Placenta, the medicinal use of which was introduced to China from the Ryukyu Islands during the T'ang dynasty (618-907), stimulates the production of milk and is already being used in a drug production in West Germany.
根據記載，紫河車是唐朝時由琉球國傳入，據有催乳作用，目前西德已將之製成藥劑使用。