Rehmannia and Silkie Chicken: A Classic Yin-Nourishing Medicinal Soup

Introduction to Medicinal Diet

Sheng Di Huang (Rehmanniae Radix – Chinese Foxglove Root) stewed with black-boned chicken (silkie chicken) is a classic Chinese medicinal diet, originating from traditional Chinese medicinal dietary therapy theory. The main ingredients are Sheng Di Huang and black-boned chicken, with a small amount of seasoning, simmered over low heat. Sheng Di Huang is cold in nature, sweet and bitter in taste, and enters the Heart (HT), Liver (LR), and Kidney (KI) meridians. It has the effects of clearing heat and cooling blood, nourishing yin and generating fluids. Black-boned chicken is neutral in nature, sweet in taste, and enters the Liver (LR) and Kidney (KI) meridians, capable of tonifying the liver and kidney, nourishing yin and enriching blood, and reducing deficiency heat. Combined, they can both clear deficiency heat, cool blood and stop bleeding, and nourish the yin of the liver and kidney, making them particularly suitable for various conditions caused by Yin deficiency with internal heat and Blood-Heat with reckless movement.

This medicinal diet is widely popular among the people, especially in southern regions, and is often used as an excellent tonic for women after menstruation or during menopause. The soup has a clear, slightly yellow color; the chicken is tender and falls apart easily; the broth is savory with a hint of sweetness and a mild herbal aroma that is readily acceptable. Modern nutritional research has further discovered that Rehmanniae Radix (Rehmannia root) contains active compounds such as catalpol and rehmannia polysaccharides, while Silkie chicken is rich in high-quality protein, melanin, and various trace elements. Their synergistic action has positive effects on immunomodulation, antioxidation, and improvement of anemia.

Origins and Culture

The earliest record of Silky fowl cooked with Rehmannia glutinosa (Shengdi) can be traced back to the Ming dynasty *Compendium of Materia Medica* (*Bencao Gangmu*), which describes that “Silky fowl tonifies deficiency, fatigue, and emaciation” and “Rehmannia glutinosa treats blood heat.” In the Qing dynasty, the *Sui Xi Ju Dietary Spectrum* (*Suixiju Yinshi Pu*) further combined the two, stating that “Silky fowl boiled together with Rehmannia glutinosa benefits the Liver and Kidneys and retreats bone steaming.” To this day, this dish remains a staple in household medicinal food soups and a vivid embodiment of the TCM principle of “homology of medicine and food.”

Efficacy of Medicinal Diet

Rehmannia glutinosa (Chinese foxglove root) stewed with silkie chicken combines the three major effects of clearing heat, nourishing yin, and supplementing blood. It can effectively improve symptoms caused by yin deficiency with effulgent fire, such as dry mouth and tongue, feverish sensation in the palms, soles, and chest, night sweats and insomnia, as well as malar flush and tidal fever. It also serves as an adjunctive regulation for conditions due to blood heat, including preceded menstrual cycle, heavy menstruation with bright red blood and clots, skin purpura, and gingival bleeding.

From a modern medical perspective, this medicinal diet, through the anti-inflammatory, hypoglycemic, and hepatoprotective effects of Rehmannia glutinosa (Chinese Foxglove Root), combined with the high-quality protein and iron provided by Black-bone Chicken, helps regulate endocrine function, increase hemoglobin levels, and alleviate chronic fatigue. Long-term moderate consumption has a beneficial effect on female chloasma (melasma), tendencies toward premature aging, as well as the irritability, hot flashes, and sweating associated with menopausal syndrome.

Functions of Traditional Chinese Medicine

In TCM theory, Shengdihuang (Rehmanniae Radix) is the essential herb for “clearing heat and cooling blood, nourishing yin and generating fluids”. Its nature is cold, enabling it to clear heat at the ying and blood levels while also nourishing yin fluids. It is frequently used for warm febrile diseases with heat entering the ying and blood, damage to yin due to febrile illness, and intestinal dryness with constipation. The black-bone chicken (Silkie chicken, Gallus gallus domesticus) specifically enters the Liver and Kidney channels, excels at nourishing yin and blood while reducing bone steaming and tidal fever, and is a common ingredient for consumptive disease with emaciation, irregular menstruation, uterine bleeding, and leukorrhea.

