What Is Rehmannia Root Extract Rehmannia root extract comes from a flowering plant that is native to China. It has been used for thousands of years in China for its purported health benefits. While different parts of the plant can be used, this extract comes from the rehmannia root, specifically. Rehmannia Root Extract Benefits Rehmannia root extract has a wide range of purported health benefits ranging from supporting urinary health to promoting healthy brain function.* It may help aid metabolic function and sexual wellness, support the bones, and promote healthy skin and hair.* In addition, it may help support cardiovascular health, liver health, and prostate health.* Rehmannia root extract may also have natural anti-inflammatory properties.*