A simple thermal spring drawn from 800 m below Osaka's Taisho ward, emerging at 37.4 °C. It is weakly alkaline (pH 7.9), soft on the skin and gentle in character, sitting in Japan's beauty-water family. The posted indications cover nerve pain, muscle ache, joint pain, poor circulation and recovery from fatigue.
Good for
Smooth skin
Bicarbonate and alkalinity gently lift dead keratin while silica hydrates, leaving skin smooth. This is the basis of the beautifying-water (bijin-no-yu 美人の湯) reputation.
dry, rough skin
Recovery
Warmth and buoyancy lower stress markers and improve sleep; habitual bathing is linked to lower rates of depression.
fatigue, stress
Take care
The analysis date is not recorded on our copy of the certificate.
This list uses the wording the Ministry of the Environment replaced in 2014, so it may not match a current certificate. Items marked † were removed from the official list of contraindications then, or include a condition that was. If you have a health condition, ask a doctor before bathing.
- acute illness (especially when accompanied by fever)
- active tuberculosis
- malignant tumors
- severe heart disease
- respiratory failure
- renal failure
- hemorrhagic diseases
- severe anemia
- other generally progressing illnesses
- pregnancy (especially early and late stages) (dropped from the official list in 2014)
Measured at the source
On the certificate
The analysis date is not recorded on our copy of the certificate.
This list uses the wording the Ministry of the Environment replaced in 2014, so it may not match a current certificate.
- neuralgia
- muscle pain
- joint pain
- frozen shoulder
- motor paralysis
- joint stiffness
- bruises
- sprains
- chronic digestive disorders
- hemorrhoids
- sensitivity to cold
Evidence
- Maeda M. 温泉の医学的効果とその科学的根拠. J. Hot Spring Science 70:197–207, 2021.
- Naito Y et al. A Hot-Spring Water Improves Inflammatory Conditions in an Atopic Dermatitis Model. Biomedicines 13(11):2707, 2025.
- Li H et al. Bicarbonate Ionized Water Bathing Enhances Natural Killer Cell Activity. Scientific Reports 14:51851, 2024.
- Takeda M et al. Hot spring bathing practices have a positive effect on mental health in Japan. Heliyon 9(9):e19631, 2023.