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Sour Jujube Kernel
Sour jujube kernel is the seed of Ziziphus spinosa Hu and Z. jujuba Mill. var spinosa (Bge.) Hu ex H.F.
Chow. It has brain tonic, tranquilizing, body fluid secretory promoting, and excessive perspiration
preventing properties. The most common traditional uses for sour jujube kernel are neurasthenia,
insomnia, nightmares, night sweat, forgetfulness, palpitations, and thirst.
Sour jujube kernel is probably the most commonly used sedative herb in China for treating sleep-related problems such as insomnia and nightmares. Its first recorded use dates back two thousand
years. Since then, it has become a major ingredient of Chinese sedative and hypnotic formulas,
some of which are well known and can be obtained over the counter in Chinese herb shops
throughout the world.
Sour jujube kernel is also used in soups and drinks for diet therapy. One recipe for rice soup in
Yin Zhan Zhen Yao (a diet herbal published in 1330 A.D.) simply calls for cooking 100 g of rice to
form a soup and then adding 15 g of roasted sour jujube kernel powder shortly before serving.
It is said to be good for palpitations, insomnia, excessive dreams (nightmares) and tightness of the
chest.
Sour jujube kernel contains a wide variety of chemical components, including flavonoids,
flavonoid glycosides, triterpenes and triterpene saponin glycosides, alkaloids, sterols,
fatty acids, cyclic AMP and cyclic GMP and others. Modern scientific studies have shown
it to have strong sedative and hypnotic effects in both humans and in experimental
animals (mice, rats, guinea pigs, cats, rabbits and dogs). As with most drug-oriented
modern scientific studies on herbs, no one single active principle has
been found. Rather, the flavonoid glycosides (spinosin, swertisin, and zivulgarin),
alkaloids and the saponins (jujubosides A and B) have all been shown to be active.
Perhaps that is the reason sour jujube kernel has been safely and effectively
used for over two thousand years!