Nacre is made of the shell of fresh-water clams, Hyriopsis cumingii (Lea) and Cristaria plicata (Leach) (Fam. Unionidae) or peral oyster, Pteria martensii (Dunder) (Fam. Peteriidae) by calcination after removal of the curticle.

Action: To subdue hyperactivity of the liver, to calm the nerves, and to improve vision.

Indications: Headache, dizziness, fidgetness and insomnia; inflammation of the eye due to heat in the liver; blurred vision in deficiency conditions of the liver.

Usage : To be decocted before other ingredients.

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