Your body is designed to function on 21% oxygen in the air you breathe. Polluted or stale air usually contains less than 21% oxygen, which can impede optimal functioning of your cells. Most importantly, your brain cells are the first affected, resulting in impaired reaction time and judgment. For natural energy and recovery, active, wellness-minded people who work and play hard breathe Oxygen Plus to restore depleted oxygen levels to optimal levels. Since it is difficult to monitor atmospheric oxygen, we suggest trying a few quick breaths of gO2 therapy, 99% Pure Oxygen, 100% Pure Life to help you feel mentally sharper, more alert and energetic.