An extract of the resin of the Siam benzoin tree, listed as a skin-conditioning ingredient.
What it is
Styrax tonkinensis resin extract is an extract of the resin of the Siam benzoin tree, Styrax tonkinensis, of the storax family (Styracaceae). CosIng lists it as a skin-conditioning ingredient.
Where it is used
Appears on the ingredient lists of a small number of products.
Limits of interpretation
The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.
The INCI name does not show the extraction solvent or the content of individual constituents. As a natural material, its composition can vary between batches.
Functions
- Skin conditioning – miscellaneous
- Enhancing the appearance of dry and/or damaged skin by reducing flaking and restoring suppleness.
EU regulation
This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.

