Polygonum (Root)- Polygonum Multiflorum root is a magical herb that can take an aging person back to youthfulness. This longevity herb, which is also called as Fo Ti, is a typical Yin essence (Jing) tonic used to enhance energy and clean the blood. If consumed regularly, it serves as a powerful sexual tonic that is also believed to improve sperm production in men and enhance fertility in women. As per Chinese medicine, it can be used in all such tonics that are believed to nurture the teeth and hair. Polygonum is good for the kidney and liver functions too and thus important for general well being. It can prevent premature aging by fortifying the tendons, ligaments and bones. Its reputation for turning gray hair into black has made it extremely popular throughout Asia.