It depends if you have over 85% carvacol (the active ingredient,) of wild Mexican oregano oil (the effective one) then the best way to use it for respiratory and congestion is to start with 3 drops in a big bowl of steaming, hot water. Put a towel over your head and the bowl. You want to have tissues close at hand. Breathe it in. It will sting (maybe a LOT) and that would be the virus, bacteria or fungus dying. Once you become tolerant, you can increase the number of drops.

It will be active for only about 5 minutes, so you'll have to add more drops. Do this as many times a day as you'd like, for as long as you like. Doing ooo therapy for about 4 weeks will rid you of allergies, asthma and chronic bronchitis, etc., even if you've had them for years.

For topical use, you want to use one to twelve ratios of ooo to organic olive oil (i.e., 1 drop to twelve drops.) This is for cuts and skin issues. Or, use drops under the tongue, for digestive and intestinal problems.

Breathing it in delivers the oregano oil directly into the blood stream.