Chinese Chive Seed Classic Formulas … Natural Herb Library

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Warms and tonifies Liver-Kidney Yang while securing essence ... Jiu Cai Zi is chosen when weakness of the lower burner leads to impotence, reduced libido, nocturnal emission, infertility, and soreness of the low back or knees.
Secures the lower gate and helps the Bladder contain fluids ... it is used for frequent urination, enuresis, urinary dribbling, or clear profuse discharge when Kidney Qi and Yang are too weak to hold.
Assists chronic deficiency cold in the lower burner ... traditional use extends to long-standing weakness with leakage symptoms rather than to acute heat or inflammatory presentations.

Zan Yu Dan ... a major Kidney-Yang and fertility formula in which Jiu Cai Zi helps warm the lower burner while securing essence.
Kidney-warming leakage formulas with Sang Piao Xiao or Bu Gu Zhi ... practical traditional strategy for frequent urination and seminal leakage.
Small seminal-emission and lower-gate formulas centered on warming and securing ... a classic niche of the seed beyond general aphrodisiac marketing.

Traditional herbology records Jiu Cai Zi as sweet, acrid, and warm, entering the Liver and Kidney to tonify Yang, warm the waist and knees, and secure essence.
Its classical identity is more about warming and retaining than about aggressively restoring collapse-level Yang deficiency.