On Dang Gui and the smell across the room

A short note on the herb that carries the weight of nearly every women's formula in the tradition.

What's visible.

On the left: our Dang Gui, from Min County in Gansu — the ground the classics name as the source. Look at the tail. It is intact, thick, and gives off a sweet, medicinal scent you can smell across the room. The flesh, cut open, is yellowish-white and oily to the touch. The root is three years old.

On the right: market Dang Gui, thinner and darker. The tail is missing or fragmented. The aroma is faint. The flesh has dried past the point where the essential oils remain.

Why this changes the prescription.

Dang Gui's action lives in its volatile oils and ferulic acid — both concentrated in the tail (归尾, gui wei) and body (归身, gui shen), and both degrading quickly in poorly-stored or over-aged material. Traditional grading seperates the herb into three parts: the head (归头) tonifies blood, the body nourishes it, the tail moves it. A formula written for whole Dang Gui and filled with tail-less, oil-depleted material is not the formula the text described.

The clinical trials that shaped modern Dang Gui prescription assumed the intact, oily, three-year root. When a case does not lift the way the text promised, the tradition is not what failed. The material on the shelf was.

The formula it lives in.

Copeia is Dang Gui Shao Yao San — Zhang Zhongjing's formula from the Jin Gui Yao Lue, built for the woman whose blood does not quite reach her extremities, whose cycle is dark and clotted, whose belly holds a persistent, low ache. The formula pairs Dang Gui with Bai Shao and Chuan Xiong to move and nourish blood, and with Bai Zhu, Fu Ling, and Ze Xie to lift the damp that always shadows blood deficiency in the lower jiao.

It is in our Copeia — with Sha Ren added to keep the blood herbs from cloying the stomach.

With respect,
Dr. Lan
Your Herbal Pharmacist

Copeia
Dang Gui Shao Yao San with Sha Ren — built on this Dang Gui.
View Copeia →