Zhen Zhu (珍珠; Zhēn Zhū; Latin: Margarita; English: pearl) is the pearl formed when Pteria martensii (Dunker), Hyriopsis cumingii, Cristaria plicata, or a related bivalve is stimulated. In Chinese medicine it is a spirit-calming herb. It is sweet, salty, and cold, enters the Heart and Liver channels, and its core actions are to calm the spirit and settle fright, brighten the eyes and recede screens, resolve toxin and generate flesh, and moisten the skin and fade spots. It usually goes into pills and powders. The usual amount is only 0.1–0.3 g. External use is a suitable amount. It must be water-ground to a very fine powder.
It is not Zhen Zhu Mu. Pearl mother is the shell of those bivalves, salty and cold. It calms the Liver, subdues yang, calms the spirit, and settles fright. It is crushed and decocted first, and the dose is much larger. Pearl is the bead. Calming the spirit, receding screens, and generating flesh are more specific. Jewelry pearls and powder of unclear origin do not convert to the piece. Use a qualified product. Heavy metals must meet the standard. Fright-wind epilepsy and eye screens need a clinic. A cold weak spleen should not meet large amounts. Use caution in pregnancy. This is not a spot-fading product claim.
It is used most often for three patterns:
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Fright palpitations and insomnia, fright-wind epilepsy — fright-wind needs a clinic
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Red eyes and screens — seek care
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Sores that will not close, skin spots — external use needs pattern diagnosis
Sweet, salty, and cold, it is not a daily “spirit pearl” to keep increasing. Settling when there is no heat-fright obstructs the spleen and stomach.
When Heart and Liver have heat and the spirit is not quiet, fright palpitations and red eyes are common. Zhen Zhu is sweet, salty, and cold. It calms, recedes screens, and generates flesh, which is why it appears in spirit-calming pills and powders. It cools and settles more than it warms. Loose stools and fear of cold get worse if more is added.
Zhen Zhu is not a catch-all spirit or vision pearl. In middle-cold diarrhea, or when there is no heat-fright, using it alone can obstruct the spleen. A place in pills and powders should be decided by a licensed Chinese medicine practitioner after pattern diagnosis and confirmation of a qualified product.