Oregano is an herb that is commonly used in cooking. It can be used fresh or dried, and has a strong, aromatic flavor. Oregano is a member of the mint family and is native to the Mediterranean region.
The main active ingredient in oregano is carvacrol, which has antibacterial, antifungal, and antioxidant properties. Carvacrol can inhibit the growth of harmful bacteria such as E. coli and Salmonella (1).
Oregano also contains thymol, another compound with antimicrobial activity. Thymol can help fight off infections by destroying bacterial cells (2).
In addition to its antimicrobial properties, oregano also contains antioxidants that can protect your cells from damage caused by free radicals (3). Free radicals are unstable molecules that can cause cellular damage and contribute to disease development (4).
Oregano oil has been shown to kill cancer cells in vitro (in a lab dish), although more research is needed to determine if it has any anticancer effects in humans (5).
While oregano is generally safe when consumed in small amounts, there are a few potential side effects to be aware of. consuming large amounts of oregano may lead to an upset stomach or heartburn because of its high acidity level (6). If you experience these side effects after consuming oregano, try drinking milk or taking an antacid medication such as Tums. You should also avoid using oregano essential oil if you have GERD or are pregnant since it may aggravate these conditions (7).
Overall, oregano is a healthy herb with many benefits. However, like most things, it should be consumed in moderation to avoid any adverse effects.