Propylene Glycol Stearate

Benefits
Softening
Concerns
Malassezia Feeding

What is Propylene Glycol Stearate?

Propylene Glycol Stearate is a diester compound produced through the esterification of propylene glycol, a colorless viscous alcohol derived from petroleum or plant sources, and stearic acid, a long-chain saturated fatty acid obtained from vegetable oils such as palm kernel or coconut. Commonly found in skincare products like moisturizers, foundations, shampoos, and body washes, it plays a key role in formulation science. As an emulsifying agent, it creates a barrier at the oil-water interface, preventing phase separation and delivering uniform consistency. It also works as an emollient to lubricate the skin surface, enhancing smoothness, and as a surfactant to reduce surface tension for better spreading and cleansing. Furthermore, it contributes mild fragrance masking and skin conditioning properties, supporting overall product performance in rinse-off and leave-on applications.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Fragrance ingredient
Contributes scent character and/or masks base odors, shaping the overall sensory experience of the formula (subject to allergen and IFRA considerations).
Emollient
Softens and smooths skin by filling in surface roughness and improving slip; can also help reduce moisture loss when paired with occlusives and film formers.
Surfactant
Lowers surface tension to enable cleansing, emulsifying, and foaming; central to shampoos, body washes, and many emulsions and micellar systems.
Emulsifying agent
Enables stable mixing of oil and water phases by forming an interfacial film, helping create lotions, creams, and cleansers with consistent texture.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.

Benefits

Provides softening effect by smoothing skin surface and reducing roughness.

Supports emulsion stability for consistent lotion and cream textures.

Aids in moisture retention when combined with other emollients.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Users looking for smoother skin feel from emollient ingredients.
Those prone to Malassezia-related skin issues like fungal folliculitis.
People formulating or using stable emulsion-based products.
People sensitive to glycol esters in high concentrations.
Individuals preferring non-comedogenic (rating 0) options in daily routines.
Users avoiding potential fragrance contributors in sensitive formulas.

Safety Notes

  • Low hazard rating from 1 to 1 on established cosmetic safety scales.
  • Non-comedogenic with a rating of 0, suitable for acne-prone skin types.

Frequently Asked Questions about Propylene Glycol Stearate

What does Propylene Glycol Stearate do in products?

It emulsifies oil and water, softens skin, and aids cleansing as a mild surfactant.

Is it safe for sensitive skin?

It carries a low safety rating and low irritation potential in cosmetics.

Does it contribute to fungal acne?

Noted as a potential Malassezia feeding ingredient, so caution advised for prone users.