A clinical trial found that Avène reduces the severity of atopic dermatitis (eczema) when added to a cream, and decreased the amount of inflammation-causing bacteria on the skin. Avene also reduced the severe peeling that’s usually a side effect of using tretinoin as an acne treatment. La Roche-Posay also managed to help 50% of a clinical trial group suffering from psoriasis, although that study involved drinking the water as well as applying it on the skin. You’d expect that a higher mineral content might work better, but interestingly, comfort, softness and suppleness are better with a lower mineral content, and irritation is lowest (it’s worth noting though, that this particular study was performed by the parent company of Avène, the lowest mineral content water). Neisseria gonorrhoeae was reported to have very likely been acquired from bathing in a hot spring according to one case study, with the near-body temperature, slightly acidic, isotonic, organic matter-containing waters thought to facilitate the survival of the pathogen. [76]

Avène Thermal Spring Water, for example, features a 1/2 ratio of calcium to magnesium; it is also rich in silica and trace elements. La Roche-Posay Thermal Spring Water, on the other hand, is naturally rich in selenium.

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Because heated water can hold more dissolved solids than cold water, the water that issues from hot springs often has a very high mineral content, containing everything from calcium to lithium and even radium. [28] The overall chemistry of hot springs varies from alkaline chloride to acid sulfate to bicarbonate to iron-rich, each of which defines an end member of a range of possible hot spring chemistries. [29] [30] Chen XH, Shao ZG, Xiong XS, Gao R, Liu XJ, Wang CF, Li B, Wang ZZ, Zhang YP (2019) Fault system, deep structure and tectonic evolution of the Qilian Orogenic Belt, Northwest China. Geology in China 46(5):995–1020 (in Chinese with English abstract) Des Marais, David J.; Walter, Malcolm R. (2019-12-01). "Terrestrial Hot Spring Systems: Introduction". Astrobiology. 19 (12): 1419–1432. Bibcode: 2019AsBio..19.1419D. doi: 10.1089/ast.2018.1976. PMC 6918855. PMID 31424278. Editor’s Note: We reviewed this article on September 19, 2023. As per our editorial policy, we are constantly updating our content, to make sure it reflects the best of the best when it comes to beauty, wellness, and fashion. We want to assure our readers that we still stand by our recommendations, which we do. The 303 hot springs of Kokonoe in Japan produce 1,028liters/second, which gives the average hot spring a flow of 3.39liters/second.

Seite S. (2013). Thermal waters as cosmeceuticals: La Roche-Posay thermal spring water example. DOI:The main benefit of thermal water is considered to be its soothing or calming benefits to the skin. This is why it is often recommended for inflammatory skin conditions such as eczema, psoriasis and ichthyosis. Most of the research that has been conducted has been on the Avène and La Roche-Posay thermal waters. This means that most of the research has been conducted on their thermal waters and the specific mineral concentrations that are present in their product. This doesn’t mean that other thermal waters wouldn’t produce the same benefits as the Avène and La Roche-Posay just that these two are the most well-reserached. I am a summer girl, and I like bright, sunny days, which uplift my mood and energy. However, the harsh sun rays cause severe skin tanning and itching that I absolutely dislike. This thermal water cannot help with the tanning part but the anti-irritant and anti-itching formula aid in soothing the sun-burnt skin. Can you use La Roche-Posay thermal spring water as a setting spray?