INCI · other · CIR review pending · used in 125 products
Water
Water (INCI: Aqua) is the most common skincare ingredient, typically appearing first on ingredient lists, indicating it is the largest component by volume. It primarily functions 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 that allows other ingredients to dissolve and function effectively in a formula. Once incorporated into the skin, it contributes to hydration; however, applying pure water topically (e.g., prolonged bathing) can actually be drying to the skin.
hydrating
● Cautions
Applying pure water directly and repeatedly to the skin (e.g., long baths) can be drying rather than hydrating.
