From the Manufacturer's Label:
Oreganol P73 is the original and truly wild oregano leaf extract, a blend of 4 edible species of high mountain oregano. North American Herb & Spice wild oregano is from the original ancient sources grown upon the white calcium-rich rock found in the pristine Mediterranean mountains, up to 8,000 feet above sea level. Accept no cheap imitations grown merely on dirt as are farm-raised and GMO varieties. North American Herb & Spice wild oregano is from ancient, unglaciated sources, so the rocky soil is exceptionally rich.
Manufactured by North American Herb & Spice.