决明子为豆科植物决明或小决明的干燥成熟的种子，又名草决明、假绿豆、还瞳子等。功能清热明目，益肾补精，润肠通便。决明子作为药用，历史 悠久，成书于秦汉时期的《神农本草经》把它列为上品，认为“久服益精，轻身”。明代李时珍《本草纲目》谓其“妆如马蹄，青绿色……益 Cassia is a dry, mature seed of Cassia obtusifolia or Cassia obtusifolia, also known as Cassia, pseudo-mung bean, and also omija. The function is to clear away heat and improve eyesight. As a medicinal herb, cassia seed has a long history. It was listed as a top grade in the Shennongbirth Classics of the Qin and Han Dynasties. It was considered that “long-serving, good-natured, and light-weight”. The Ming Dynasty Li Shizhen’s “Compendium of Materia Medica,” said that its "makeup is like a horse’s hoof, greenish blue... benefits.