Oregano | whatsinit

About

What it is and where it shows up.

Oregano (Origanum vulgare L.) is a perennial herb in the Lamiaceae family widely used as a culinary spice and natural flavouring agent in Mediterranean and global cuisines. Its primary bioactive compounds—carvacrol and thymol—also confer antimicrobial and antioxidant properties, making it of interest as a natural food preservative.

Safety summary

The regulatory and scientific consensus.

At culinary and dietary intake levels, oregano is broadly recognized as safe with no formal ADI established for the dried herb. EFSA (2010) noted that while oregano extracts are generally recognized as safe, concentrated extracts lack adequate genotoxicity, reproductive, and long-term toxicity data, making their safety indeterminate at high doses. At supplement-level doses, caution is warranted for pregnant individuals and those on anticoagulant medications.

Regulatory landscape

What food-safety regulators have decided.

Jurisdiction	Status	Note
EFSA (European Food Safety Authority) (European Union)	Approved	Permitted as a flavouring preparation under Regulation (EC) No 1334/2008 without individual pre-market evaluation, provided it poses no safety risk and does not mislead the consumer. No specific E-number is assigned to the whole herb. EFSA (2010) noted insufficient data to fully assess safety of concentrated oregano extracts at high doses.source
FSSAI (Food Safety and Standards Authority of India) (India)	Approved	FSSAI issued draft standards for dried oregano (whole and powder) under the Food Safety and Standards (Food Products Standards and Food Additives) Amendment Regulation, 2018 (draft uploaded 06.07.2018). Oregano is also recognized as a traded spice in FSSAI's Guidance Document for Spice Processing (2018). Final adoption date of the product standard is not confirmed in publicly available records.source
FDA (Food and Drug Administration) (United States)	Approved	Listed as GRAS under 21 CFR 182.10 (Spices and other natural seasonings and flavorings). No maximum use level specified; used at GMP (Good Manufacturing Practice) levels as a culinary spice and flavouring.source

Who should approach with care

Whose guidance would steer them away.

Pregnancy — High-dose oregano supplements and concentrated extracts have historically been associated with uterine-stimulating effects; culinary amounts in food are considered safe, but medicinal or supplement doses should be avoided during pregnancy.

Other — Individuals on anticoagulant medications (e.g., warfarin) should exercise caution, as oregano is a source of vitamin K and its concentrated extracts may have additive blood-thinning properties that can alter anticoagulant drug efficacy; consult a healthcare provider regarding high-dose use.

Other — People with documented allergies to other plants in the Lamiaceae (mint) family—such as basil, sage, thyme, or lavender—may experience cross-reactive allergic responses to oregano and should consult a doctor before consumption.

Research citations

The sources behind this verdict.

1FDA. Code of Federal Regulations Title 21, Part 182.10 — Spices and other natural seasonings and flavorings (GRAS). accessdata.fda.gov
2PubMed. Chemical Composition, Biological Activity, and Potential Uses of Oregano (Origanum vulgare L.) and Oregano Essential Oil, 2025. pmc.ncbi.nlm.nih.gov
3EFSA. Safety and efficacy of an essential oil from Origanum vulgare ssp. hirtum (Link) Ietsw. for all animal species, 2019. efsa.europa.eu
4FSSAI. Guidance Document: Food Safety Management System (FSMS) for Spice Processing, 2018. fssai.gov.in
5EFSA. Scientific Opinion on the use of oregano and lemon balm extracts as a food additive, 2010. efsa.onlinelibrary.wiley.com

Independently researched5 citations