Hydrocolloids are polysaccharides or high molecular weight proteins that, when dispersed in water, form three-dimensional structures capable of thickening or gelling, modifying the texture of products and stabilizing mixtures. This ability to retain water and interact with other components makes them essential in food, where they prevent syneresis, improve shelf life, and maintain sensory quality. Ingredients like xanthan gum, carrageenan, agar, and pectin are widely used in gelatins, desserts, yogurts, sauces, and beverages, as well as in vegan and gluten-free formulations.

These same functional properties have been harnessed in natural cosmetics, where hydrocolloids stand out for their ability to stabilize and thicken aqueous formulations. Those of natural or biotechnological origin are prioritized, valuing their rheological behavior and compatibility with cosmetic actives. Xanthan gum, with its pseudoplasticity, is ideal for serums, gels, and masks. Carrageenan, extracted from algae, provides gel-like textures in peel-off masks, shower gels, or toothpaste. Guar gum is used in lotions and conditioners for its high viscosity, while sodium alginate, when combined with calcium, allows for peel-off masks with a film-forming effect.

Other relevant hydrocolloids include pectin, effective in acidic media; gum arabic, with film-forming properties for eyeliners or mascaras; microcrystalline cellulose, which improves stability and texture; and starches, which act as thickeners and absorbents in dry or creamy formats.

The strategic combination of hydrocolloids allows for the formulation of natural cosmetic products with pleasant textures, high stability, and sensory efficacy. Among the most representative examples in the market are serums with hyaluronic acid and xanthan gum, or peel-off masks with alginate and marine extracts, showcasing the versatility of these ingredients in modern cosmetic design.