Mǔ Lì (牡蛎) — Oyster shell

On this page

1. Overview
2. Properties
3. Actions and indications
4. Key formulas
5. Modern research
6. Cautions and contraindications
7. Treatment at my clinic

1. Overview

Mǔ Lì (牡蛎) — Ostrea gigas / Ostrea rivularis — is known in English as Oyster shell. It belongs to the category of Herbs that calm the Spirit in the Chinese Materia Medica and is one of the important herbs in traditional Chinese medicine (TCM). It is used in Chinese herbal medicine as a component of classical herbal formulas and in tailored prescriptions.

I prescribe Mǔ Lì as part of bespoke herbal formulas from pharmaceutical-grade granules sourced from Sun Ten in Taiwan. Herbs are always combined with other herbs selected to match the patient’s individual TCM pattern. Online consultations are available for patients who cannot attend my clinic in person.

2. Properties

3. Actions and indications

Principal actions

1. Anchors the Liver Yang and calms the Mind — powerful sedating and stabilising mineral
2. Softens hardness and dissipates nodules — the most important mineral for swellings and masses
3. Astringes and prevents leakage of fluids
4. Absorbs acid and stops pain — used for gastric acid

Indications

1. Anxiety, palpitations and insomnia from Liver Yang rising and Heart disturbance
2. Hypertension from Liver Yang rising — the primary mineral combination with Long Gu
3. Goitre, lymph node swellings, scrofula and thyroid nodules — softens Phlegm accumulation
4. Spermatorrhoea and uterine bleeding from astringent action
5. Gastric acid and stomach pain from Liver invading the Stomach
6. Night sweats and spontaneous sweating

4. Key formulas containing Mǔ Lì

Mǔ Lì appears in the following key formulas:

• Gui Zhi Jia Long Gu Mu Li Tang
• Er Xian Tang

See the full Chinese herbal medicine formula directory for detailed information on all 70 classical formulas.

5. Modern research

Oyster shell (Mu Li) is composed primarily of calcium carbonate (CaCO3) with trace minerals. Its clinical effects are attributed to the calcium content, its alkaline nature and its complex mineral matrix. Research confirms anti-anxiety, sedative, antacid and anti-inflammatory properties. The combination Long Gu-Mu Li has been specifically studied for anxiety, hypertension and hyperthyroidism, with clinical evidence supporting all three applications. Mu Li has documented thyroid-modulating effects and is used in TCM formulas for both hyperthyroidism and thyroid nodules.

6. Cautions and contraindications

Avoid in patients with external pathogenic conditions. Avoid in patients with Cold in the Middle Jiao without Phlegm accumulation. The raw form (Sheng Mu Li) is used for softening hardness; the calcined form (Duan Mu Li) is used for astringent actions.

Important: Chinese herbs should always be prescribed by a fully qualified herbalist who is a member of the Register of Chinese Herbal Medicine (RCHM). Never self-prescribe or self-administer Chinese herbs without professional guidance. Dr (TCM) Attilio D’Alberto is a member of the RCHM with over 25 years of clinical experience.

7. Treatment at my clinic

I prescribe Mǔ Lì as part of tailored herbal formulas for a range of conditions including Anxiety, Insomnia, High blood pressure, Menopausal symptoms. Every prescription is individually formulated following a full TCM assessment and adjusted throughout treatment as the pattern responds.

I see patients in person at my clinic in Wokingham, Berkshire. Online Chinese herbal medicine consultations are available throughout the UK and internationally. Visit the prices page for consultation fees.

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