Senators McCaskill and Collins sent letters to FDA and 15 retailers of dietary supplements.
NY AG Schneiderman and IN AG Zoeller identified four "major flaws" in FDA's cGMPs for dietary supplements.
The senators also criticized the “inconsistent” enforcement actions of the Department of Justice under Lynch’s predecessor, Eric Holder.
The move comes less than a week after FDA enforced against a different stimulant adulterant.
FDA has drawn criticism for failing to act despite being aware of the adulteration.
The push for regulating the ingredient comes after two young men died from using powdered caffeine last year.
Companies can reference warning letters to learn what not to do, the association says.
That FDA is studying gluten contamination in "gluten-free" foods is an indication that FDA plans to monitor this claim closely.
Celebrations are shadowed by suspicions that some are treading on the law.
How heavily do FOP labels influence consumer purchasing habits, and how can we ensure that messages aren't confusing?
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