Health Concerns Rehmannia 8 90 count Rehmannia 8, also known as Jin Gui Shen Qi Wan, is beneficial for a number of conditions, including aging, glaucoma, and forgetfulness . What it is best for: Chinese Therapeutic Effects: Tonifies kidney qi and yang Warms the center Benefits the back Drains dampness Western Symptoms Rehmannia 8 can be used for the following symptoms: Low back pain Ear-Ringing - Kidney deficiency Blurry Vision Back, Weak - Kidney yin deficiency Prostate conditions Water retention Supports normal erectile function General fatigue Forgetfulness Why it works: Rehmannia 8 is based on the traditional formula Jin Gui Shen Qi Wan used to tonify the kidney qi and yang. Eucommia (du zhong) replaces aconite (fu zi) in this formula to make it less warming and to add a strengthening effect for the tendons, ligaments, and bones. Rehmannia (shu di huang) nourishes the blood and replenishes the kidney. Poria (fu ling) tonifies the spleen and stomach and pacifies the heart.