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Chinese Foxglove / Rehmannia (Rehmannia glutinosa)

Botanical Information

  • Family: Scrophulariaceae
  • Common Names: Chinese Foxglove, Rehmannia
  • Parts Used: Root (raw and processed)

Description

Rehmannia is a perennial herb native to China and widely used in Traditional Chinese Medicine (TCM). Its roots, either raw or processed, are known for their ability to nourish blood and yin, support kidney and liver function, and provide anti-inflammatory benefits.

Historical and Traditional Uses

  • Revered in TCM for nourishing the blood, replenishing yin, and promoting vitality.
  • Used to treat anemia, chronic fatigue, and conditions associated with yin deficiency.
  • Traditionally applied in cases of fever, inflammatory disorders, and hormone imbalances.

Constituents

  • Iridoid glycosides (catalpol)
  • D-glucosamine
  • Phenolic compounds
  • Polysaccharides
  • Tannins
  • Amino acids

Actions

  • Blood tonic
  • Yin tonic
  • Anti-inflammatory
  • Antioxidant
  • Antipyretic (reduces fever)
  • Immunomodulatory

Medicinal Uses

1. Kidney and Liver Support:
Rehmannia is commonly used to nourish the kidneys and liver, aiding in detoxification and improving energy levels.

2. Blood Nourishment:
The root’s blood-tonifying properties make it useful for addressing anemia, fatigue, dizziness, and pallor.

3. Hormonal Balance:
Rehmannia helps regulate hormones and is used in conditions such as menopause, menstrual irregularities, and adrenal fatigue.

4. Immune System Support:
Its immunomodulatory effects enhance the body’s natural defenses, making it useful for individuals prone to chronic infections.

5. Anti-inflammatory Relief:
Rehmannia is effective in managing inflammatory conditions such as arthritis, eczema, and allergies.

6. Fever Reduction:
In TCM, Rehmannia is used to cool the body, reduce fever, and treat heat-related conditions.

Preparation and Dosage

Decoction:

  • 1-2 tsp of dried Rehmannia root per cup of water. Simmer for 20-30 minutes and drink 1-2 times daily.

Tincture:

  • 2-5 ml of Rehmannia tincture, taken 2-3 times daily.

Capsules:

  • 300-600 mg of standardized extract, taken 1-2 times daily.

Powder:

  • 1-2 grams of powdered root can be added to teas or smoothies.

Precautions and Contraindications

  • Pregnancy and Lactation: Generally considered safe, but consult a healthcare provider before use.
  • Digestive Sensitivity: May cause mild digestive discomfort in some individuals.
  • Medication Interactions: May interact with blood pressure medications or diuretics.

Energetics (Traditional Medicine Perspectives)

  • Traditional Chinese Medicine: Nourishes blood and yin, tonifies the kidneys and liver, and cools excess heat.
  • Ayurvedic: Cooling and grounding, helping balance pitta and vata while mildly supporting kapha.

Combinations

  • For Kidney Support: Combine with astragalus and nettle.
  • For Blood Nourishment: Combine with dong quai and peony.
  • For Hormonal Balance: Combine with ashwagandha and licorice.

Harvesting and Storage

  • Harvesting: Roots are harvested in autumn when nutrient levels are highest.
  • Processing: The root can be used raw or steamed with wine, which enhances its tonic properties.
  • Storage: Store dried roots or powders in an airtight container in a cool, dark place.

Modern Research

Studies have confirmed Rehmannia’s role in immune modulation, hormone regulation, and inflammation reduction. Ongoing research is exploring its potential benefits in metabolic and neurodegenerative disorders.

Rehmannia remains a key herb in traditional and modern herbal medicine, valued for its blood-nourishing, kidney-supporting, and anti-inflammatory properties.