1 Part Red Clover Blossoms
1 Part Burdock Root
1 Part Dandelion Root
1 Part Echinacea (Optional)
Red clover blossoms and burdock root are the strongest of all blood purifiers; dandelion root stimulates bile flow. Echinacea is an immune-system stimulant, but should only be used for short periods (intensely) before taking a break. If you are concerned about bowel regularity then you could add one part cascara sagrada to the blend, or perhaps senna if you are not adverse to this herb.
* Sarsaparilla is also an excellent blood purifier, as is yellow dock root.
Experimenting with herbs is incredibly enjoyable...have fun!