Purified water is the most common solvent and vehicle in skincare formulations, used to dissolve ingredients and form the base of emulsions and aqueous products. It is biologically inert and serves no direct therapeutic role.
| Reported effect | How often | Notes |
|---|---|---|
| Skin irritation | Very rare | Pure water is non-irritating; rare reports relate to extremely deionized water transiently disrupting skin barrier on prolonged exposure. |
| Transepidermal water loss/dryness | Rare | Excessive contact or frequent washing can contribute to barrier disruption and dryness, not a true allergic effect. |
| Allergic reaction | Very rare | Aquagenic urticaria is an exceptionally rare condition causing hives upon water contact. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.