Oregano

Oregano is the dried leaf of plants in the mint family, primarily Origanum vulgare. It originates from the Mediterranean region and is a staple in Italian, Greek, and Mexican cuisines. Fresh and dried oregano are used to season soups, sauces, meats, vegetables, and prepared foods. Dried oregano is more concentrated in flavor and bioactive compounds than fresh.

Per 100 g, dried oregano contains approximately 265 calories, 9 g protein, and significant amounts of iron, manganese, and calcium. The herb is rich in phenolic compounds, including carvacrol and thymol, which exhibit antimicrobial and antioxidant activity in laboratory settings. Typical culinary portions (1–2 teaspoons dried oregano) deliver negligible calories and macronutrients but detectable concentrations of these compounds. Oregano does not significantly affect digestion or gut motility at normal intake levels.

Antioxidant and Antimicrobial Properties

Oregano contains a high total phenolic concentration relative to many common herbs and spices. In controlled laboratory and animal studies, carvacrol and thymol demonstrate antimicrobial and antioxidant activity. Human evidence remains limited; clinical relevance of culinary doses is unclear. Oregano is not a medicinal substitute for antibiotics or disease treatment.

Safety and Usage

Oregano is recognized as generally recognized as safe (GRAS) by the FDA for food use (21 CFR 182.10). No established tolerable upper intake level exists. Allergic reactions to oregano are uncommon but possible in individuals sensitive to plants in the mint family (Lamiaceae). Pregnant women should use oregano only in typical culinary amounts, as high-dose extracts lack adequate safety data. No significant herb-drug interactions are documented at standard food consumption levels. Essential oregano oil is distinct from dried culinary herb and should not be ingested without medical supervision.