What is glycol distearate doing in your shampoo?
Arin Editorial · how this is made
You see glycol distearate on your shampoo label. It is likely the ingredient behind that pearly, glossy look. Here is what it is and what the safety data says.
What is it?
It is an ester made from stearic acid and ethylene glycol. Two stearic acid units are attached to an ethylene glycol backbone. At room temperature it is a white to cream waxy solid that does not dissolve in water. You find it in shampoos, shower gels, conditioners, makeup and nail care products.
What does it do?
Its main job is visual: as an opacifier and pearling agent, it gives liquids and gels a white, glossy, pearl-like finish. It also adds body to emulsions, controls viscosity and leaves a softening feel on skin. That is why it shows up in shower gels, bubble baths, conditioners, makeup and nail care, not just shampoo. The EU cosmetics database lists it as a viscosity controller, opacifier and emulsifier, mainly in rinse-off products.
What does the safety data say?
Eye and skin irritation studies found no significant irritation. A skin sensitization test classified it as not likely to be sensitizing. It was not toxic to rabbits when tested undiluted. The Cosmetic Ingredient Review panel concluded that it is safe in the present practices of use and concentration.
CIR considers glycol distearate safe in current uses and concentrations.
There is no data that would make you avoid it. This ingredient exists to adjust appearance and texture, not as an active skincare agent. If your skin reacts to a product, look at the whole formula rather than blaming this ingredient alone.
Sources
- EPA ToxValDB (skin/eye irritation and sensitization records)