Onsen Quality

Origins

After millennia of geological alchemy, the Earth has bestowed a rare natural wonder — Niseko’s YUKORO ONSEN. Nestled in ancient forests, its waters rise from deep within the Earth’s crust, filtered and mineralized through volcanic strata. The result is an exceptionally pure sodium bicarbonate chloride spring, enriched with optimal mineral balance and powerful micro-algae actives. This unique ecological cycle, forged over ages of geological change, gives YUKORO ONSEN its unparalleled healing power — renowned for promoting cellular renewal and supporting recovery of natural body functions.

Origins

After millennia of geological alchemy, the Earth has bestowed a rare natural wonder — Niseko’s YUKORO ONSEN. Nestled in ancient forests, its waters rise from deep within the Earth’s crust, filtered and mineralized through volcanic strata. The result is an exceptionally pure sodium bicarbonate chloride spring, enriched with optimal mineral balance and powerful micro-algae actives. This unique ecological cycle, forged over ages of geological change, gives YUKORO ONSEN its unparalleled healing power — renowned for promoting cellular renewal and supporting recovery of natural body functions.

Origins

After millennia of geological alchemy, the Earth has bestowed a rare natural wonder — Niseko’s YUKORO ONSEN. Nestled in ancient forests, its waters rise from deep within the Earth’s crust, filtered and mineralized through volcanic strata. The result is an exceptionally pure sodium bicarbonate chloride spring, enriched with optimal mineral balance and powerful micro-algae actives. This unique ecological cycle, forged over ages of geological change, gives YUKORO ONSEN its unparalleled healing power — renowned for promoting cellular renewal and supporting recovery of natural body functions.

micro-algae

The onsen contains a variety of micro-algae, forming a unique ecological cycle. It helps reduce both skin and systemic inflammation, regulates glycation damages and cell function disorders, revitalizes skin cell activity, and slows skin aging.

Micro-Algae

The onsen contains a variety of micro-algae, forming a unique ecological cycle. It helps reduce both skin and systemic inflammation, regulates glycation damages and cell function disorders, revitalizes skin cell activity, and slows skin aging.

Micro-Algae

The onsen contains a variety of micro-algae, forming a unique ecological cycle. It helps reduce both skin and systemic inflammation, regulates glycation damages and cell function disorders, revitalizes skin cell activity, and slows skin aging.

micro-algae

The onsen contains a variety of micro-algae, forming a unique ecological cycle. It helps reduce both skin and systemic inflammation, regulates glycation damages and cell function disorders, revitalizes skin cell activity, and slows skin aging.

Registration information:

September 24, Reiwa 6 (2024);

Registered analysis institution number – Hokkaido No.2;

Hokkaido pharmaceutical association public health inspection center (General incorporated foundation; 6-6, Hiragishi 1-jo 8-chome, Toyohira-ku, Sapporo city, Japan)

Name:

YUKORO ONSEN

Hydrothermal type:

Sodium bicarbonate and chloride type spring

Cations:

Hydrogen ion (H⁺)

Sodium ion (Na⁺): 965.4mg/L; 41.99mval/L

Potassium ion (K⁺): 96.2mg/L; 2.46mval/L

Ammonium ion (NH₄⁺): 2.2mg/L; 0.12mval/L

Magnesium ion (Mg²⁺): 88.2mg/L; 7.26mval/L

Calcium ion (Ca²⁺): 114.4mg/L; 5.71mval/L

Aluminum ion (Al³⁺)

Manganese ion (Mn²⁺): 0.2mg/L; 0.01mval/L

Iron(II) ion (Fe²⁺): 0.9mg/L; 0.03mval/L

Iron(III) ion (Fe³⁺): 9.7mg/L; 0.52mval/L

Anions:

Fluoride ion (F⁻)

Chloride ion (Cl⁻): 1028mg/L; 29mval/L

Hydroxide ion (OH⁻)

Hydrosulfide ion (HS⁻)

Thiosulfate ion (S₂O₃²⁻)

Hydrogen phosphate ion (HPO₄²⁻): 0.1mg/L

Sulfate ion (SO₄²⁻): 112.3mg/L; 2.34mval/L

Bicarbonate ion (HCO₃⁻): 1656mg/L; 27.14mval/L

Carbonate ion (CO₃²⁻): 0.6mg/L; 0.02mval/L

Undissociated species:

Silicic acid (H₂SiO₃): 69.9mg/L; 0.9mmol/L

Metaboric acid (HBO₂): 21.4mg/L; 0.49mmol/L

Temperature:

56.4°C (Ambient: 28.0°C)

pH:

6.68 (Weakly acidic)

Organoleptic evaluation:

Pale yellow hue, slight turbidity, virtually odorless

Indications:

– Neuralgia

– Myalgia

– Arthralgia

– Frozen shoulder

– Motor paralysis

– Joint stiffness

– Contusion

– Sprain

– Chronic gastrointestinal disorder

– Hemorrhoid

– Cold sensitivity

– Convalescence period

– Fatigue recovery

– Health promotion

– Cut

– Burn

– Chronic skin disease

– Frail children

– Chronic gynecological disorder

Contraindications:

– Skin infection

– Severe heart disease

– Severe respiratory disorder

– Heavy drinking