In addition to the six known types of hot spring qualities with skin-beautifying effects, a new type has been discovered, expanding the possibilities of skin-beautifying hot springs and making the choice of hot springs even more diverse. This discovery, made by POLA ORBIS HOLDINGS, is also introduced on the newly launched website “Skin-Beautifying Hot Spring Guide.”

The “7th Skin-Beautifying Spring Quality” has both the function of enhancing the protective function of the stratum corneum cells and a cleansing effect that removes excess sebum.

POLA ORBIS HOLDINGS has been advancing scientific research on the skin-beautifying effects of hot springs. Six types of skin-beautifying spring qualities were previously known, but this latest research has confirmed one additional new skin-beautifying effect. The hot spring recognized as the “7th Skin-Beautifying Spring Quality” has been found to have both a function that enhances the protective function of the stratum corneum cells and a cleansing effect that removes unnecessary sebum. Specifically, this new effect was confirmed at Kuroyu Natural Hot Spring (SPA & HOTEL Nagomi) in Ota City, Tokyo.
With this discovery, the total number of skin-beautifying spring qualities has reached seven, deepening the understanding of how each spring quality affects the skin. These spring qualities are classified based on their effects on the stratum corneum cells and sebum. The scientific elucidation of each spring quality’s skin-beautifying effects, such as the protection of the stratum corneum and cleansing effects, is expected to expand the options for choosing hot springs.
In line with this new discovery, POLA ORBIS HOLDINGS has launched a website called “Skin-Beautifying Hot Spring Guide.” This site provides a search function that allows users to find hot spring facilities by spring quality and effect, enabling them to find the best hot spring according to their skin condition and preferences. The site also proposes new ways to enjoy hot springs, such as “Kiki-Yu,” where visitors combine multiple skin-beautifying spring qualities.
POLA ORBIS HOLDINGS has expressed its intention to continue its research on the skin-beautifying effects of hot springs, expecting to discover even more skin-beautifying spring qualities in the future, thereby providing experiences that allow visitors to enjoy the appeal of hot springs more deeply.

The Skin-Beautifying Hot Spring Guide can be accessed here.