PGPR is polyglycerol polyricinoleate -- an emulsifier made from glycerol and fatty acids. It's used to modify the flowability of molten chocolate and is typically less than 1/2 percent of the chocolate mix. If a company is using more than that the chocolate probably isn't going to harden... It's one of the hundreds of "mostly harmless" additives you see everywhere these days not a filler. Whether all these additives are really ok once you put them in every single thing has yet to be seen.
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