You Gui Wan is a classical formula that is designed for Kidney yang deficiency and ming men fire deficiency; deficiency Cold of spleen and stomach; kidney Qi and Yang deficiency. Marked by fatigue, exhaustion from long-term illness, low energy, aversion to cold, coolness of the extremities, aching and weakness of the lower back and knees, low sexual energy. Also look for a pale tongue, and deep, slow, weak pulse. Treasure of the East® herbal formulas are full-spectrum, pharmaceutical-grade, and extracted with only purified water to replicate a traditional decoction. They are produced by Tianjiang Pharmaceutical, the world's largest producer of herbal granules, in a facility that is fully automated and computer-controlled to ensure quality and consistency. Products are tested extensively in Tianjiang's CNAS National Laboratory, yielding high-precision data regarding each herb's identity, origin, the concentration of effective components, heavy metals, pesticide residues, and proper dosage in concentrated form. Tianjiang's production protocols for concentrated herbal extracts have been internationally recognized and adopted into the pharmaceutical and food standards of the China Food and Drug Administration.