In Si Jun Zi Tang, what is the dosage range for Ren Shen?

• A. 2-6 g
• B. 3-9 g
• C. 1-3 g
• D. 9-12 g

Answer: (B)

Ren Shen acts as the principal qi-tonifying herb in Si Jun Zi Tang, so its dose is kept moderate to lift the patient’s energy while allowing the other herbs to work together to strengthen the spleen and resolve dampness. The standard range for Ren Shen in this formula is three to nine grams per decoction. This amount provides enough qi-boost to support digestion and vitality without overpowering the formula or causing excessive warming or stimulation. If the dose falls below three grams, the tonic effect may be insufficient to address qi deficiency; if it goes above nine grams, it can disrupt the formula’s balance and potentially generate too much heat or restlessness, undermining the harmonizing action of Bai Zhu, Fu Ling, and Gan Cao.