A synthetic beta-alanine derivative, listed as a skin-conditioning and cleansing ingredient.
What it is
Ethyl butylacetylaminopropionate is ethyl N-acetyl-N-butyl-beta-alaninate, a synthetic derivative of the amino acid beta-alanine, best known under the name IR3535 as an insect repellent substance. CosIng lists it as a skin-conditioning agent and cleansing surfactant.
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.
Functions
- Skin conditioning
- Maintaining the skin in good condition.
- Surfactant – cleansing
- Wetting body surfaces, emulsifying or solubilizing oils, and suspending soil (generally, such ingredients contribute to the foaming and lathering properties of cleansing products).
EU regulation
This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.

