Licorice Root TCM

Licorice root's primary active compound, glycyrrhizin, inhibits the enzyme 11-beta-hydroxysteroid dehydrogenase, which converts cortisol to cortisone. This leads to increased cortisol levels, producing anti-inflammatory and mineralocorticoid effects. The herb also contains flavonoids like liquiritin and glabridin that contribute antioxidant and spasmolytic properties. In TCM theory, licorice tonifies spleen qi and harmonizes other herbs in formulas. Evidence Level: B.

Licorice root interacts with several medication classes. It may potentiate corticosteroids and diuretics, increasing hypokalemia risk. It can reduce effectiveness of antihypertensive medications by raising blood pressure. Licorice also interacts with digoxin, warfarin, and oral contraceptives. Avoid combining with potassium-wasting diuretics, MAO inhibitors, or blood pressure medications. Consult a healthcare provider before use if taking prescription medications. Evidence Level: B.

Traditional TCM dosages range from 3-12 grams of dried root in decoction form daily. For deglycyrrhizinated licorice (DGL) extract, typical doses are 200-500mg daily for digestive support. Whole licorice should not be used long-term at high doses due to pseudoaldosteronism risk. DGL preparations are safer for extended use as they contain minimal glycyrrhizin. Always follow product labeling or consult a qualified practitioner. Evidence Level: B.

Licorice root is considered unsafe during pregnancy. Research suggests that consuming large amounts of licorice during pregnancy may be associated with preterm birth, lower birth weight, and potential effects on fetal brain development. Glycyrrhizin can cross the placenta and affect fetal development. Pregnant women should avoid licorice supplements and limit consumption of licorice-containing foods. Evidence Level: B.

Long-term or high-dose licorice consumption can cause pseudoaldosteronism, characterized by hypokalemia (low potassium), elevated blood pressure, and edema (fluid retention). Other side effects include headache, fatigue, and muscle weakness. These effects are primarily due to glycyrrhizin content. People with hypertension, kidney disease, heart failure, or existing edema should avoid licorice root. DGL extracts have minimal glycyrrhizin and lower side effect risk. Evidence Level: B.