Sour jujube kernel extract properties, uses and production process Plant extract Sour jujube kernel extract is the dried mature seed extract of sour jujube of Rhamnaceae plant, the main medicinal components include saponins, flavonoids, fatty oils, etc., with the effect of tonifying the liver, nourishing the heart, astringent sweating, and generating fluids, which can be used for the symptoms of deficiency annoyance and insomnia, palpitations and excessive dreaming, excessive sweating, and fluid injury and thirst.