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Botanical Support For The Overworked 637 mgHerbal SupplementFormulated by Michael Tierra L.Ac O.M.DPlanetary Herbals Rehmannia Endurance™ is based on the classic Chinese tonifier Rehmannia Six: Liu Wei Di Huang Wan one of the most strengthening tonics of Chinese herbalism. Traditionally it was used for those who are tired and run down from overwork and inadequate rest due to a fast-paced lifestyle.