Is PEG-100 Stearate safe?

PEG-100 Stearate is a synthetic ingredient that functions as an emulsifier and preservative booster in cosmetics. Published reviews from CIR and SCCS have not identified safety concerns with PEG ingredients at typical cosmetic use levels, though individual sensitivities are possible.

What is PEG-100 Stearate used for?

This ingredient acts as an emulsifier, helping to blend oil and water-based ingredients into a stable product, and supports the effectiveness of preservatives. It's commonly used in cleansers, serums, and creams.

Can PEG penetrate skin?

A persistent concern about PEGs is that they're absorbed through the skin, but the published evidence does not support significant penetration at cosmetic use levels. PEGs are primarily water-soluble molecules that sit on the skin surface or rinse away.

emulsifier · surfactant

PEG-100 Stearate

Commonly feared, low concern·Strong evidence

A PEG-based emulsifier that blends oils and water in formulas. It is a workhorse ingredient in stable emulsions and is approved for cosmetic use. Well tolerated.

The myth vs the evidence

Clean beauty brands often avoid PEGs, citing concerns about 1,4-dioxane contamination or their synthetic nature. PEG-100 Stearate is approved and graded safe by regulatory bodies. The published evidence does not support the fear.

Questions

Is PEG-100 Stearate safe?: PEG-100 Stearate is a synthetic ingredient that functions as an emulsifier and preservative booster in cosmetics. Published reviews from CIR and SCCS have not identified safety concerns with PEG ingredients at typical cosmetic use levels, though individual sensitivities are possible.
What is PEG-100 Stearate used for?: This ingredient acts as an emulsifier, helping to blend oil and water-based ingredients into a stable product, and supports the effectiveness of preservatives. It's commonly used in cleansers, serums, and creams.
Can PEG penetrate skin?: A persistent concern about PEGs is that they're absorbed through the skin, but the published evidence does not support significant penetration at cosmetic use levels. PEGs are primarily water-soluble molecules that sit on the skin surface or rinse away.

Products with PEG-100 Stearate

References

Cosmetic information for general education, not medical advice. A verdict is a reading of the published evidence, never a guarantee for your skin: any ingredient can irritate someone, so patch test new products and see a professional if you react. Concern is graded on cited evidence, never on hazard-score lists. See how we score.