Licorice root (甘草): deep roots and restrained harvesting

The material and its source

Licorice root comes from Glycyrrhiza uralensis Fisch. (the species shown; standards may also recognize other Glycyrrhiza species), in the Fabaceae family. The medicinal material is the dried root and rhizome.

Gan Cao is a hardy legume adapted to dry grassland and desert margins. Its deep roots reach moisture below the surface and help stabilize fragile soil.

Harvest

Roots are dug in autumn after several years of growth. Restrained collection selects mature roots while leaving smaller plants and underground growth so the population can recover.

Processing

Soil and small side roots are removed before the roots are cut and dried. Some traditional preparations are honey-fried, but the raw dried root remains a separate material.

Traditional uses and symptom patterns

Gan Cao appears in many formulas for cough, throat discomfort, spasms, and digestive patterns and is also used to coordinate the actions of other ingredients. Frequent inclusion does not mean unlimited dosing is safe.

What modern research has examined

Glycyrrhizin and other licorice compounds have pharmacological activity, but whole-root products, deglycyrrhizinated products, extracts, and confectionery licorice are not equivalent. Clinical findings from one preparation cannot be transferred automatically to another.

Safety and interactions

Chronic glycyrrhizin exposure can raise blood pressure, lower potassium, suppress renin and aldosterone, and disturb heart rhythm. Risks and interactions are especially important with diuretics, corticosteroids, digoxin, and heart, kidney, or blood-pressure conditions; pregnancy also requires caution.