Zantac users may have been exposed to unsafe levels of NDMA over prolonged periods of time. According to the FDA, the safe daily intake limit for NDMA is 96 ng. The Valisure testing found NDMA levels in a single 150 mg tablet to be as high as 2,511,469 ng – which is 26,000 times greater than the safe daily limit. The FDA’s own testing found lower levels of NDMA in Zantac, but even these levels were 3,000 times the daily acceptable limit.
The Valisure testing was done right.  They used the FDA’s gold standard gas chromatography/mass spectrometry protocol.  You don't a whole lot of objection that this study was flawed in any.  So, as they should, Valisure sounded the alarm.