Here is another report on the same subject from the
'Agency for Toxic Substances and Disease Registry' ...
Remember, although similar, Ethylene Glycol and Propylene Glycol are two entirely different chemicals. It is ethylene glycol, for example, which is a more common ingredient in anti-freeze and which is, in fact, highly toxic. Simply because propylene glycol has many different applications does not make all the products which contain it the same.