Zhi Bai Di Huang Wan by Blue Poppy’s Great Nature Classics is a formula that comes from Qin Jing-mings Qing dynasty Zheng Yin Mai Zhi (Patterns, Causes, Pulses & Treatments).
Within this formula, Shu Di (cooked Radix Rehmanniae) is the sovereign ingredient. It enriches kidney yin, boosts the essence, and fills the marrow.