Black soybean skin is the seed coat of the black soybean, a legume plant. The plant morphology is detailed in the "Black Soybean" section. The black soybeans are soaked in water, allowed to germinate, and then the seed coat is rubbed off and dried. It is stored in a dry place. Let's take a look at the specific indications and usage with the author!
[Other Names] Black bean skin (from "Jiangsu Materia Medica").
[Source] It is the seed coat of the black soybean, a legume plant. The plant morphology is detailed in the "Black Soybean" section.
[Processing] The black soybeans are soaked in water, allowed to germinate, and then the seed coat is rubbed off and dried. It is stored in a dry place.
[Medicinal Material] The dried seed coat is mostly irregular fragments, with a brown-black or black outer surface often accompanied by a layer of gray-white substance.
In larger fragments, a long circular hilum can be seen. The inner surface is dark gray to dark brown and smooth. The best quality is dry, black, and free from impurities.
Mainly produced in Jiangxi and Jiangsu.
The current commercial black bean skin (also known as skin bean skin or material bean skin) is the same as this material. Skin beans were originally mentioned in "Compendium of Materia Medica," and their original plants have been studied in various dynasties, but there is no conclusion yet.
[Chemical Composition] Black soybean skin contains chicoric acid and luteolin-3-glucoside, as well as 18% pectin. It also contains acetic acid and various sugars.
[Properties and Taste] ① "New Edition of Chinese Materia Medica": "Slightly sweet, cool." ② "Pharmacognosy": "Warm in nature, sweet in taste."
[Effects and Functions of Black Soybean Skin]
Nourishing blood and dispersing wind. Treats yin deficiency with restlessness, night sweats, dizziness, and headaches.
① "Compendium of Materia Medica": "Used to treat acne and eye disorders, mashed and applied to children's urinary scabies."
② "Dietary Recipes from Suixiju": "Stops night sweats."
③ "New Edition of Chinese Materia Medica": "Clears the mind, disperses wind-heat, treats headaches."
④ "Modern Practical Chinese Medicine": "It is a cooling and nourishing tonic, with detoxifying and diuretic effects."
⑤ "Pharmacognosy": "Nourishes blood, dispels wind, improves vision and essence. Treats yin deficiency with restlessness, excessive sweating or night sweats, dizziness, blurred vision, and wind arthralgia."
[Dosage and Administration] Oral administration: Decoction, 9-15 grams.
