms and soles, night sweats, or dry constipation.
  • Common Pairings: Often paired with Mai Dong (Ophiopogon Tuber) and Yu Zhu (Solomon's Seal Rhizome) to enhance fluid generation, or used with Xuan Shen and Mai Dong to relieve heat-induced constipation.
  • When to Avoid: Avoid if you have loose stools, weak digestion, or heavy "Damp-Cold" in the body, as its heavy nature can further slow down digestion.

3. Common Herb Pairings: Synergistic Duos

  • Sheng Di Huang and Xuan Shen: While Sheng Di Huang focuses on nourishing Yin and cooling blood, Xuan Shen excels at clearing heat and soothing the throat. Together, they powerfully clear internal heat and relieve dry, sore throats. (Requires professional diagnosis).
  • Sheng Di Huang and Dang Gui (Angelica Root): Sheng Di Huang cools the blood and nourishes Yin, while Dang Gui builds and moves the blood. This duo is excellent for addressing pale complexions and irregular menstruation caused by Blood and Yin deficiency.

Sheng Di Huang Rehmannia Root

Modern Research

Modern research offers useful context, but Traditional Chinese Medicine prescribes on whole-pattern diagnosis rather than isolated compounds.

1. Main Chemical Components

Modern science reveals that Sheng Di Huang contains active compounds like iridoid glycosides (such as catalpol), as well as sugars, amino acids, and trace elements. In laboratory test tubes, these compounds demonstrate antioxidant properties. In animal studies, extracts have shown potential in regulating blood sugar levels. However, we currently lack large-scale human clinical trials to confirm these exact effects in daily medical practice.

2. Modern Pharmacological Focus

Current scientific research is mainly exploring a few key areas:

  • Anti-inflammatory Effects: Observing how the herb might reduce internal inflammation.
  • Immune Support: Investigating its potential to gently balance and regulate the immune system.
  • Systemic Regulation: Exploring its mild effects on the nervous and endocrine systems. While promising, these are mostly preliminary laboratory findings.

3. Limitations of Modern Research

While modern science provides interesting clues, it has notable limits:

  • Lab vs. Life: Results from isolated cells and lab rats do not perfectly translate to complex human bodies.
  • Format Differences: Clinical studies often use highly concentrated, purified chemical extracts, which behave very differently from drinking a traditional, water-boiled herbal decoction.
  • The Holistic Effect: TCM relies on the natural synergy of the whole plant. Pinpointing a single chemical like catalpol does not fully explain the comprehensive, balancing effect of the whole root as it has been used for thousands of years.

Sheng Di Huang Rehmannia Root

Comparing Similar Herbs

1. Shared Traits with Similar Herbs

Sheng Di Huang and Xuan Shen share several key characteristics:

  • Both primarily nourish Yin and clear internal heat.
  • Both target traditional Yin-deficiency symptoms like dry mouth and hot flashes.
  • They often appear together in dietary therapies or formulas for autumn dryness.
  • Both require caution for people with weak, cold digestive systems, as large doses can upset the stomach.

2. Core Differences

  • Nature and Flavor: Both are cold in nature. However, Sheng Di Huang is sweet and bitter (focusing on clearing heat), while Xuan Shen is sweet, bitter, and salty (focusing on softening hard nodules).
  • Core Strength: Sheng Di Huang excels at nourishing fluids and cooling the blood (great for bleeding or severe restlessness). Xuan Shen excels at clearing toxicity and soothing the throat (great for sore throats and swollen lymph nodes).
  • Action on the Body: Sheng Di Huang is a "clear and nourish" herb that doesn't drastically move the body's energy. Xuan Shen helps disperse stagnation and clear blockages.
  • Target Symptoms: Choose Sheng Di Huang for dry mouth, dry stool, and heat-related bleeding. Choose Xuan Shen for sore, red eyes, throat swelling, and swollen glands.
  • Contraindications: Both are bad for weak digestion. However, because Xuan Shen disperses energy, it can be slightly harder on individuals with heavy "Phlegm-Dampness."

3. A One-Sentence Summary

Sheng Di Huang is your go-to for deeply nourishing fluids and cooling overheated blood, while Xuan Shen is better for clearing heat toxicity and relieving a swollen, sore throat.

Sheng Di Huang Rehmannia Root

Classical Formulas Containing Sheng Di Huang

+8 more

Formulas vs. Single Herbs

  • Synergy is Key: A formula is a balanced team. The healing power comes from how the herbs interact, so a single herb cannot simply replicate a full formula's effects.
  • Holistic Balance: The exact dosage and combination in a formula affect the entire body. Never try to mix or alter these formulas at home based on internet articles.

