Darken greys, fight hair loss, and get the best hair of your life with our Crowning Glory Hair Tonic, now a double extract for even more potency! This hair tonic formula is based on Traditional Chinese Medicine principles of nourishing blood and essence (Jing) to support hair growth. He shou wu is traditionally known for its capacity to restore vital essence and even darken prematurely graying hair. Therefore, it is the guiding herb for this formula. Shan yao, or Chinese yam, is a traditional Qi tonic and used in this formula to strengthen digestion as well as support the action of tonifying Kidney Yin. It also has a mild astringent effect which supports maintaining essence (Jing).