Bold moves from the New York State attorney general’s (AG) office are shaking up the supplement industry. In February, the AG accused four retailers (GNC, Target, Walmart, and Walgreens) of selling supplements that failed to contain their labelled ingredients. Using a testing method called “DNA barcoding“, the AG’s office concluded that few of the products it tested actually contained the labelled ingredient, and some contained undisclosed ingredients. It demanded that they stop the sale of those products. All four retailers complied.
When the recall occurred, I noted that the AG may not have had an airtight case: manufacturers and other critics challenged the AG’s methodology, claiming that DNA barcoding was unvalidated, inappropriate, and insufficient. They also stated that the DNA may not survive processing, so the absence of DNA didn’t imply a lack of the original product. Some claimed that the “contaminants” that AG found could have been acceptable fillers. The Attorney General refused to release further information about the testing methods it used, raising further questions about its validity. (more…)