This is a modern formulation that is based on traditional principles as well as modern research. According to traditional theory, loss of reproductive functioning is due to deficiency of the Kidney Essence, and generally deficiency of the Yang aspect predominates. The major part of the formula nourishes the Kidney Essence and warm-tonify the Kidney Yang. In addition, there are herbs that may tonify the Qi and nourish the Blood. The herbs in the formula may support the replenishment of the Kidney Essence and may ensure the smooth and even movement of the Qi and Blood throughout the body as well as providing an additional substrate for the Kidney Essence.