Natural Senna Tea Bagged Senna tea is derived from the leaves of Cassia plants, which comprise more than 250 different species. Senna has been traditionally used as a laxative as well as to clear the bowels before tests such as colonoscopy. The senna plants are small shrubs that bear yellow or green leaflets; these can be cultivated and dried to make senna tea.
While a number of studies have tested the effects of senna in powder or capsule form, very few studies have looked at the potential health benefits of drinking senna tea. Senna typically starts working within 6 to 12 hours after taking it. It is often taken prior to going to bed, creating the urge to defecate the next morning.