A herb from the east mainly China. They are filled with antioxidants mainly carotenoids such as beta-carotene and zeaxanthin. Good for maintaining eyesight, liver, improve circulation , immune system. You can but them in a Chinese market or herbal store. You can consume them raw , brewed in tea, or just drink the extracts. Its not good to consume too much along "blood thinners" medicine.
Good Luck.