Diet & Daily Home Use

1. Home Herbal Teas and Drinks

  • Sheng Di Huang and Mai Dong Tea:
    • Ingredients: 3g Sheng Di Huang, 2g Mai Dong (Ophiopogon Tuber), 1g Gou Qi (Goji Berry).
    • Method: Place in a cup, cover with boiling water, and steep for 10 minutes. Can be re-steeped until the flavor fades.
    • Best For: Autumn dryness, daily dry mouth, mild hot flashes, or dry eyes from heavy screen time.
    • Not For: People with cold hands/feet, weak stomachs, or frequent diarrhea.
    • Frequency: 2 to 3 times a week. Do not drink continuously long-term.
    • Note: This is a medicinal herb, not a standard vegetable. Stick to the suggested amounts and brewing methods.

2. Brewing and Processing Differences

Raw Sheng Di Huang is very cold and focuses on clearing heat. When it is processed (steamed with wine) into Shu Di Huang (Prepared Rehmannia Root), its coldness disappears, and it becomes a warm, heavy tonic for the Kidneys. For home brewing, simply soak the raw herb in cold water for 30 minutes, boil on high, then simmer for 20–30 minutes. Do not swap raw herbs for processed granules or liquid extracts without checking conversions.

3. Dosage and Usage Cycle

  • Dosage: Traditional clinical doses range from 10–15g. For home teas or soups, the dose is much smaller (around 3g).
  • Cycle: Use for 1 to 2 weeks for dry symptoms. Do not exceed 1 month. If symptoms persist, see a doctor.
  • Special Groups: Pregnant women, children, and seniors must consult a professional for exact dosing.
Sheng Di Huang Rehmannia Root

Contraindications & Safety Warnings

1. Who Should Avoid It

  • Cold Constitutions: If you suffer from stomach pain after eating cold foods, loose stools, or chronic cold limbs, avoid this herb.
  • Pregnancy & Nursing: Use only under strict professional supervision.
  • Children & Seniors: Due to weaker digestive systems, doses must be carefully managed by a practitioner.
  • Liver/Kidney Issues: Consult a doctor to avoid adding strain to these organs.
  • Allergies: Use with caution if you are allergic to plants in the Scrophulariaceae family.
  • Medical Treatments: If you are on immunosuppressants or chemotherapy, consult your doctor first to avoid interactions.

2. Medication Interactions and Dietary Notes

Sheng Di Huang may interact with blood thinners (increasing bleeding risk), blood pressure medications (enhancing the lowering effect), and diabetes drugs (affecting blood sugar levels). Always consult your doctor or pharmacist if you are on prescription medications. While there are no strict "clashing foods," avoid pairing it randomly with other potent herbs or extremely spicy/greasy meals that stress digestion.

3. Adverse Reactions and Overdose Risks

  • Side Effects: Because it is heavy and cold, taking too much can cause bloating, loss of appetite, or diarrhea.
  • When to Seek Help: If you experience severe allergic reactions, continuous vomiting, breathing difficulties, or rapid worsening of symptoms, stop use immediately and seek emergency medical care.

