In 2015, IGFS (Institute for Global Food Securty) at Queens University Belfast in cooperation with the Consumer Organisation Which? conducted a survey of oregano, which found 25% of the samples tested were adulterated. This year, a small follow-up survey was carried out on 20 samples of oregano, and only one sample was found to be adulterated, which clearly shows a huge improvement from the earlier 2015 survey.
In parallel with the survey on oregano, in August and September this year, a snapshot survey of the herb sage was undertaken, and 19 samples bought from major online retailers; all the well-known UK supermarkets; and smaller, independent shops such as ethnic grocery stores. In this survey, just over 25 percent of all the samples tested were adulterated. The level of bulking out of the sage samples with non-food materials such as olive leaves and other tree leaves, ranged from 29% to a staggering 58%. However, none of the brands sold by the big UK supermarket chains was found to be fraudulent, and only some sage sold by online retailers and smaller independents was found to have been adulterated.