Zinc Stearate

What is Zinc Stearate?

Zinc stearate is the zinc salt of stearic acid, a saturated fatty acid sourced from plant oils like palm or coconut, or sometimes animal fats. It appears as a soft, white, odorless powder insoluble in water. In cosmetics, it primarily features in powder-based products such as eyeshadows, blushes, foundations, and setting powders. It works by absorbing excess moisture to inhibit clumping, ensuring powders remain free-flowing and easy to apply. As a lubricant, it reduces friction for smoother gliding on skin. It also scatters light for a subtle opacity and aids in binding pigments for even color distribution. Additionally, it influences formulation thickness, promoting stability in suspensions and enhancing overall product handling during manufacturing and use.

Comedogenic Rating 0/5 Low risk of clogging pores

EWG Safety Rating 2 View on EWG →

PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Anticaking agent

Prevents powders from clumping by reducing moisture pickup and improving flow, keeping loose and pressed powders uniform during storage and use.

Colorant

Provides or corrects color using dyes or pigments, helping achieve a consistent shade and visual appearance across batches and throughout wear.

Slip modifier

Improves the spreadability and glide of products on skin.

Viscosity controlling agent

Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

Helps powders stay dry and free-flowing by absorbing moisture.

Enhances smooth application and glide on skin surfaces.

Supports even color and texture consistency in makeup formulations.

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 of powder cosmetics seeking clump-free, easy-to-apply products.	Those with known allergies to zinc compounds.
Individuals preferring smooth, non-sticky makeup textures.	People sensitive to fatty acid derivatives.
People wanting stable, long-lasting powder formulations.	Individuals experiencing irritation from powder-based products.

Safety Notes

Rated low hazard by EWG with verified safety in cosmetics.
Deemed safe for use in cosmetics by Cosmetic Ingredient Review.

Frequently Asked Questions about Zinc Stearate

What is zinc stearate used for in cosmetics?

It acts as an anticaking agent, slip modifier, colorant, and viscosity controller mainly in powders.

Is zinc stearate safe for skin?

Yes, it's considered low hazard and safe as used in cosmetics by authoritative reviews.

Does zinc stearate cause irritation?

Evidence shows low irritation potential in typical cosmetic concentrations.