Users claim to feel more energized, less stressed and more productive after inhaling the oxygen. But there is no solid, scientific evidence to date that supports the idea that healthy people can improve vitality by inhaling oxygen. Any burst of energy attributed to inhaling an enriched oxygen mixture is unlikely to last for more than a few minutes. The lungs can only transfer a limited amount of an enriched oxygen mixture to the blood and the rest is simply exhaled. Too much oxygen, in fact, can cause severe problems.
Excessive oxygen can hinder brain, heart, lung, muscle and memory function.
Too much oxygen increases production of oxygen radicals, which can damage tissue and kill cells. Until there is a controlled medical trial with objective measurements, there is no solid evidence to support any beneficial claims. My belief is that if a controlled study were to be conducted, with normal healthy volunteers, there will be no substantial difference between people breathing room air and pure oxygen. Meditation, which focuses on breathing and muscle relaxation, also may be beneficial for relieving stress. A patient should consult his or her personal physician before changing or considering any medical treatments.