Senna The fruit is a pod, thin, flat, slightly bent. Similar to green peas, but more fortified and flatter than oblong. The young fruit is green, but when mature, it turns brown. Inside the fruit, there are about 6 -12 seeds. It is a Thai herb that has been used to relieve constipation for a long time by boiling dried leaves or dried pods to eat. It is available both as a standalone herb and in combination with other herbs. In addition, senna has been developed to be registered as a modern drug.