Senna is one of the more popular choices for herbal laxative, and is very effective in tea form. In most people, it gently promotes regularity, however, some people are more sensitive to senna, so use caution when first trying it. Be sure to prepare it exactly as suggested, and do not over-steep or boil it so that you don’t concentrate the active constituents. Be aware too, that many dieter’s teas are really just senna tea, often with a flavoring added, but with no other benefit to dieters than staying “cleaned out.”