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Adaptogen for Physical & Mental StaminaHerbal SupplementApproved by Michael Tierra L.Ac O.M.DFull Spectrum™ Rhodiola Rosea is an extract standardized to 0.8% salidrosides and 0.8% rosavins two known active constituents. Rhodiola rosea is a legendary adaptogenic tonifier that comes from the polar arctic regions of eastern Siberia. Among traditional people there it is highly valued as a strengthening tonic to increase physical and mental stamina.