Rhodiola is authentic Russian Rhodiola rosea, an herb with a long traditional use in Siberia for adaptation to the rigors of life on the tundras of North-central Asia. Rhodiola is a powerful adaptogen backed by extensive animal studies and several controlled human trials. Users report that Rhodiola is especially well suited to persons who typically respond to stress with anger or anxiousness. Rhodiola also provides support for healthy cell-mediated immune response.