Water/Aqua/Eau ●
TL;DR. This ingredient is the primary solvent and diluent in many formulas, dissolving hydrophilic ingredients and setting viscosity, spread, and sensory feel. It often forms the continuous phase in emulsions, gels, cleansers, and sprays.
What does Water/Aqua/Eau do in a cosmetic formula?
This ingredient is the primary solvent and diluent in many formulas, dissolving hydrophilic ingredients and setting viscosity, spread, and sensory feel. It often forms the continuous phase in emulsions, gels, cleansers, and sprays.
Is Water/Aqua/Eau clean?
From a clean-beauty perspective, it is well-tolerated and unproblematic. The main quality issue is purity and microbial control, so formulas that contain it usually need appropriate preservation and manufacturing hygiene.
Is Water/Aqua/Eau sustainable?
Its sustainability profile depends on local sourcing, purification energy, and responsible use in manufacturing. It does not persist as a pollutant, but wastewater management and reduced process consumption matter at scale.
Is Water/Aqua/Eau COSMOS-approved?
It is permitted under COSMOS-natural and COSMOS-organic standards, although it is not counted as organic content. It aligns well with Green Chemistry as a benign, nonflammable solvent, especially when purification and processing are efficient.
How does Water/Aqua/Eau work chemically?
This small polar molecule has strong hydrogen-bonding capacity and a high dielectric constant, which makes it effective for dissolving salts, acids, bases, humectants, and many botanical extracts. It is commonly used from trace levels to more than 90% of a formula, is stable across normal cosmetic pH ranges, and increases the need for preservation when present in appreciable amounts.
Last updated 2026-05-13