Herb

Shu Di Huang

Prepared rehmannia | 熟地黄

Also known as:

Shu Di (熟地)

Shu Di Huang

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Properties

Blood-tonifying herbs (补血药) · Slightly Warm

Traditionally supports*

Blood health Kidney Health Fertility Healthy Aging Menstrual Health

Parts Used

Tuber (块茎 kuài jīng / 块根 kuài gēn)

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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About This Herb

Traditional Chinese Medicine background and properties

Herb Description

Prepared Rehmannia root is one of the most important blood-nourishing herbs in Chinese medicine. Created by repeatedly steaming and drying the raw Rehmannia root, it becomes a rich, sweet tonic that replenishes blood and deeply nourishes the body's vital reserves. It is commonly used for symptoms related to blood deficiency and kidney weakness, such as fatigue, dizziness, menstrual irregularity, lower back soreness, and premature greying of hair.

Herb Category

Blood-tonifying herbs (补血药)

Main Actions

  • Nourishes Blood
  • Nourishes Yin
  • Benefits Essence and Fills the Marrow
  • Supplements the Liver and Kidneys

How These Actions Work

'Tonifies Blood' means Shu Di Huang replenishes the body's blood supply. In TCM, blood is responsible for nourishing and moistening the tissues, maintaining healthy complexion, and supporting clear thinking. When blood is deficient, a person may look pale or sallow, feel dizzy, experience palpitations, or have scanty or irregular periods. Shu Di Huang is considered the primary herb for addressing blood deficiency and is the lead ingredient in Si Wu Tang (Four Substances Decoction), the foundational blood-tonifying formula.

'Nourishes Yin' refers to replenishing the body's cooling, moistening, and substantive reserves. Yin deficiency shows up as dryness, night sweats, hot flashes, a dry mouth and throat, and a feeling of heat in the palms and soles. Because Shu Di Huang enters the Liver and Kidney channels and has a rich, sweet, and slightly warm nature, it deeply nourishes the Yin of these organs without the cold nature that raw Rehmannia (Sheng Di Huang) carries.

'Benefits Essence (Jing) and fills the marrow' means this herb supports the body's deepest constitutional reserves. In TCM, Essence is stored in the Kidneys and governs growth, reproduction, brain function, and bone strength. When Essence is depleted, symptoms such as premature greying, weak knees and lower back, poor memory, reduced fertility, and slow development in children may appear. Shu Di Huang's heavy, dense, sticky quality allows it to sink deeply to replenish these fundamental reserves.

'Supplements the Liver and Kidneys' reflects the herb's channel affinity. The Liver stores blood and the Kidneys store Essence. When both organs are depleted, symptoms may include blurred vision, tinnitus, dizziness, lower back weakness, and menstrual disorders. Shu Di Huang addresses the root cause by nourishing both Liver blood and Kidney Yin simultaneously.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Shu Di Huang is traditionally associated with these specific patterns.

The following describes this herb's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.

Why Shu Di Huang addresses this pattern

Shu Di Huang is the foremost herb for blood deficiency. Its sweet taste and slightly warm nature directly tonify and generate blood, entering the Liver channel where blood is stored. Its rich, dense quality provides the substantial material the body needs to replenish depleted blood. Unlike herbs that simply move or invigorate blood, Shu Di Huang acts as a building block, supplying deep nourishment that addresses the root of blood deficiency.

A practitioner would look for one or more of these signs

Dull Pale Complexion

Sallow or pallid face from insufficient blood nourishing the skin

Dizziness

Dizziness from blood failing to nourish the head

Severe Heart Palpitations

Palpitations from the Heart lacking blood nourishment

Irregular Menstruation

Scanty or irregular periods from insufficient blood to fill the Chong vessel

Insomnia

Poor sleep due to blood failing to anchor the spirit

TCM Properties

Temperature

Slightly Warm

Taste

Sweet (甘 gān)

Channels Entered
Liver Kidneys
Parts Used

Tuber (块茎 kuài jīng / 块根 kuài gēn)

This is partial information on the herb's TCM properties. More detailed information is available on the herb's dedicated page

Product Details

Manufacturing, supplier, and product specifications

Product Type

Granules

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Botanical & Sourcing

Quality Indicators

High-quality Shu Di Huang pieces are jet-black (黑如漆, 'black as lacquer') with a glossy, oily sheen on the surface. The texture should be soft, pliable, and sticky (moist and flexible, not dry or brittle). Cross-section should be uniformly dark black and glistening. The taste should be distinctly sweet (甜如饴, 'sweet as malt sugar') without bitterness or an off-putting sour note. It should feel heavy and dense for its size. A faint aroma of wine may be present from processing. Avoid pieces that are dry, dull, grayish, excessively hard, or crumbly, as these indicate poor processing or age. The stickiness when handled is a positive sign of high polysaccharide content.

