Polyglyceryl-10 Pentaisostearate

Polyglyceryl-10 pentaisostearate is a synthetic ester derived from glycerin and isostearic acid. It functions as both an emollient and emulsifier, meaning it softens the skin whilst also helping to blend water and oil-based ingredients together in a formula.This ingredient is relatively uncommon in skincare products, appearing in approximately 0.1% of formulations. Its dual role makes it useful in creams, lotions and other emulsified products where texture and stability are important.

As an emollient, polyglyceryl-10 pentaisostearate sits on the skin's surface and fills in irregularities, creating a smoother texture and reducing transepidermal water loss. Its molecular structure allows it to be compatible with both water and oil phases in a formula, which is why it also functions as an emulsifier.The ingredient does not penetrate deeply into the skin; instead, it works at the surface level to improve feel and support the stability of the product itself.

This ingredient is typically found as part of a complete formulation rather than used in isolation. Use as directed by the product instructions; no special application technique is required. As with any new skincare product, introduce it gradually and monitor your skin's response over 1-2 weeks.

Generally well-tolerated and recognised as safe by cosmetic regulators. Some individuals with fungal acne have reported sensitivity to certain synthetic esters; if this applies to you, consider patch testing first.