Viscosity controlling

Ingredients with viscosity control function help to make cosmetics thicker, more fluid or, conversely, dense and "assembled". Simply put, they regulate how the product is distributed over the skin and hair, squeezed out of the package, whether it spreads and how comfortable it feels when applied. Thanks to this, the cream keeps its shape, the gel does not become too liquid, and shampoo or serum are easier to apply evenly. In the CosIng database, this function is described as the cosmetic role of ingredients that affect the viscosity of the formula, that is, its consistency and stability. (single-market-economy.ec.europa.eu)

For skin and hair, such components usually do not work directly as care assets, but through the quality of the texture itself: the product is better distributed, drains less, is more conveniently dosed and can leave a more even coating. This is especially important for masks, conditioners, cleansing gels, sunscreens and decorative cosmetics, where consistency affects both comfort and uniformity of application. Without such substances, emulsions and gels may delaminate or be too liquid for convenient use; the safety and composition of cosmetics must be confirmed by the manufacturer, and the ingredients indicated on the label. (fda.gov)

Typical examples are Xanthan Gum and Carbomer. Xanthan gum is often used to create more stable, soft-feeling gels and emulsions; European Commission documents also note its ability to form and maintain viscosity. Carbomer is a classic gel—forming agent that helps to obtain transparent gels and control the density of aqueous formulas. As a result, such ingredients primarily affect the texture, stability, and usability of the product, and through this, the overall consumer perception of care. (joint-research-centre.ec.europa.eu)