Thermal water is mineral-rich spring water (containing elements such as selenium, silica, zinc, and various salts) used in skincare to hydrate, calm, and reduce irritation. It is typically used as a base or supportive ingredient rather than a treatment active.
| Reported effect | How often | Notes |
|---|---|---|
| Transient skin tightness or dryness on evaporation | Uncommon | Mineral residue can leave skin feeling tight if not followed by a moisturizer. |
| Mild irritation or stinging on compromised skin | Rare | Possible on broken or highly sensitive skin due to mineral content. |
| Allergic contact reaction | Very rare | Reactions are generally attributed to other formulation components rather than the water itself. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.