Octyldodecyl Stearoyl Stearate

What Is It?

Octyldodecyl Stearoyl Stearate is an amber yellow liquid. In cosmetics and personal care products, Octyldodecyl Stearoyl Stearate is used in the formulation of eye makeup, blushers, foundations and other makeup products. It is also used in skin care and cleansing products.

Why Is It Used?

Octyldodecyl Stearoyl Stearate slows water loss from the skin by forming a barrier on the skin’s surface. It is also used to increase the thickness of the lipid (oil) portion of cosmetics and personal care products.

Scientific Facts

Octyldodecyl Stearoyl Stearate is made from a naturally occurring fatty acid, stearic acid. Stearic acid is found in animal and vegetable fat.

Safety Information

The safety of Octyldodecyl Stearoyl Stearate has been assessed by the Cosmetic Ingredient Review (CIR) Expert Panel. The CIR Expert Panel evaluated available scientific data and concluded that Octyldodecyl Stearoyl Stearate was safe as used in cosmetics and personal care products.

CIR Safety Review: In addition to a review of the information on Octyldodecyl Stearoyl Stearate, data on octyl dodecanol, stearic acid, and octyl stearate were included in the report as these ingredients have been reviewed previously by the CIR Expert Panel and found safe at concentrations used in cosmetics and personal care products.

The available safety data on these ingredients were considered to be supportive of the safety data on Octyldodecyl Stearoyl Stearate. Skin permeation and penetration data on Octyldodecyl Stearoyl Stearate indicated that only a small portion of the applied dose permeates the skin. Based on these data, the CIR Expert Panel did not expect a significant amount of Octyldodecyl Stearoyl Stearate to be available to result in systemic exposure.

There was no evidence of systemic toxicity associated with any of the structurally related chemicals reviewed in previous safety assessments. None of the available data suggested a concern about adverse skin reactions to Octyldodecyl Stearoyl Stearate, or to any of the related chemicals. Only a mild, transient ocular irritation was associated with Octyldodecyl Stearoyl Stearate or any of the related chemicals.

When made from plants, Octyldodecyl Stearoyl Stearate may be used in cosmetics and personal care products marketed in Europe according to the general provisions of the Cosmetics Regulation of the European Union. Ingredients of animal origin must comply with the European Union animal by-products regulations.

Link to the EU Cosmetic Regulation: 

More Scientific Information

Octyldodecyl Stearoyl Stearate is an ester used as a skin conditioning agent and viscosity increasing agent in cosmetics and personal care products. Chemically, esters are covalent compounds formed between acids and alcohols. Esters can be formed from almost all acids (inorganic and carboxylic) and any alcohol. They are subject to hydrolysis back to the original alcohols and acids at extreme pHs and at elevated temperatures.