How does it work?

When showering with Nagayu, the CO2 penetrate through the skin and enters into the blood-vessels.
This action causes the blood-vessels to expand and increase the blood flow;
it also changes the blood pH level and allows more oxygen released from hemoglobin for cell to absorb.
This biochemical reaction is referred as “Bohr Effect”. – Wikipedia: https://en.wikipedia.org/wiki/Bohr_effect