[Dove]

Some products list the mg but fail to list the carvacrol percentage. The highest I found that can be bought is 85%, but, please note, this must be diluted usually with olive oil. You can not injest it at 85%. If a brand says it contains Olive oil it has already been diluted.

Puritan's Pride (I shop there also) has it but, most of their products are not standardized which means the proportions are not always the same. Their oregano oil does not list the carvacrol content so you do not really know how much you are getting.

Natures Way offers the oil in capsule form, no mixing. I have tried 3 different kinds and now keep two that proved beneficial. One is the pure with 85% carvacrol which I dilute myself with olive oil.

"Look for standardized herbal supplements. The U.S. Pharmacopeia's "USP Dietary Supplement Verified" seal on a supplement indicates the supplement has met certain manufacturing standards.
These standards include testing the product for uniformity, cleanliness and freedom from environmental contaminants, such as lead, mercury or drugs."

Here is an example of a label that tells you:

"Standardized to a Carvarcol content of 69% without artificial additives - which makes it the most naturally potent available. Higher amounts would require artificial boosting - thus claims of natural Carvarcol above 69% are misleading."