What it is
Propylene glycol stearate is a waxy solid formed by esterifying propylene glycol with stearic acid. In sunscreens and moisturizers it acts as a nonionic co-emulsifier that helps blend oil and water phases, and it adds body, smoothness, and a conditioning feel to the finished product. It is commonly used in lotions and creams to support a stable, uniform texture.
Safety & warnings
Propylene glycol stearate is generally well tolerated and is not associated with significant irritation at typical use levels. Because it is based on a long-chain fatty acid, very rich formulas may feel heavy on oily or acne-prone skin, but it is widely used without issue. It is not a known fragrance allergen.
Origin & sourcing
Synthetic, made by esterifying propylene glycol with stearic acid; the stearic acid is often sourced from plant or animal fats.
Questions everyone asks
What is propylene glycol stearate used for?
It serves as a nonionic emulsifier and emollient, helping blend oil and water and giving creams a smooth, stable texture.
Is propylene glycol stearate the same as propylene glycol?
No, it is an ester of propylene glycol and stearic acid, which makes it a waxy emulsifier rather than the small humectant molecule propylene glycol.