Frequently Asked Questions About Sheng Di Huang

What is Sheng Di Huang? Are Xian Di Huang, Gan Di Huang, Shu Di Huang and Huai Di Huang the same?
Official Di Huang is the fresh or dried tuber of Rehmannia glutinosa. The pharmacopoeial name is Rehmanniae Radix. The fresh tuber is Xian Di Huang; slowly baked to about eight-tenths dry is Sheng Di Huang (Gan Di Huang). Huaiqing, Henan lots are habitually called Huai Di Huang. Shu Di Huang is a separate article: steamed or wine-stewed until black and moist, sweet and slightly warm, supplements Blood, enriches Yin and fills essence and marrow—the cold heat-clearing action is gone. Write Sheng Di Huang; do not dispense Shu Di. Acute cooling of Blood and stopping bleed may name Xian Di Huang.
What are the TCM properties and traditional uses of Sheng Di Huang?
According to the Chinese Pharmacopoeia, Sheng Di Huang is sweet and cold, enters the Heart, Liver and Kidney channels, and acts to clear heat and cool the Blood, nourish Yin and generate fluid. It is used for heat entering construction-blood, warm-toxin macular eruption, vomiting and nosebleed, heat disease injuring Yin, crimson tongue and vexing thirst, fluid damage with constipation, Yin-vacuity fever, steaming bone taxation heat, and interior-heat wasting-thirst. Fresh Rehmannia is sweet-bitter-cold: more urgent to clear heat, generate fluid, cool Blood and stop bleed. Sweet-cold and moistening, it suits heat exuberance injuring Yin, not Spleen vacuity with damp stagnation, loose stool and bloating.
How do you choose fresh, raw and prepared Rehmannia?
Warm disease at construction-blood, vomiting of blood, nosebleed and sore throat more often use Xian Di Huang (12–30 g). Yin-vacuity interior heat, fluid-damage constipation, steaming bone and wasting-thirst more often use Sheng Di Huang. Blood-vacuity sallow complexion, Liver-Kidney essence depletion and premature greying use Shu Di Huang—not this article. Cut thick slices; being moist it may be added later or cooked longer. Do not mix raw and prepared.
What is the usual dosage? Can it be drunk daily as a Yin-nourishing tea?
The pharmacopoeial decoction dose is 10–15 g for Sheng Di Huang and 12–30 g for fresh Rehmannia. It is not a four-season “Sheng Di Yin tea.” Spleen-vacuity loose stool only grows colder and looser. Yin-vacuity interior heat needs a practitioner to name fresh or raw and a course; do not replace cooling the Blood with Shu Di.
What are the contraindications? Can it be used in pregnancy?
Unsuited to Spleen vacuity with damp stagnation, loose stool and bloating, and Yang vacuity with aversion to cold. Sweet-cold and cloaking, it encumbers the Stomach. Blood-heat injuring Yin in pregnancy needs assessment; weak Spleen-Stomach and fetal stirring with loose stool should not take large cold-moist doses. Reduce or stop if epigastric fullness and loose stool appear.
Can Sheng Di Huang cool the Blood, nourish Yin and moisten the stool?
It can help heat entering construction-blood and Yin-vacuity fluid damage. Construction-blood-aspect heat joins water buffalo horn, red peony and Moutan in the Xi Jiao Di Huang Tang pattern. Fluid-damage constipation joins Scrophularia and Ophiopogon in Zeng Ye Tang. It clears heat and nourishes Yin without supplementing Blood and filling essence—not a specific for every bleed, every constipation or every wasting-thirst. Massive hemoptysis and high fever with clouded spirit are emergencies.
Can Sheng Di Huang be drunk daily as a fire-down, anti-aging or blood-sugar tea?
Yin-vacuity interior heat may enter a short formula; Spleen-vacuity damp stagnation only grows more diarrheal. “Sheng Di downs fire and anti-ages” does not replace hematology and endocrinology. Clearing heat and nourishing Yin should name Sheng Di Huang (not Shu Di) and a 10–15 g dose.
How do you choose among Sheng Di Huang, Shu Di Huang, Xuan Shen, Mu Dan Pi and Mai Dong?
Raw Rehmannia is sweet-cold: clears heat, cools the Blood, nourishes Yin and generates fluid. Prepared Rehmannia is sweet and slightly warm: supplements Blood, enriches Yin and fills essence and marrow—it does not cool the Blood. Scrophularia is sweet-bitter-salty and slightly cold: clears heat, cools the Blood, enriches Yin, downs fire, resolves toxin and dissipates binds—saltier and colder. Moutan is bitter-acrid and slightly cold: clears heat, cools the Blood and quickens the Blood to dissipate stasis—moving, not staying. Ophiopogon is sweet, slightly bitter and slightly cold: nourishes Yin, moistens the Lung, benefits the Stomach, generates fluid and clears the Heart—upper jiao. Construction-blood heat favors Sheng Di, Mu Dan Pi and Xuan Shen; essence-Blood depletion favors Shu Di; Lung-Stomach Yin damage favors Mai Dong. They may be paired; all are wrong as pure cold-moistening in Spleen-vacuity loose stool, and raw and prepared must not be swapped.
Which herbs is Sheng Di Huang combined with? What are the representative formulas?
Heat entering construction-blood joins water buffalo horn, red peony and Moutan in Xi Jiao Di Huang Tang (buffalo horn commonly substitutes rhinoceros). Fluid-damage constipation joins Scrophularia and Ophiopogon in Zeng Ye Tang. Write Sheng Di Huang or Xian Di Huang; do not dispense Shu Di.
How do you choose and store Sheng Di Huang?
Choose large stout pieces, a glossy black or brown-yellow fracture, moist texture and a slightly sweet taste; Huai Di Huang is preferred. Bury fresh stock in sand against frost. Withered, hollow, moldy, moth-eaten and sour lots are discarded. Store dried Sheng Di Huang airy and dry against mold and moths. Buy “Sheng Di Huang”; do not replace clearing heat and cooling the Blood with an equal weight of Shu Di or anonymous “Di Huang slices.”

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Medical Disclaimer — This article is provided for educational purposes only and describes traditional Chinese medicine concepts. It is not medical advice, and it is not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified practitioner before using any herb, particularly if you are pregnant, nursing, taking medication or managing a diagnosed condition.

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Sheng Di Huang (Rehmannia Root): Clear Heat, Cool the Blood, and Nourish Yin