PEG-150 Distearate

PEG-150 Distearate is a synthetic ingredient formed from polyethylene glycol (PEG) combined with two stearic acid molecules. According to its EU CosIng listing, it functions as an emulsifying agent, surfactant and viscosity-controlling agent, which means it's included in formulations to help a product work and feel the way it's designed to, rather than to deliver a skin benefit on its own.

You'll typically find PEG-150 Distearate in cleansers, creams, lotions and other water-and-oil-based products, where it helps combine ingredients that wouldn't normally mix, such as oils and water. It is a formulation ingredient, not an active skincare ingredient, and its role is behind the scenes rather than on the label as a headline benefit.

As an emulsifier, PEG-150 Distearate reduces the surface tension between oil and water, allowing them to combine into a stable, uniform cream or lotion rather than separating on the shelf. Its surfactant properties also help it interact with oils and debris on the skin's surface, supporting the cleansing action of products such as facial washes.

Its role as a viscosity-controlling agent means it can also be used to adjust how thick or thin a formula feels, contributing to the texture and spreadability of a product. In short, it is a functional ingredient that supports a formula's stability and feel, rather than one associated with a specific skin-condition benefit.

Key points

• Functions as an emulsifier, helping oil and water-based ingredients combine into a stable formula.
• Acts as a surfactant, supporting the cleansing action in washes and cleansers.
• Used as a viscosity-controlling agent to help achieve a product's intended texture.
• Contributes to the overall stability and shelf life of emulsion-based products such as creams and lotions.
• A well-established formulation ingredient used widely across cosmetic and personal care products.

Is PEG-150 Distearate an active skincare ingredient?

No. It is a formulation ingredient — specifically an emulsifier, surfactant and viscosity-controlling agent — used to help blend, stabilise and texture a product. It doesn't have an established cosmetic function as an active ingredient targeting a specific skin concern, so it's best understood as part of the product's base rather than its main benefit.

Is PEG-150 Distearate safe to use on skin?

PEG compounds have a long history of use in cosmetic formulations as emulsifiers and are permitted for use in the EU and UK. As with any ingredient, individual sensitivity can vary, so if you have particularly reactive skin, patch testing new products is always a sensible precaution.