Polyglyceryl-4 Diisostearate …

Polyglyceryl-4 Diisostearate/Polyhydroxystearate/Sebacate is a synthetic emulsifier derived from polyglycerin (a modified sugar-based compound) combined with fatty acid derivatives. It functions primarily to blend oil-soluble and water-soluble ingredients in formulations, preventing them from separating.This ingredient belongs to the polyglyceryl ester family of emulsifiers, commonly used in skincare products to create stable creams, serums, and lotions. It appears in roughly 0.6% of skincare products on the market.

Emulsifiers are molecules with a hydrophilic (water-loving) head and a lipophilic (oil-loving) tail. Polyglyceryl-4 Diisostearate/Polyhydroxystearate/Sebacate positions itself at the boundary between oil and water phases, reducing surface tension and allowing them to mix and remain stable.This prevents the typical separation that would otherwise occur when oils and water-based components are combined, ensuring the product maintains a uniform consistency and texture during storage and use.

This ingredient is used by formulation chemists, not consumers — you won't apply it directly. Simply use products containing it as directed. If you notice any irritation or worsening of acne after introducing a product with this emulsifier, discontinue use and consider whether it might be a contributing factor for your individual skin.

Polyglyceryl emulsifiers are generally well-tolerated and approved for use in cosmetics across major regulatory bodies. Those with fungal acne sensitivity should patch test first.