Foam boosting

Ingredients with the function of enhancing foaming help cleansers to form a more abundant, dense and stable foam. In cosmetics, this is important not only for a pleasant feeling when using, but also for a stable texture of the formula: the foam distributes shampoo, shower gel or face wash foam more evenly and makes it easier to wash off the product. According to industry reference books, such substances improve the volume, texture and stability of foam, and in practice often work as auxiliary surfactants next to the main cleaning components. (productingredients.com)

For skin and hair, this means a softer and more comfortable cleansing, especially when the formula combines several types of surfactants. Many foam-strengthening components simultaneously reduce the feeling of stiffness from more aggressive detergents, can slightly increase the viscosity of the product and make the foam more "creamy". Therefore, they are often added to shampoos, shower gels, liquid soaps and baby cleansing products, where a balance between cleansing, softness and pleasant sensory is important. (goodformulations.com)

Typical examples of such ingredients are cocamidopropyl—Cocamidopropyl Betaine and Cocamidopropyl Hydroxysultaine. Both belong to mild amphoteric surfactants and are often used as surfactants: they help make the foam thicker and more stable, and the formula is more delicate for the scalp and body. That is why they are so often seen in formulations where the manufacturer wants to get good foaming without feeling excessively "harsh" cleansing. (cosmileeurope.eu)