Sodium cetyl sulfate

// Evidence: Cleansing ingredients remove sebum, dirt, cells, and cosmetics through surfactant action, emulsification, or solubilization. Surfactants reduce surface and interfacial tension, allowing water to wet oily surfaces. Micelle formation enables hydrophobic substances to be solubilized and rinsed away. Must balance efficacy with mildness to avoid stripping natural lipid barrier.

// Evidence: Foaming agents (surfactants) reduce surface tension allowing air incorporation and stabilization as bubbles. Foam generation requires surfactant adsorption at air-water interface with hydrophobic tails toward air, mechanical agitation introducing air, and stabilization through surfactant films. Anionic surfactants (sodium laureth sulfate) and amphoteric surfactants (cocamidopropyl betaine) are primary foaming agents.

// Evidence: Cleansing surfactants specifically formulated for removing sebum, dirt, and impurities. Primarily anionic (sodium laureth sulfate, sodium cocoyl isethionate) and amphoteric surfactants (betaines). Mechanism involves reducing surface tension enabling water to wet oily surfaces, solubilizing lipophilic materials in micelles, and emulsifying oils for rinse-off. Cleansing efficacy balanced with mildness by surfactant selection, concentration, and pH optimization. Must avoid excessive lipid removal that compromises barrier function.