Thyme & Liquorice – Traditional Use & Research

Botanical Overview

Thyme (Thymus vulgaris) and liquorice (Glycyrrhiza glabra) are two of the most widely documented herbs in European and Middle Eastern herbal traditions. Both plants have been valued for centuries and are frequently combined in preparations intended to support the respiratory system and throat comfort.

Traditionally Reported Benefits

In traditional European herbal medicine, thyme (Thymus vulgaris) combined with liquorice (Glycyrrhiza glabra) has been widely used for conditions involving the respiratory system, coughs and throat irritation. Historical herbal texts describe this combination as strengthening, soothing and cleansing to the lungs and airways.

Traditional practitioners reported the use of thyme and liquorice preparations for a range of respiratory conditions, including:

coughs and chest congestion
bronchial irritation
sore throats and hoarseness
respiratory infections

This combination was commonly prescribed to:

loosen and expel mucus
soothe irritated airways
support comfortable breathing

Thyme was traditionally valued for its role in respiratory health. Herbal sources describe its use where congestion, infection or shortness of breath were present, and it was believed to:

cleanse the lungs
discourage infection
support expectoration

Liquorice was traditionally included for its soothing and harmonising properties. Preparations containing liquorice were used to:

calm inflamed mucous membranes
ease coughing
support recovery from respiratory irritation

The syrup form was particularly valued in traditional practice. Herbalists preferred syrups where:

coughs were dry, irritating or persistent
the throat was inflamed or sore
a gentle, palatable preparation was required

Traditional sources also reference this combination in cases of:

whooping cough
chronic bronchial weakness
respiratory discomfort following illness

Historically, thyme was regarded as a strengthening herb for the lungs. Culpeper described thyme as a “notable strengthener of the lungs,” while Roman physicians burned thyme to cleanse the air. Liquorice was widely used across Europe, the Middle East and Asia for respiratory and throat complaints, valued for its soothing action.

By the 18th and 19th centuries, thyme and liquorice syrups had become common household remedies across Europe, particularly for winter coughs and respiratory discomfort.

These reported benefits reflect centuries of traditional medical use and historical practice

Traditional Use in Respiratory Practice

In traditional European herbal medicine, thyme has long been associated with the lungs and chest. Classical herbal texts describe thyme as a warming, penetrating herb traditionally selected during times of congestion, cough and respiratory discomfort.

Liquorice root has an equally long history of use and was traditionally valued for its soothing and harmonising qualities. In herbal formulas, liquorice was often included to moderate stronger herbs, support mucous membranes and improve both taste and tolerability.

Together, thyme and liquorice formed the basis of many classic syrups, lozenges and decoctions used historically during seasonal respiratory challenges.

Historical Context

The 17th-century herbalist Nicholas Culpeper described thyme as “a noble strengthener of the lungs”, reflecting its long-standing reputation in herbal practice. Roman and Greek sources also reference thyme for its aromatic and cleansing associations.

Liquorice has been used medicinally for over 2,000 years, appearing in ancient Egyptian, Greek, Chinese and Middle Eastern medical texts. It was traditionally used to soothe the throat and chest and to support endurance during periods of stress or illness.

Scientific & Clinical Interest

Modern research into thyme has focused on its aromatic constituents, particularly thymol and carvacrol. These compounds have been widely studied for their interaction with respiratory tissues and microbial environments.

Thyme is recognised in European herbal monographs. In Germany, thyme preparations have been evaluated by Commission E, and the Herbal Medicinal Products Committee (HMPC) has acknowledged thyme’s long-standing traditional use in preparations intended to support productive coughs associated with colds.

Liquorice root has been extensively studied for its bioactive compounds, including glycyrrhizin and flavonoids. Research has explored liquorice’s role in soothing mucous membranes and its traditional inclusion in respiratory and digestive preparations.

The combination of thyme and liquorice continues to attract scientific interest, reflecting its long history of traditional use and its presence in both historical and modern herbal formulations.

Summary

Thyme & Liquorice Syrup reflects a classic herbal partnership with deep historical roots and ongoing scientific interest. Traditionally valued for respiratory comfort and throat soothing, this combination continues to be used in herbal practice as part of seasonal wellbeing routines.