Water is the most common base ingredient in cosmetics, serving as a solvent and dispersing medium for water-soluble ingredients and forming the continuous phase of emulsions. It is purified (deionized or distilled) before use in formulations.
| Reported effect | How often | Notes |
|---|---|---|
Skin irritation or dryness | Very rare | Pure water itself is essentially non-irritating; rare effects relate to disruption of skin barrier with excessive exposure rather than chemical sensitivity. |
Allergic reaction | Very rare | True allergy to water (aquagenic conditions) is extremely uncommon and not an ingredient sensitivity per se. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.