Nagayu Q&A.

CO2 hydrotherapy is a carbonated bathing or rinsing ritual created when sodium bicarbonate and citric acid react with water. As a Nagayu tablet dissolves, it releases carbon dioxide and turns ordinary water into a gentle carbonated spa rinse.

Nagayu is designed to support a deeper-feeling cleanse, a softer moisturized skin or coat finish, and a refreshed post-bath feeling. Many users choose CO2 hydrotherapy as a wellness ritual for daily skin comfort, coat care, and relaxation.

Nagayu is not a medical treatment, but it can be used as a gentle care routine for skin that appears dry, sensitive, or uncomfortable.

When used as a rinse or soak, dissolved CO2 comes into contact with the skin and is often discussed in carbonated bathing culture for its relationship with warmth, circulation, and oxygen delivery.

One scientific concept often referenced is the Bohr effect: changes in CO2 and pH can influence how hemoglobin releases oxygen to tissue. Learn more about the Bohr effect.

There are four common ways to use Nagayu, each with a different purpose.

• Bathing: Use 3 to 4 tablets in a bathtub, depending on water volume. Longer soaking gives the carbonated water more contact time and is best for recovery-minded bathing rituals.
• Showering: The most recommended method. Place one tablet into a compatible Nagayu shower head and use it as the final rinse. One tablet lasts about five minutes on average. Spend extra time on areas that need more care.
• Wiping: Dissolve one tablet in about one liter of water. After bubbling has settled, soak a towel and gently wipe the skin or coat for daily care.
• Spray: Dissolve one tablet in water, wait until active bubbling has settled, then pour into a spray bottle and mist targeted areas for daily skin or coat care. Do not cap a bottle tightly while the tablet is still actively bubbling.

The pH level created by a Nagayu CO2 tablet is typically around 6.5 to 7.5, depending on the water used. This mildly neutral range is generally gentle for skin and coat care, with a lower chance of feeling harsh than more acidic or alkaline formulas.

Yes. Nagayu can be used as part of a gentle ear-cleaning rinse, helping loosen and wash away visible dirt more effectively than plain water. Use a soft flow during the shower, then make sure the ears are dried thoroughly with a towel and warm air so moisture does not remain inside.

Frequency depends on the dog's condition and sensitivity. For more noticeable discomfort, some groomers use a Nagayu rinse every three days without shampoo between regular baths. Avoid use on open wounds, infection, or actively irritated areas, and consult a veterinarian for persistent symptoms.

The coconut oil formula is designed for dogs with very dry skin or coat, offering a richer moisturized finish. The lactic acid formula is designed for higher CO2 volume and a stronger carbonated rinse feel, making it more focused on recovery-style care and refreshed skin-and-coat comfort.