The two ingredients are combined, one clearing and one tonifying, so that heat is cleared without damaging yin, and tonification occurs without agitating heat. If a small amount of fresh ginger and cooking wine is added to the formula, they can remove the fishy odor of the black-boned chicken (silkie), while the warming and dispersing nature of ginger counteracts the cold-cool property of raw rehmannia (Sheng Dihuang), making the entire formula more balanced. The primary mechanism of action of this medicinal diet lies in “nourishing water to nourish wood (Zi Shui Han Mu) and clearing heat to cool the nutritive level (Qing Re Liang Ying)”—that is, by enriching the yin of the liver and kidney (water) to restrain the hyperactive liver yang (wood), and by cooling the blood to stabilize the blood aspect, thereby achieving a balance of yin and yang.

Suitable Populations

This medicated diet is primarily suitable for individuals diagnosed with Yin deficiency with internal heat or blood heat constitution in Traditional Chinese Medicine. Typical characteristics include: thin body build, flushed complexion or redness over both cheekbones, heat in the palms and soles, dry mouth and throat, dry stools, scanty dark yellow urine, red tongue with little coating, and thin, rapid pulse. It is especially suitable for daily regulation of the following groups of people:

1. Perimenopausal women: presenting with tidal fever, night sweats, vexation, insomnia, and irregular menstruation; 2. Individuals with chronic strain: long-term sleep deprivation, excessive mental exertion, smoking, and alcohol consumption leading to depletion of yin fluids, manifesting as five-palm heat, dry mouth, and dry eyes; 3. Patients with blood-heat gynecological disorders: such as preceded menstruation, excessive menstrual flow, deep-red menstrual blood, skin eruptions during menses, or gingival bleeding; 4. Convalescents after febrile illness: such as following cold or fever with injury to yin fluids and residual heat, presenting with red tongue with scant coating, and general weakness.

Contraindicated populations

Although Sheng Di (Rehmanniae Radix) stewed with black-bone chicken has many benefits, it is not suitable for everyone. The following individuals should consume it with caution or avoid it:

1. For those with Spleen-Stomach Yang Deficiency: Rehmanniae Radix (Rehmannia root, *Rehmannia glutinosa*) is cold and cool in nature. If the patient already has symptoms of Spleen-Stomach Yang Deficiency such as abdominal distension, diarrhea, poor appetite, loose stools, cold extremities, and a pale, enlarged tongue with a white, slippery coating, consumption may aggravate the deficiency cold, leading to diarrhea or indigestion. 2. For those with External Wind-Cold or Excess Heat Pattern: In cases of ongoing common cold with fever (aversion to cold, clear nasal discharge, cough with white phlegm, etc., indicating Wind-Cold), or internal Excess Fire (high fever, intense thirst, constipation, thick yellow tongue coating, etc.), tonifying herbs should be avoided to prevent “locking the bandits inside” (i.e., trapping pathogens). 3. For pregnant women: Although Silkie chicken (black-boned chicken) is nourishing, Rehmanniae Radix has the effects of quickening the Blood and cooling the Blood. Caution is advised during early pregnancy (especially the first trimester). If consumption is deemed necessary, it must be used in small amounts under the guidance of a licensed TCM practitioner. 4. For those with hypotension or a tendency toward diarrhea: Decoctions of Rehmanniae Radix have a mild hypotensive and laxative effect. Individuals with weak constitution, low blood pressure, or a tendency to diarrhea should limit the dosage, or combine it with spleen-strengthening herbs such as Atractylodis Macrocephalae Rhizoma (Atractylodes, *Atractylodes macrocephala*) and Dioscoreae Rhizoma (Chinese yam, *Dioscorea opposita*).

