Korean Rehmannia Root – Prepared Shu Di Huang Blood Tonic 5.25oz
What Is Prepared Rehmannia? (Shu Di Huang / Sukjihwang)
Prepared Rehmannia root — known as Shu Di Huang in Chinese herbalism and Sukjihwang (숙지황) in Korean — is one of the most respected tonic herbs in traditional East Asian wellness. It's a foundational ingredient practitioners turn to for deeply nourishing the blood and replenishing the body's reserves.
This is not the raw root. "Prepared" means it has gone through a traditional, labor-intensive transformation — and that process is exactly what makes it so valued.
The "Black Diamond" — Traditionally Steamed for Depth
Raw Rehmannia root is pale and cooling. To create prepared Rehmannia, the root is repeatedly steamed and sun-dried — traditionally up to nine cycles (a method known in Korea as gujeung-gupo, "nine steamings and nine dryings").
This patient process transforms the root completely. It turns a deep, glossy black, develops a soft, chewy, almost date-like texture, and takes on a rich, naturally sweet, molasses-like flavor. Herbalists sometimes call the result a "black diamond" — and that dark, sticky appearance isn't a flaw. It's the visible proof of proper traditional preparation. A pale or dry "prepared" Rehmannia simply hasn't been made correctly.
Why Korean-Grown Rehmannia Matters
Search for "Shu Di Huang" on most marketplaces and you'll find bulk Chinese-grown root with little origin transparency — and common complaints about poor packaging and quality. Kosbee Prepared Rehmannia is 100% Korean-grown, cultivated under Korea's strict agricultural standards, traditionally prepared, and hygienically sealed in a resealable pouch with a clear Nutrition Facts panel.
Each 5.25 oz / 150 g pouch contains 100% pure Korean prepared Rehmannia root — naturally sweet, with zero added sugar.
A Naturally Mineral-Rich Tonic Herb
- Potassium 9% DV (436 mg) per 10 g serving
- Iron 6% DV (1 mg) per serving
- 0 g added sugar — the deep sweetness is entirely natural
- Single ingredient: 100% Korean prepared Rehmannia root
- Traditionally used as a Yin and Blood tonic in East Asian herbalism*
Traditionally a Blood & Yin Tonic
In traditional East Asian herbalism, prepared Rehmannia is the classic herb for nourishing the blood and replenishing Yin — the body's deep, restorative reserves.* It's often chosen by those navigating fatigue, busy life seasons, or hormonal transitions, and it is a cornerstone herb in women's wellness formulas.*
How to Use Rehmannia Root
1. Vitality Tea (Sukjihwang-cha)
Add 10–20 g of Rehmannia to 1 liter (4 cups) of water. Bring to a boil, then reduce to low and simmer gently for at least 1 hour. Brewed on its own, it produces a tea as dark as black coffee with a smooth, naturally sweet, molasses-like flavor.
Digestion tip: Rehmannia is rich and "heavy" by nature. Simmering it with a few slices of fresh ginger makes the tea easier on the stomach — a traditional pairing.
2. Si Wu Tang — The Classic Women's Wellness Blend
Prepared Rehmannia is the base of Si Wu Tang ("Four Substance Decoction"), one of the most famous traditional women's wellness formulas. Simmer Rehmannia together with Angelica root (dang gui), Cnidium (chuan xiong), and White Peony root (bai shao) for a time-honored restorative blend.
3. Restorative Soup Base
Add a few pieces to samgyetang, Korean galbitang, or any long-simmered bone broth. Rehmannia deepens the broth's color and flavor while turning an everyday soup into a nourishing restorative meal.
Who It's For
- Women seeking hormonal harmony — those exploring natural East Asian herbs for menstrual comfort, postpartum recovery, or menopausal balance
- TCM and acupuncture patients advised to take a "Yin tonic" or "Blood tonic" who want a trustworthy, traceable prepared Rehmannia to brew themselves
- Adults facing chronic fatigue or burnout who want a deep, restorative tonic rather than a quick caffeine fix
- Home herbalists assembling traditional formulas like Si Wu Tang
Important Safety Information
⚠ Heavy and rich by nature. Rehmannia is considered "cloying" in traditional herbalism — it can be hard to digest for those with weak digestion or frequent bloating if taken alone in large amounts. Simmering with digestive herbs like fresh ginger is strongly recommended.
⚠ Blood sugar. Rehmannia may affect blood sugar levels. If you take diabetes medication, consult your doctor before regular use.
⚠ Pregnancy and nursing: Please consult a healthcare provider before consuming.
⚠ Brew, don't snack. Rehmannia is used as a brewing and decoction herb. Simmer it, then strain — only the resulting tea or broth is consumed.
Storage — Refrigeration Recommended
Because prepared Rehmannia is steamed and naturally moist and sticky, proper storage matters. After opening, seal the zipper pouch tightly and store in the refrigerator to preserve freshness and prevent spoilage. For longer storage, the freezer works well. Best used within 6 months of opening.
Frequently Asked Questions
Why is this root so black and sticky? Is that normal?
Yes — that's exactly how properly prepared Rehmannia should look. The deep black color and soft, sticky, date-like texture are the direct result of repeated traditional steaming and drying. A pale, dry "prepared" Rehmannia hasn't been made correctly. The black, glossy appearance is the mark of authentic preparation.
Is Kosbee Rehmannia from Korea or China?
100% grown and traditionally prepared in Korea. Most "Shu Di Huang" sold online is bulk Chinese-grown with limited origin transparency. Kosbee Rehmannia is cultivated under Korea's strict agricultural standards, hygienically sealed, and clearly labeled with country of origin and Nutrition Facts.
How do I make Rehmannia easier to digest?
Rehmannia is rich and "heavy" by nature. The traditional solution is to simmer it with digestive herbs — fresh ginger is the most common and effective. Start with smaller amounts, brew it well for at least an hour, and avoid taking large quantities alone if you have sensitive digestion.
What is Si Wu Tang and how does Rehmannia fit in?
Si Wu Tang ("Four Substance Decoction") is a classic traditional women's wellness formula. Prepared Rehmannia is its foundational ingredient, simmered together with Angelica root, Cnidium, and White Peony root. It's one of the most well-known blood-nourishing blends in East Asian herbalism.
How long does one pouch last?
One 5.25 oz (150 g) pouch provides approximately 15 servings at 10 g each. Used for daily tea or blended into formulas, a pouch typically lasts about two weeks to a month, depending on how frequently and how strongly you brew.
* 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.
