Following is a very informative article on Qigong, by Ken Cohen:

“Qigong is practiced by more than 80 million Chinese people and probably by tens of thousands in the United States and Europe. Qigong has been rigorously tested in controlled scientific experiments and clinical trials and is often used as an adjunct to conventional allopathic medical treatment. Hypertensive patients who take medication and practice qigong fare better than controls who only take the medication. Similarly, there is solid evidence that qigong can improve immune function and mental health, and prevent disabilities that come with age. Qigong acts like Vitamin C, increasing the activity of an enzyme that helps to deactivate free radicals, highly reactive chemicals that promote tissue degeneration and loss of memory.”

The complete article