Restore the Yin is an augmented version of the classic Yin Essence tonic, Rehmannia 6. The Kidney is considered the source of all Yin and Yang in the body, and as such, all the Yin organs derive their Essence from the source. The function of the four herbs, Dong quai, Dioscorea, Asparagus, and Peony, added to the formula are to directly tonify the Yin of the Liver, Lungs, Spleen, and Heart, thereby protecting and conserving the source Yin of the Kidneys. In addition, to remain faithful to the inseparability of mutual dependence on Yin and Yang, Eucommia, a Yang tonic, was added to maintain the energetic dynamic of this ancestral pair. 90 Vegetarian Capsules 450 mg per capsule Ideal for: Anyone looking to support healthy heart function. TCM Function: Nourishes Yin Essence, Builds blood. Usage: Take 3 capsules two times per day on an empty stomach with a full glass of water. Extract ratio: 10:1