Thermal Spring Water

What is it?

Mineral-rich water sourced from natural thermal springs, used by several skincare brands (including as a named ingredient in some La Roche-Posay products) for its traditional skin-soothing reputation.

What does it do?

According to PubMed, a 2025 review on thermal spring water for skin health describes real anti-inflammatory, immunomodulatory and skin-barrier-reinforcement potential, bridging traditional spa therapy with modern dermatology -- a real, directly on-topic review, though published as a letter rather than reporting new controlled-trial data of its own.

Sources