I don't think this is news to anyone. I also do not think this is the first time its been claimed. This is probably a global practice, and if a company does not test its source product then it might not be the manufacturers of the final product that are to blame.
They are not alone either. Extra virgin olive oil is from the first pressing of the olive. More is sold in the world than can possibly be made. A number of brands were tested here in Australia some years back, and they varied in olive oil content, could be rancid, or not extra virgin, or could even be canola oil in various blends.
One of the most dubious herbs may be ginseng. I can have a positive response, no response or feel unwell after taking it. The only way I can be sure is if I buy ginseng root and make ginseng tea from it.
There was a big shakeup here in Australia maybe a decade back. While the industry is not closely monitored here people can make complaints to our Therapeutic Goods Administration. In one case this was from contaminated supplements causing atypical reactions. The entire supplement manufacturing industry was put on hold for a while, and some companies seemed to have disappeared.
PS I wonder if this is a rehash of the study where this was first found. I think it was in the last year or so.
