Today, many people use complementary health approaches for a variety of diseases or conditions. But what exactly are these approaches, and how do they differ from standard medical care? Complementary health approaches are medical and health care systems, practices, and products that originated outside of mainstream medicine. They include techniques performed by a practitioner (such as acupuncture, spinal manipulation, and massage therapy) and natural products (such as herbs, probiotics, and fish oil). Some approaches, including acupuncture and yoga, originated in Eastern countries such as China or India but are now used in Western countries as well. Little research has been done on many complementary health approaches. Read more about the National Institute of Health's plan to sponsor research on these approaches.