Weekend Wonderings: What’s a plasticizer? Can we add BTMS to lotion bars? Why don’t I use GSE or Vitamin E as preservatives?

WHAT IS A PLASTICIZER?In this post on sorbitol, Marjo asks: I am suddenly obsessed with this plasticizer reference… Sorbitol is one of them. I think cyclomethicone is increasing spreadability so that is a plasticizer too? Or do they also need to do film forming? Are there more like these and would we want them to be in a…