Herbalist | Chinese Herbal Medicine

Bai Zhu, the rhizome of Atractylodes macrocephala (white atractylodes), is the foremost herb for strengthening the Spleen and drying Dampness in TCM. Bitter and sweet in flavour, warm in temperature, it enters the Spleen and Stomach meridians. Bai Zhu is so fundamental to Spleen-strengthening formulas that it appears in an extraordinary number of classical prescriptions — it is one of the four herbs in Si Jun Zi Tang (Four Gentlemen Decoction), the base formula for Qi deficiency.

Bai Zhu has three primary actions: tonifying Spleen Qi and drying Dampness (for fatigue, poor appetite, loose stools, and abdominal distension), stabilising the exterior and stopping sweating (for spontaneous sweating from Qi deficiency), and calming the foetus (traditionally used for restless foetus syndrome when Spleen Qi deficiency is the underlying cause). Its ability to both tonify the Spleen and dry Dampness makes it uniquely valuable — many tonifying herbs are moistening and can worsen Dampness, but Bai Zhu addresses both the root cause (Spleen weakness) and the consequence (Dampness accumulation) simultaneously.

Bai Zhu should be distinguished from Cang Zhu (Atractylodes lancea), a related herb that is more drying and dispersing but less tonifying. Bai Zhu is preferred when the primary goal is strengthening the Spleen, while Cang Zhu is better for strongly drying Dampness when tonification is secondary. Standard dosage is 6 to 15 grams in decoction. Processing methods affect its action: dry-fried Bai Zhu is milder on the Stomach, while earth-fried Bai Zhu has enhanced Spleen-tonifying properties.