Primary Growing Regions

The premier source is Henan Province, particularly the Jiaozuo (焦作) area, historically known as Huaiqing Prefecture (怀庆府). This is one of the famous 'Four Great Huai Medicines' (四大怀药). The region sits on the north bank of the Yellow River at the southern foot of the Taihang Mountains, with sandy loam soil rich in trace minerals from underground water seepage, providing ideal conditions for Rehmannia cultivation. Studies show the catalpol content of Jiaozuo-produced roots is vastly higher than material from other provinces. Other growing regions include Shandong, Shanxi, Hebei, and parts of Liaoning, but Huai Di Huang from Jiaozuo remains the recognized 'authentic terroir' (道地药材) variety.

Harvesting Season

Autumn (typically October to November), when the roots have accumulated maximum nutrients after the growing season.

Supplier Information

Treasure of the East

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Miscellaneous Info

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Usage & Safety

How to use this herb and important safety information

Important Medical Disclaimer

The information provided here is for educational purposes only and is not intended as medical advice or to replace consultation with a qualified healthcare professional. This herb is a dietary supplement and has not been evaluated by the FDA. It is not intended to diagnose, treat, cure, or prevent any disease.

Always consult with a qualified healthcare provider, particularly if you are pregnant, nursing, have a medical condition, or are taking other medications. Discontinue use and consult your healthcare provider if you experience any adverse reactions.

Recommended Dosage

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Instructions for safe storage and consumption

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Traditional Dosage Reference

Standard

9–30g

Maximum

Up to 60g in severe Blood or Yin deficiency (as used by Zhang Jingyue in formulas like Zhen Yuan Yin), under practitioner supervision only.

Notes

Use lower doses (9–15g) when nourishing Blood as part of a balanced formula or for mild Yin deficiency. Use moderate doses (15–30g) for significant Liver-Kidney Yin depletion, Blood deficiency with dizziness, or chronic wasting conditions. Higher doses (30–60g) were used by Zhang Jingyue for severe Qi collapse with Yin exhaustion, but require careful monitoring. When digestion is weak, always combine with Chen Pi (3–6g) or Sha Ren (3–5g) to counteract its cloying nature. Stir-frying with ginger juice (姜汁炒) reduces its tendency to cause digestive stagnation. In Yin-nourishing formulas, it serves as the chief herb and requires adequate dosage to be effective.

Processing Methods

Processing method

Dried raw Rehmannia root (Sheng Di Huang) is mixed with approximately 30% yellow rice wine (huangjiu), then repeatedly steamed and sun-dried. Traditionally this involves nine cycles of steaming and drying (九蒸九晒) until the root is uniformly black, oily, soft, and sticky throughout. Auxiliary materials such as Sha Ren (Amomum) and Chen Pi (tangerine peel) may be added during processing.

How it changes properties

Processing fundamentally transforms the herb. Temperature shifts from Cold (Sheng Di Huang) to Slightly Warm (Shu Di Huang). The bitter taste largely converts to sweet. The cooling, heat-clearing, blood-cooling actions of the raw form are replaced by warming, blood-tonifying, Yin-nourishing, and Essence-filling actions. The iridoid glycoside catalpol content decreases dramatically during processing, while monosaccharides and 5-HMF increase significantly. The herb becomes much richer and stickier, gaining its characteristic deep nourishing capacity.

When to use this form

Use Shu Di Huang (the prepared form) whenever the goal is to nourish blood, replenish Yin, and fill Essence. This is the standard form used in all blood-tonifying and Yin-nourishing formulas. Do NOT use when there is active heat in the blood requiring cooling, bleeding from blood heat, or febrile disease. Those situations require Sheng Di Huang instead.

Toxicity Classification

Non-toxic

Shu Di Huang is classified as non-toxic in the Chinese Pharmacopoeia and the Shen Nong Ben Cao Jing. No toxic components have been identified. Animal experiments have not demonstrated toxicity at standard or elevated doses, though one study noted it may raise cholesterol levels in animals. The primary clinical concern is not toxicity but rather its very rich, cloying (滋腻) nature, which can burden weak digestion. This is managed by combining it with Qi-moving herbs like Chen Pi (aged tangerine peel) or Sha Ren (Amomum) rather than by dose restriction. Classically, processing with ginger juice (姜汁) was recommended to reduce its tendency to cause digestive stagnation.

