Zhi Gan Cao Tang also known as Fumai Tang

Zhi Gan Cao Tang (also known as Fumai Tang)

Ginseng 2 qian, Rehmannia 2 liang and 6 qian, Ophiopogon 8 qian, Donkey-hide Gelatin 2 qian, Sesame 5 qian, Roasted Licorice 4 qian, Jujubes 3 pieces, Cinnamon Twig 3 qian, Fresh Ginger 3 qian, Clear Wine (1) 1 liang

This formula is a major tonic for replenishing blood. Senior scholar Yang Xishan once said that this formula should never be altered, yet he did not explain why. In my view, this formula reflects the principle that the middle jiao receives qi and extracts essence, which then transforms into blood. Ginger, jujubes, ginseng, and licorice extract essence from the middle jiao, while cinnamon twig enters the heart to transform qi into blood. However, cinnamon's pungent nature can harm blood, so Rehmannia, Ophiopogon, and sesame are added to moisten and soften it, turning cinnamon's fierce energy into something gentle, thus producing blood without harming it. Additionally, donkey-hide gelatin helps to stabilize the blood, channeling it into the blood sea and storing it in the liver. Overall, this formula addresses the source of blood, guides its flow, and truly serves as the premier remedy for blood replenishment—alterations should never be made lightly. The subsequent Yangrong Tang also derives from this formula. While Yangrong Tang is milder, this formula uses more Rehmannia and Ophiopogon, making it a more moderate tonic specifically designed to generate blood. If promoting lactation, cinnamon twig is unnecessary. If omitting cinnamon and adding jujube seeds and polygala, the formula becomes even less pungent. Adding danpi and peach kernels can help cool the heart and transform blood. Adding gardenia can also cool the heart and purify the blood. Adding schisandra can consolidate lung metal. Although modifications are possible, they still uphold Zhang Zhongjing's original intent—so why not?

[Note] (1) Clear wine: Refers to rice vinegar

[Note] This formula originates from "Shanghan Lun." It is the primary tonic for replenishing blood. Adhering to the principle that "the middle jiao receives qi and extracts essence, which then transforms into blood," this formula heavily relies on ginseng, licorice, ginger, and jujubes to tonify the middle jiao, while cinnamon twig channels heart yang, and Ophiopogon and Rehmannia nourish heart yin, collectively achieving the goal of replenishing and generating blood.