Ingredient Formula Ratio

Here is the precise recipe for a single serving (approximately 2-3 bowls of soup): – Raw Rehmannia Root (Rehmanniae Radix): 30 g (dried slices, preferably large pieces with a dark, shiny cross-section) – Black-bone Chicken (Gallus gallus domesticus): 500 g (about half a chicken, remove innards, wash, cut into pieces) – Fresh Ginger (Zingiberis Rhizoma Recens): 3-4 slices (about 10 g, sliced) – Chinese Red Dates (Jujubae Fructus): 6 pieces (pitted, about 20 g) – Cooking Wine: 10 ml (about 1 tablespoon) – Salt: 3 g (for final seasoning) – Clean Water: 1500-2000 ml (adjust according to the size of the simmering pot)

If a richer flavor is preferred, you may add 15g of Lycium barbarum (Goji berry) and 10g of Astragalus membranaceus (Astragalus root) as appropriate, but be mindful of the changes in medicinal properties to avoid being overly warm and tonifying or cloying. Additionally, a small amount of Citrus reticulata (Tangerine peel) (3g) can be added to regulate qi and harmonize the stomach, preventing Rehmannia glutinosa (Raw Rehmannia) from obstructing the stomach.

Preparation Method

Step 1: Prepare the ingredients. Soak the Silky Fowl (Gallus domesticus var.) pieces in cold water for 10 minutes, changing the water 2–3 times to remove blood. Quickly rinse Rehmannia root (Rehmanniae Radix) in clean water to remove dust. Wash and pit the red dates (Ziziphi Jujubae Fructus). Slice fresh ginger (Zingiberis Rhizoma Recens) and set aside.

Step Two: Blanching to remove fishy odor. Add enough cold water to a pot and place the black-boned chicken pieces in. Bring to a boil over high heat, skim off any foam that rises, then continue boiling for another 2 minutes. Remove the chicken pieces and rinse off any residual blood on the surface with warm water. Note: Do not rinse with cold water, as this can cause the meat to contract and become tough.

Step 3: Stewing. Place the blanched black-boned chicken pieces, raw Rehmannia root (Radix Rehmanniae Recens), ginger slices, Chinese red dates (Fructus Jujubae), and cooking wine together in a clay pot or stewing vessel. Add water until the liquid is about two finger-widths above the ingredients. Bring to a boil over high heat, then immediately reduce to low heat, cover, and simmer for 1.5 to 2 hours, until the chicken is tender and the broth turns a pale yellow.

Step 4: Season and remove from heat. Five minutes before turning off the heat, add salt and stir well. At this point, you can taste it. If you feel the medicinal flavor is too strong, you may cook for another two minutes to evaporate some of the odor. Finally, skim off any excess oil from the surface, then serve and drink. If using a regular soup pot, it is recommended to simmer over low heat throughout and add hot water as needed to avoid drying out.

Tips for Consumption

1. **Optimal Consumption Time:** It is recommended to take it warm on an empty stomach before breakfast or lunch for better absorption. Avoid drinking large amounts before bedtime, as *Rehmanniae Radix* (Chinese Foxglove Root, raw) has a diuretic effect, which may lead to increased nighttime urination and affect sleep. 2. **Frequency and Duration:** As a therapeutic diet, consume 1–2 times per week. After continuous use for 2–3 weeks, take a one-week break before resuming. For those with pronounced deficiency-heat, it may be taken for 5 consecutive doses, but bowel movements should be monitored. If diarrhea occurs, reduce the dosage or temporarily discontinue. 3. **Compatibility Precautions:** If taking Western medications simultaneously, maintain an interval of at least one hour. Patients on anticoagulant medications (e.g., warfarin) should consult a physician before consumption, as *Rehmanniae Radix* may affect coagulation function. Additionally, this diet should not be taken with radish or strong tea, as this may reduce efficacy or cause abdominal distension. 4. **Individualized Adjustments:** For individuals with a Cold pattern constitution, add 2–3 slices of *Astragali Radix* (Astragalus) or a small amount of *Angelicae Sinensis Radix* (Chinese Angelica). If dry mouth is prominent, cook with 10 g of *Ophiopogonis Radix* (Dwarf Lilyturf Tuber) to enhance yin-nourishing effects. For children, the elderly, or those recovering from illness with weakened constitution, halve the dosage and prepare under the guidance of a Chinese medicine practitioner.