What is the chief herb in Dang Gui Bu Xue Tang?

• A. Shu Di Huang
• B. Bai Zhu
• C. Bai Shao
• D. Huang Qi

Answer: (D)

This formula is designed to tonify qi to support the production and circulation of blood, addressing a pattern where blood deficiency arises from insufficient qi to drive blood formation. The herb that functions as the chief in this combination is the qi-tonifying herb, Huang Qi. Its role as the main driving force is why it is considered the chief: it strengthens and raises the body's qi, providing the vital energy that enables blood production and movement. With stronger qi, the blood-nourishing herbs can work more effectively to nourish and stabilize the blood.

Dang Gui supplies the blood-nourishing effect, helping to replenish and move blood, while the other ingredients support the overall balance (for example, by stabilizing and tonifying the spleen to retain blood or by supporting the blood’s foundation). But the primary direction of the formula—tonifying qi to support blood production—comes from Huang Qi, making it the best answer.

Shu Di Huang is a powerful blood tonic in other contexts, but in this formula the emphasis is on qi support to drive blood, so Huang Qi is the chief. Bai Zhu and Bai Shao play supporting roles—strengthening the spleen to prevent further blood loss and nourishing the blood—but they do not steer the formula as the principal driving herb.