Maris Aqua

Maris aqua is seawater—a mineral-rich solution harvested from marine sources. In skincare formulations, it serves as a humectant and solvent, meaning it helps to draw water into the skin whilst also aiding in dissolving and dispersing other ingredients throughout a product.Seawater contains dissolved minerals including sodium, magnesium, calcium and potassium, which contribute to its hydrating and conditioning properties. It is found in a small proportion of skincare products, typically at modest concentrations.

Maris aqua works primarily as a humectant—a substance with a molecular structure that naturally attracts and binds water molecules. When applied to skin, it draws moisture from the environment and deeper skin layers into the stratum corneum, the outermost layer. This process temporarily increases skin hydration and can improve the feel and appearance of the skin.The mineral content of seawater may also provide mild conditioning effects, though the concentration of minerals in cosmetic formulations is typically modest and their individual contribution to skin benefit remains limited in evide…

Maris aqua is generally incorporated into formulations by the manufacturer and does not require special application instructions. It works best in products designed to hydrate—serums, toners and moisturisers. For optimal hydration benefit, apply to damp skin and follow with an occlusive moisturiser to seal in the water that maris aqua has drawn into the skin.

Maris aqua is generally well-tolerated and considered safe for skincare use. Those with sensitivity to salt or mineral content may wish to patch test first, particularly if prone to irritation.