Oregano is also known as wild marjoram.
It was actually an exclusive medicinal herb, but nowadays it is mainly used as a kitchen herb.
A strong tea was made from the leaves, which was drunk as a cough medicine. It also turned out to be a laxative, so birds can have a reaction to this too
It stimulates digestion in general and reduces nausea.
In Mexico, research has been conducted into oregano as a medicine against infection with the parasite Giardia lamblia. This showed that oregano was more effective  than the commonly prescribed drug.
This herb is full of phytonutrients. It contains thymol, an acid that also occurs in thyme and rosmarinic acid, which is of course also in rosemary . These are both substances with an antiseptic effect. It attacks harmful bacteria and free radicals. This makes oregano a real boost for the immune system.
Its former status as a medicine is fully confirmed by science.

Oregano is an excellent herb to make an herbal oil. You just let the oregano steep in a bottle olive oil

Can be used for consumer quality for at least 1 year if kept cool and dry