Here’s how oxygen works in the human body (reference chart on right):
Source: Boosting Your Energy, a Special Health Report from Harvard Medical School, 2005
A persistent feeling of fatigue is one of the most common health concerns in this country, accounting for 10 to 15 million doctor visits per year.
77% cite “lack of energy” as the top health concern.
At cruising altitude, airline cabins have lower-than-normal air pressure and oxygen levels. Blood oxygen saturation during commercial flights can be 5%–10% lower than normal.