More Americans are turning to alternative medicine, some when they feel traditional medicine has failed them.

That includes patients like Anna Sterud. After a two-year battle with ovarian cancer, including surgery, chemotherapy and a clinical trial, she decided to try vitamin C infusions.

"I'm very much for scientifically proven methods of treatment, but when you feel your time is starting to run out, you feel you just have to go 100 percent and look for alternatives and that is what I did."

With more Americans turning to alternatives, the U.S. government founded The National Center for Complementary and Alternative Medicine as part of the National Institutes of Health.

"Our job here at the National Institutes of Health is to bring really good science to these really interesting practices," says Dr. Josephine Briggs, the center's director.

Practices that are considered outside mainstream medicine, like the use of dietary supplements, meditation and yoga, as well as chiropractic adjustments, acupuncture, reiki - or therapeutic touch - and massage. A survey by the NIH in 2007 indicated four in 10 Americans use one of these practices, most often to treat pain.

Anna Sterud is using both traditional and alternative medicine to fight cancer.

"I think that the extent to which Americans are interested in these practices is a good reason for them being studied," says Briggs. "We do do our best to provide reliable information on our website about methods. That material is carefully reviewed by peers and scientific experts."