Excellent suggestion, it has now been added to the FAQ.
Does your e-liquid contain Diacetyl?
No, Halo does not contain Diacetyl in any of our e-liquid formulas. This was a strict requirement for Halo far before it became a popular topic in the forums. In addition, our e-liquid also does not contain Acetoin, Acetyl, Propionyl, 2-3 Hexanedione, 2-3 Heptanedione, or Diacetyl Trimer which are often used as Diacetyl equivalents.