Yes
No, the oregano that we eat is derived from the Origanum Marjoram plant. The medicinal Oregano Oil is derived from the Origanum Vulgare plant. Unfortunately, some people don't realize this and they produce oil of oregano from the Marjoram plant. Watch out for "homemade" oils. So, when you go to buy your Oregano oil make sure it is derived from the Origanum Vulgare plant. And make sure it's percentage of Carvacrol is at least 60%.
It can be, but you can eat it as well and has a mild, oregano-like flavor.
I have never heard oregano would have any impact on birth control pills and we eat it all the time.
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organo cannot repel any of the animals, exept the highest level of animal called human. if your a human and i gave you a perfume made of oregano, you will use it?dont you? its a philosopical answer about it.
Animals that eat both plants and animals are called omnivores.
The difference between oil of oregano and oregano oil is nothing! One can use both types and the terms are interchangeable. Oregano oil or oil of oregano are great additions to cooking.