Jujube is both a delicious fruit and an effective herbal remedy. Japanese research has shown that jujube increases immune-system resistance. Often confused for a date, jujubes are actually berries and are significantly more nutritious than the date palm. Jujube fruit is low in calories but rich in fiber, vitamins, and minerals. Jujube fruits have long been used in alternative medicine to treat conditions like Iron deficiency, insomnia and anxiety.