Super complicated name! Let’s break down what’s going on here.

This is an ingredient that primarily functions as a thickening agent and also an emulsifier.

The science: PEG-150 stands for 150 repeating units of PEG, or polyethylene glycol. Pentaerythrityl refers to a specific chemical structure that the PEG chain is attached to. Finally, Tetrastearate means that it's esterified (changed into an ester, which is the combination of acid and alcohol without water) with four stearic acid (a fatty acid) molecules