Q & A
Frequently Asked Questions
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Which spring types are considered beauty springs?
Any spring type containing 50 mg/kg or more of metasilicic acid qualifies. Bicarbonate (cleansing), chloride (moisturising), and sulfate (regenerating) springs are the three most representative types with official indications for dry skin.
Can onsen cause skin irritation?
Acidic and sulfur springs can be quite stimulating. People with sensitive skin may experience irritation. Rinse off with fresh water after bathing and apply moisturiser.
Metasilicic Acid and Skin Benefits
Metasilicic acid (SiO₂) is one of the officially recognised therapeutic spring components under Japan's mineral spring analysis guidelines. Springs containing 50 mg/kg or more meet the threshold. It is associated with promoting collagen synthesis, moisturising skin, and softening the stratum corneum. Volcanic regions such as Gunma and Nagano are particularly rich sources.
Three Spring Types Noted for Skin Benefits
- Bicarbonate spring: Cleansing action that removes dead skin cells — known as the "cleansing spring"
- Chloride spring: A salt film on the skin prevents moisture loss, leaving skin silky
- Sulfate spring: Known as the "wound spring" or "beauty spring" — sulfate components aid skin regeneration
References
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