Hyssop Leaves, Hyssopus officinalus
This is an ancient remedy that's still wonderful today. "Purge me with hyssop," the Bible records, "and I will be clean." Hyssop has been used for millennia as a holy herb, consecrated for cleaning holy places. Its name comes from the Hebrew word adobe or ezob, which literally means "holy herb".
Traditionally used in teas, however it may be equally effective as a capsule or extract.