PEG-150 Pentaerythrityl Tetrastearate can be used to thicken products and is a light skin conditioner.  

It also contributes to the cleanser's gentleness, as it has been shown to lower the potential for irritation and imparts mildness.

PEG 150 is a high weight PEG and is not easily absorbed. In a study published in the Toxicology journal in 2005, entitled ""Safety assessment on polyethylene glycols (PEGs) and their derivatives as used in cosmetic products,"" it was concluded that: ""Taking into consideration all available information from related compounds, as well as the mode and mechanism of action, no safety concern with regard to these endpoints could be identified.

The Environmental Working Group (EWG's) Skin Deep is the world's largest personal care product safety guide. They rate ingredients according to their hazard score on a 0-10 scale from low to high hazard. For example, they give water a score of 0.

Accordingly they have rated PEG-150 Pentaerythrityl Tetrastearate with a score of 3.