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The shell of Crassostrea gigas, C. talienwhanensis, or C. rivularis (Ostreidae). Enters the Liver, Gallbladder, and Kidney channels. Salty and cool, its heavy quality settles the spirit for palpitations and insomnia, pacifies Liver yang for dizziness and tinnitus, softens hardness and dissipates nodules for scrofula and goiter, and astringes to secure for sweating, emission, and leukorrhea. Classically paired with long gu in Gui Zhi Jia Long Gu Mu Li Tang and Chai Hu Jia Long Gu Mu Li Tang.
长于平肝潜阳、软坚散结
收敛固涩与制酸止痛作用增强
煎服15–30g，宜打碎先煎；制酸止痛宜煅用研末冲服每次1–3g。
Reference range for non-pregnant adults. Not a personalized prescription. Pregnancy, lactation, and pediatric use require specialist supervision.
Protective guidance only — when to avoid or use with caution. This block deliberately omits pregnancy, lactation, and pediatric dosing: any such use must be managed by a qualified TCM practitioner or appropriate specialist.
虚而有寒、肾虚无火、精寒自出者忌用。质重碍胃，脾胃虚弱者久服宜配健脾和胃之品。
海洋贝壳类矿物药，含碳酸钙，长期大量服用宜监测胃肠功能及钙代谢。过敏体质者少数可见海产品过敏反应。
味咸，平。主伤寒寒热，温疟洒洒，惊恚怒气，除拘缓鼠瘘，女子带下赤白。久服强骨节，杀邪鬼，延年。
上品
@misc{bencaodian-mu-li,
author = {{Bencaodian Editorial}},
title = {Mǔ Lì 牡蛎 (Oyster Shell) — Ostreae Concha},
year = {2026},
howpublished = {Bencao Dian: A Bilingual Knowledge Graph of Traditional Chinese Medicine},
url = {https://bencaodian.org/en/herbs/mu-li},
urldate = {2026-04-17},
note = {CC BY-SA 4.0}
}© Bencaodian Editorial · Licensed under CC BY-SA 4.0
牡蛎壳主含碳酸钙及微量元素，具中和胃酸、镇静安神、软坚散结及收敛固涩作用。
Oyster shell is chiefly calcium carbonate with trace minerals, providing antacid, sedative, soften-hardness, and astringent effects.
碳酸钙中和胃酸并具吸附收敛作用；煅牡蛎钙溶解度高。
Calcium carbonate neutralizes gastric acid and has adsorbent-astringent action; calcined oyster shell has higher calcium solubility.
牡蛎平肝潜阳、重镇安神、软坚散结，煅用敛汗涩精。
Anchors liver yang, calms spirit, softens hardness; calcined form astringes sweat and essence.
与四环素、喹诺酮等药物同服可降低吸收，应间隔 2 小时。
Calcium may reduce absorption of tetracyclines and fluoroquinolones — separate dosing by at least 2 hours.
《中国药典》以碳酸钙含量（不少于 94.0%）为质量指标。
Chinese Pharmacopoeia specifies calcium carbonate content (≥94.0%) as the quality marker.
This section is provided for academic reference only and does not constitute medical advice.