Antioxidants help your body use oxygen more efficiently, increasing the oxygen saturation level of blood cells.
Drinking enough of water keeps your lungs hydrated, which improves their ability to absorb oxygen and expel carbon dioxide.
Aerobic exercises, which improve your body's metabolic rate, can also help with breathing problems and increase the oxygen saturation of your blood.
Houseplants have been shown to improve indoor air quality. By eliminating carbon dioxide and restoring oxygen, they increase the amount of oxygen available for your body to ingest.