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Kusatsu Hot Springs were known as a resort for centuries, becoming popular for its health benefits in the late 19th century by Erwin von Baelz, a German doctor who taught medicine at Tokyo University and co-founded modern western medicine in Japan.
Blessed with the highest volumes of mineral rich waters in Japan, Kusatsu Onsen (Japanese word for hot springs) provides 13 public baths including free baths for local residents. One of Japan’s most acidic hot springs, Kusatsu Onsen kills almost all bacteria and microorganisms and has superior antibacterial power.
Located 120 miles northwest of Tokyo, Kusatsu is a small town nestled in mountains with great natural vistas and features. A hotel, restaurant and other amenities provide services for travelers.
Mineral Content of Kusastsu Hot Springs (milligrams per liter)
- Sodium (Na) 96 Works with potassium in regulating fluid exchange in an out of cells. Sodium leads to proper water balance throughout the body.
- Potassium (K) 25.2 Helps balance out the negative effects of salt in the body, which can help lower blood pressure and reduce the risk of heart disease.
- Calcium (Ca) 50.7 Calcium is essential for muscle function and helps strengthen bones. Also enhances blood circulation and relaxation.
- Magnesium (Mg) 49.1 Helps maintain proper blood volume, blood pressure and pH of body’s fluid system.
- Iron (Fe) .54.6 Alleviates symptoms of anemia, an iron deficiency.
- Aluminum (Al) 8.4 Small amounts of aluminum are considered a natural part of a healthy diet, growing in foods and other plants.
- Chloride (Cl) 126 Helps maintain proper blood volume, blood pressure and pH of body’s fluid system.
- Sulphate (SO4) 721 Reduces stress and increases production of endorphins, promotes sleep and stimulates immune system.
- Silicate (SiO2) 88.2 Naturally detoxes and softens rough or dry skin. Helps persisting skin conditions like psoriasis, acne and eczema.
- Hydrogen Sulphide (H2S) 98.6 Anti-inflammatory benefits.
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Example of a hot tub with
the Blue Lagoon Hot Spring