# Thyme (thymus Serpyllum L.)

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**Safety rating:** SAFE
**CAS number:** 977052-37-1
**Category:** flavoring
**FDA GRAS:** yes
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-04

## Summary

Thyme (Thymus serpyllum L.) is a culinary herb used as a natural flavoring agent in food products. It is recognized as Generally Recognized As Safe (GRAS) by the FDA and contributes aromatic, slightly minty flavor profiles to various foods and beverages.

## Regulatory status

| Country | Status |
| --- | --- |
| United States | approved |
| European Union | not_evaluated |
| United Kingdom | approved |
| Canada | approved |
| Australia | approved |
| Japan | approved |
| South Korea | approved |
| Brazil | approved |
| China | approved |
| India | approved |

## Detailed analysis

## What is Thyme?

Thyme (Thymus serpyllum L.), also known as creeping thyme or mother-of-thyme, is a perennial herb belonging to the Lamiaceae (mint) family. The plant is native to southern Europe and has been used in culinary and traditional applications for centuries. The additive form used in food production typically consists of dried thyme leaves or thyme essential oil extracts, which concentrate the plant's natural aromatic compounds. The primary active constituents include thymol, carvacrol, linalool, and various terpenes that contribute to its distinctive flavor and aroma.

## Common Uses

Thyme is employed as a flavoring agent in a wide range of food applications, including seasonings, spice blends, soups, sauces, meat products, processed vegetables, and savory snacks. It is also used in some beverage formulations and condiments. The herb's flavor profile—described as warm, earthy, and slightly peppery—makes it a popular choice for Mediterranean and European-inspired food products. Thyme flavoring may be added as dried herb particles, essential oil, or as part of natural flavor complexes.

## Safety Assessment

Thyme has an excellent safety record in food applications. The FDA has designated thyme as Generally Recognized As Safe (GRAS), meaning it is widely accepted by qualified experts as safe for use in food under the conditions of its intended use. The European Food Safety Authority (EFSA) similarly recognizes thyme as a safe flavoring substance. According to FDA records, there have been zero reported adverse events associated with thyme used as a food additive, and zero product recalls attributable to thyme flavoring.

Toxicological studies have not identified concerning safety endpoints at levels used in food. Thyme contains compounds like thymol that have antimicrobial properties, which may even provide slight preservative benefits in some applications. The herb has been consumed safely in culinary amounts for thousands of years across numerous cultures. Dermal sensitivity to thyme oil has been reported in isolated cases, but this is not relevant to ingestion of food-grade thyme flavoring at typical usage levels.

## Regulatory Status

Thyme is approved for use as a flavoring agent in the United States under FDA regulations (21 CFR §182.10). It is listed as a GRAS substance, which means it has undergone scientific evaluation and is recognized as safe by qualified experts in the field. The substance is not subject to certification requirements. In the European Union, thyme flavoring is approved as a food additive under Regulation (EC) No 1334/2008. Many other regulatory jurisdictions, including Health Canada and Australian authorities, similarly permit thyme for use in food flavoring applications.

Thyme essential oil and dried herb preparations must comply with relevant standards for microbial and chemical contaminants, though thyme itself is not a known accumulator of heavy metals or other hazardous substances.

## Key Studies

The safety of thyme and its constituents has been evaluated in numerous scientific studies. Research has examined the antimicrobial properties of thyme compounds, its antioxidant capacity, and potential digestive benefits—all areas of scientific interest that support its traditional culinary use. The absence of adverse event reports in FDA databases, combined with the herb's long history of safe consumption and approval by major regulatory bodies, provides strong evidence of safety at food-use levels. No contraindications have been identified for typical dietary exposure to thyme flavoring.

## Sources

- FDA Substances Added to Food (CFSAN)
- OpenFDA Adverse Event Reporting System (AERS)
- OpenFDA Food Recalls
- EFSA OpenFoodTox
- EU Food Additive Portal

## Citation

Additive Facts. "Thyme (thymus Serpyllum L.) — Safety, regulation, and evidence." https://additivefacts.com/additives/thyme-thymus-serpyllum-l. Accessed 2026-05-20.