INCI · other · CIR review pending · used in 32 products
Aqua (Water)
Water (Aqua, H2O) is the most common skincare ingredient and is typically found at the top of ingredient lists, indicating it is the largest component by volume. It functions primarily as a solvent for water-soluble ingredients. The water used in cosmetics is purified and deionized, meaning nearly all mineral ions are removed to improve product stability over time.
Evidence level
strongEWG score
—Comedogenic
—Category
other● Benefits
Water acts as a solvent for ingredients that do not dissolve in oils. Once inside the skin it contributes to hydration, though applying pure water topically can actually be drying rather than hydrating.
hydrating
● Cautions
Applying pure water directly to skin (e.g., prolonged baths) can be drying rather than hydrating.
