Oyster Shell

Mǔ Lì (Oyster Shell)

Overview:
Mǔ Lì, or Oyster Shell, is a traditional mineral medicine derived from the shells of marine oysters, mainly species like Ostrea gigas. In Traditional Chinese Medicine (TCM), Mǔ Lì is prized for its ability to anchor the spirit, soften hardness, disperse nodules, and consolidate essence. It is frequently used to calm anxiety, treat insomnia, manage hyperactivity of the Liver yang, and support conditions like night sweats and spontaneous sweating.

Zoological Origin:
The medicinal part of Mǔ Lì comes from the hardened shells of oysters, which are cleaned, dried, and often calcined (heated) to enhance their therapeutic effects. The shells are rich in calcium carbonate and trace minerals.

Traditional Uses in TCM:

1. Calms the spirit and anchors yang:
   Used to alleviate symptoms like palpitations, irritability, dizziness, and insomnia due to yin deficiency or Liver yang rising.

2. Softens hardness and resolves masses:
   Applied in conditions like goiter, scrofula, or abdominal masses.

3. Prevents leakage of fluids:
   Effective for spontaneous sweating, night sweats, spermatorrhea, or vaginal discharge due to deficiency syndromes.

4. Neutralizes stomach acid:
   Used in formulas to alleviate acid reflux or epigastric pain.

Pharmacological Properties:
Mǔ Lì is primarily composed of calcium carbonate, along with magnesium, iron, and trace elements. Modern studies highlight its sedative, antacid, and mineral-replenishing effects. It may also support bone health and aid in regulating autonomic nervous system activity.

Preparation and Dosage:

• Often calcined and ground into powder or decocted with other herbs.

• Typical dosage: 9–30 grams, depending on the form and treatment purpose.

• For topical use, finely powdered Mǔ Lì may be applied to ulcers or skin conditions.

Precautions:

• Use with caution in individuals with cold from deficiency or impaired digestion.

• Should be taken under the guidance of a qualified healthcare provider.

• Not recommended for long-term use in large doses without supervision due to its mineral density.