Zan Yu Dan is a 14-ingredient Chinese Medicine formula with Prepared Aconite (Zhi Fu Zi), Cinnamon Bark (Rou Gui), Desert-Living Cistanches (Rou Cong Rong), Morinda Roots (Ba Ji Tian), Epimedium Herbs (Yin Yang Huo), Cnidium Seeds (She Chuang Zi), Garlic Chive Seeds (Jiu Cai Zi), Curculigo Rhizomes (Xian Mao), Cornelian Cherries (Shan Zhu Yu) and Eucommia Bark (Du Zhong) as principal ingredients.
Invented in 1624 AD, it belongs to the category of formulas that warm Yang and tonify.
Its main action is that it warms and tonifies the Kidneys.
In Chinese Medicine health conditions are thought to arise due to "disharmonies" in the body as a system. These disharmonies are called "patterns" and the very purpose of herbal formulas is to fight them in order to restore the body's harmony.
From a Western Medicine standpoint, such patterns can give rise to a range of conditions such as erectile dysfunction, infertility in male or infertility in female for instance.