Rhamnolipids

Rhamnolipids are biosurfactants—molecules with both water-loving and oil-loving properties—produced naturally by the bacterium Pseudomonas aeruginosa. In skincare formulations, they function as emulsifiers and emulsion stabilisers, helping to blend oil and water-based ingredients into a uniform product. They also contribute to the sensory profile of creams and lotions, often improving spreadability and skin feel.As a naturally-derived ingredient, rhamnolipids offer an alternative to entirely synthetic surfactants, though they perform similar stabilising roles in cosmetic formulations.

Rhamnolipids work by positioning themselves at the boundary between oil and water molecules within a formulation. One end of the molecule is attracted to oils, whilst the other is attracted to water, allowing these normally incompatible substances to mix evenly. This prevents separation or greasiness and keeps the product stable on the shelf.When applied to skin, they also help other ingredients distribute more evenly across the surface, which can enhance the overall sensory experience and absorption profile of the product.

Rhamnolipids are a formulation ingredient, not an active to be used in isolation. Simply use products containing them as directed—typically daily cleansing or moisturising applications. Their benefit lies in how they help deliver other actives and maintain product integrity rather than in standalone use.

Rhamnolipids are generally considered safe in cosmetic use. As with any surfactant, they may cause irritation in sensitive individuals or if used at high concentrations, though typical skincare formulations use amounts well within safety margins.