What is a Part Per Million Anyway?

When I was first diagnosed with CD in May of 2005, the Codex Alimentarius standard for “gluten-free” was 200 ppm (ppm stands for Parts Per Million).  It is now 20 ppm.  I even read on Celiac.com that at one point (article was written in 2000), anything lower than 500 ppm was considered “safe.” As you […]