Sea Water

Sea water is a complex aqueous solution containing sodium chloride, magnesium, potassium, calcium and other mineral salts, along with trace elements. In skincare formulations, it functions primarily as a humectant—drawing moisture into the skin—and as a solvent to dissolve and deliver other actives.Sea water appears in roughly 0.7% of skincare products, typically at concentrations ranging from 5% to 83% depending on the formulation type. Its mineral profile varies depending on the water source, with Dead Sea water notably higher in magnesium and other salts compared to standard ocean water.

Sea water hydrates the skin through osmotic action—its dissolved salts and minerals create a concentration gradient that encourages water to move into the stratum corneum. This humectant effect is enhanced by the presence of magnesium and other electrolytes, which support cell function and barrier integrity.The mineral composition also appears to have mild anti-inflammatory and antioxidant properties, particularly in Dead Sea water formulations where mineral concentrations are notably higher. These minerals may help stabilise skin cells and reduce inflammatory responses to environmental str…

Sea water formulations work best when layered with other hydrating ingredients—apply to damp skin followed by a humectant serum and occlusive moisturiser to lock in the hydration. If the product contains high salt concentrations (above 10%), use sparingly on sensitive or compromised skin barriers, and always follow with a barrier-supporting cream.

Sea water is generally well-tolerated, though high salt concentrations may cause irritation or dryness in sensitive individuals. Those with very compromised barrier function should patch test first.