Sodium Carrageenan

Sodium carrageenan is a natural polysaccharide extracted from red seaweed. In skincare formulations, it functions primarily as a thickening and stabilising agent, helping to create a uniform texture and prevent separation of oil and water-based ingredients.Beyond texture control, carrageenan has adhesive properties that allow it to form a light film on the skin surface. This film-forming capacity may help retain moisture and support the delivery of other active ingredients into the skin.

Sodium carrageenan is a polysaccharide with a high affinity for water. When dissolved in a formulation, its long-chain molecules bind water molecules together, increasing viscosity and creating a stable gel-like structure. This thickening effect prevents products from separating into their constituent parts.On the skin, carrageenan deposits a thin polysaccharide layer that can help occlude moisture loss without creating a heavy or occlusive barrier. Research suggests this film-forming property may also create a favourable environment for other actives to penetrate more effectively into deep…

Sodium carrageenan is typically used at low concentrations (around 0.2% of a formula) as a thickening and stabilising agent rather than as an active ingredient. There is no special usage guidance required; simply use the product as directed. It works well in serums, gels, and hydrating creams where a lightweight texture is desired.

Sodium carrageenan is generally well-tolerated and has a long history of use in food and cosmetics. It is unlikely to cause irritation in most skin types, though those with known seaweed sensitivities should avoid it.