The results are worth the cost/smell/taste/burning.
I HIGHLY recommend taking this internally. I've used it topically before, and it works pretty well, but the results from taking it internally are amazing!
I fill a shot glass with about 1 third honey (to mask the taste) with 2 thirds water, add 5 drops of oil of oregano and drink it. It burns a little going down, so I chase it with a glass of water. The taste is bearable, and absolutely worth it. I drink this mixture once when I wake up, once before bed, and at lunch if I remember.
I've been doing this for a week and my skin looks better than it has in years. Most of my active acne is gone, and my hyperpigmentation is looking better as well.
I plan to reduce the amount I'm taking as my acne improves. The recommended dosage on the bottle was 3-5 drops, 3 times a day for infection fighting, 1-2 drops 2 times a day for general health maintenance.
I also use it topically. I wash my face using the Tumeric and Neem face wash from Himalaya then I soak a cotton ball in water, squeeze out the excess so it's damp but not dripping, then put three or four drops of oil of oregano on it and wipe it all over my face. I wait for it to dry, then I soak another cotton ball in salt water (I just mix table salt with water - about 1:3 or 1:4 salt:water, keep stirring till dissolved) and wipe that all over my face, then let it dry. I only do it at night, because the smell of the oregano oil is so strong I worry people will be able to smell it if I go out with it on.
I paid $20.00 for 30ml. Pricey, but worth it!