Another name for life refers to oxygen. We can't even think without it. To survive we need a proper flow of oxygen from the lungs to the body. Sometimes the amount of oxygen flow is reduced in the body. There are several health issues that can lead the oxygen level to drop such as asthma, lung diseases, COPD chronic obstructive pulmonary disease, covid 19, and flu.
When this kind of issue occurs people suffer from a loss of oxygen or what we call a fall of oxygen flow in the body which is cured b giving oxygen supply known as oxygen therapy done with an oxygen concentrator. It is medical support to be sold and used only by a proper prescription. We cant use an oxygen concentrator at home as it will do more harm to our body unless it is prescribed for a need.
Although oxygen makes up about 21% of the air around us, breathing high oxygen is not a good decision to do with your body.