Skip to main content

The benefits of onsen or hot springs stem from the different mineral and element compositions of the water. Depending on what benefit you’re pursuing, here are the most common minerals and elements found in onsen water throughout Japan and their effects on the body, including specific regions of Japan where certain minerals and elements are known for.

 

  • Sulfur (S)

Sulfur is one of the most common minerals found in onsen water and it is often associated with the distinct smell of hot springs. Sulfur has antibacterial and anti-inflammatory properties and is believed to be effective in treating skin conditions such as psoriasis, eczema, and acne. It can also help to detoxify the body and has a relaxing effect on the mind and body. Sulfur-rich hot springs are found in many regions of Japan, including Beppu and Kusatsu.

 

  • Calcium (Ca)

Calcium is an essential mineral for maintaining healthy bones and teeth. It also plays a role in muscle function and nerve transmission. Calcium-rich hot springs are found in many regions of Japan, including Kusatsu and Hakone. Soaking in a calcium-rich onsen can help to soothe muscle soreness and promote relaxation.

 

  • Magnesium (Mg)

Magnesium is a key element that must be present for normal muscle and neuron function, as well as for bone health. Moreover, it contributes to the control of blood sugar and blood pressure levels in the body. There are magnesium-rich hot springs all around Japan, notably in the cities of Kusatsu and Arima, for example. You may find relaxation and a reduction in stress by soaking in an onsen that is high in magnesium.

 

  • Sodium (Na)

 

Sodium is an electrolyte that plays a role in maintaining the body’s fluid equilibrium. In addition to this, it is essential for healthy nerve and muscle function. Hot springs that are high in sodium may be found in a number of locations in Japan, including Beppu and Arima. Taking a dip in an onsen that is high in salt may assist to reduce inflammation and soreness in the muscles.

 

  • Potassium (K)

Potassium is another electrolyte that plays a role in maintaining the body’s fluid equilibrium. As well as being essential to the operation of muscles and nerves, it plays an important role in the upkeep of proper blood pressure levels. There are several locations in Japan, such as Beppu and Arima, that are home to potassium-rich hot springs. Taking a dip in an onsen that is high in potassium may help reduce tension and promote relaxation.

 

  • Hydrogen carbonate (HCO3)

Hydrogen carbonate is a natural buffer that helps to maintain the pH balance of the body. It can help to soothe skin irritation and reduce inflammation. Hydrogen carbonate-rich hot springs are found in many regions of Japan, including Kusatsu and Hakone.

 

  • Chloride (Cl)

Chloride is an electrolyte that helps to regulate fluid balance in the body. It also plays a role in digestion and metabolism. Chloride-rich hot springs are found in many regions of Japan, including Beppu and Gero. Soaking in a chloride-rich onsen can help to soothe muscle soreness and reduce inflammation.

 

  • Iron (Fe)

Iron is essential for the formation of red blood cells and helps to transport oxygen throughout the body. It can help to reduce fatigue and improve energy levels. Iron-rich hot springs are found in many regions of Japan, including Kusatsu and Yamanouchi.

 

  • Silica (SiO2)

Silica is a natural mineral that helps to strengthen connective tissues such as skin, hair, and nails. It can also help to reduce inflammation and promote wound healing. Silica-rich hot springs are found in many regions of Japan, including Kusatsu and Gero.

 

  • Carbon dioxide (CO2)

Carbon dioxide can help to improve blood flow and oxygen delivery to the body’s tissues. It can also help to reduce stress and promote relaxation. Carbon dioxide-rich hot springs are found in many regions of Japan, including Kirishima and Ibusuki.

 

  • Radon (Rn)

Radon is a naturally occurring radioactive gas that is found in some onsen water. It is believed to have therapeutic effects on certain conditions, such as arthritis and rheumatism. Radon-rich hot springs are found in many regions of Japan, including Misasa and Tamagawa.

 

  • Hydrogen sulfide (H2S)

Hydrogen sulfide is a gas that has a distinct odor similar to rotten eggs. It is found in some onsen water and is believed to have therapeutic effects on certain conditions, such as respiratory problems and skin conditions. Hydrogen sulfide-rich hot springs are found in many regions of Japan, including Beppu and Kusatsu.

 

  • Bicarbonate (HCO3-)

Bicarbonate is an alkaline mineral that helps to maintain the pH balance of the body. It can help to soothe skin irritation and reduce inflammation. Bicarbonate-rich hot springs are found in many regions of Japan, including Kusatsu and Arima.

 

  • Fluoride (F)

Fluoride is a mineral that is important for maintaining healthy teeth and bones. It can help to prevent tooth decay and strengthen bones. Fluoride-rich hot springs are found in many regions of Japan, including Kusatsu and Yugawara.

 

  • Lithium (Li)

Lithium is a mineral that is believed to have mood-stabilizing effects. It can help to reduce stress and anxiety and improve mental health. Lithium-rich hot springs are found in many regions of Japan, including Tamagawa and Yugawara.