Contraindications

Caution

Spleen and Stomach deficiency with poor digestion, abdominal bloating, or loose stools. Shu Di Huang is very rich and cloying (滋腻) and can obstruct the digestive system in those with weak Spleen function, causing fullness and loss of appetite.

Caution

Excessive Phlegm or Dampness accumulation. The sticky, heavy nature of Shu Di Huang can worsen Phlegm-Dampness conditions, leading to chest oppression and nausea.

Avoid

Active external pathogenic invasion (common cold, fever, flu). Using this tonifying herb during an acute infection can 'trap the pathogen inside' (闭门留寇), making the illness harder to resolve.

Caution

Qi stagnation with significant bloating or distension. The heavy, cloying nature of Shu Di Huang can worsen Qi stagnation symptoms.

Caution

Excess Heat or Fire patterns without underlying deficiency. Shu Di Huang is slightly warm and tonifying, which is inappropriate for conditions of pure excess Heat.

Caution

Daybreak diarrhea (五更泄泻) associated with Spleen-Kidney Yang deficiency when used alone without warming, Spleen-supporting herbs, as the cloying nature can further burden weak digestion.

Special Populations

Pregnancy

Generally considered safe at standard doses during pregnancy. Shu Di Huang is a nourishing Blood and Yin tonic without uterine-stimulating, Blood-moving, or downward-draining properties. It appears in classical prenatal formulas for Blood nourishment. However, its cloying nature may worsen nausea and digestive issues common in pregnancy. If used, combining with Qi-regulating herbs (Chen Pi, Sha Ren) is advisable. High doses should be avoided without practitioner guidance.

Breastfeeding

No specific concerns have been documented regarding breastfeeding. Shu Di Huang is a nourishing tonic traditionally used in postpartum recovery formulas to replenish Blood lost during childbirth. Its Blood-tonifying properties may support lactation indirectly by nourishing the mother's constitution. The main consideration is its cloying nature, which could cause digestive discomfort in mothers with weak Spleen function. Standard doses with appropriate supporting herbs are considered safe during breastfeeding.

Pediatric Use

Can be used in children at appropriately reduced doses, typically one-third to one-half the adult dose depending on age and body weight. It appears in the classical pediatric formula Liu Wei Di Huang Wan from Qian Yi's Xiao Er Yao Zheng Zhi Jue, used for children with Kidney deficiency showing delayed fontanelle closure, slow development, or night sweats. Given its cloying nature, children with poor appetite or loose stools should use it cautiously, and combining with digestive-supporting herbs is especially important in pediatric use.

Drug Interactions

Antidiabetic medications: Rehmannia extracts have demonstrated blood glucose-lowering effects in animal studies. Concurrent use with insulin or oral hypoglycemic agents (metformin, sulfonylureas) may theoretically potentiate their effects, increasing hypoglycemia risk. Blood glucose should be monitored.

Anticoagulant and antiplatelet medications: Research has shown that processed Rehmannia has fibrinolytic activity and may inhibit thrombus formation. Use caution when combining with warfarin, heparin, or antiplatelet drugs (aspirin, clopidogrel), as there may be an additive effect on bleeding risk.

Immunosuppressants: Rehmannia polysaccharides have demonstrated immunomodulatory activity (both stimulating and suppressing aspects of immune function in different studies). Patients on immunosuppressive therapy should use Shu Di Huang with caution.

Dietary Advice

Avoid cold, raw foods and excessive greasy foods while taking Shu Di Huang, as these further burden the Spleen and can worsen the herb's cloying effect on digestion. Classically, radishes (萝卜), scallion whites (葱白), chive whites (韭白), and Chinese garlic (薤白) were said to reduce or counteract its tonifying effect and should be avoided. Warm, easily digestible foods such as congee, cooked grains, and lightly cooked vegetables are ideal accompaniments. A small amount of ginger in meals can help offset any digestive heaviness.

Cautions & Warnings

Although this herb is typically safe for most individuals, it may cause side effects in some people. Pregnant women, nursing mothers, postpartum women, and those with liver disease should use the formula with caution.

As with any Chinese herbal remedy, it is advisable to seek guidance from a qualified TCM practitioner before beginning treatment.