In practice, most people use the term to refer to a group of interventions which are designed to stop, or at least reduce, the effect of biomedical problems (such as gastrointestinal abnormalities, immune dysfunctions, detoxification abnormalities, and/or nutritional deficiencies or imbalances).
The supporters of biomedical interventions believe that these biomedical problems act as triggers which cause, or make worse, many of the problems faced by people on the autism spectrum. They believe that those problems can be solved, or at least reduced, by following one or more biomedical interventions.
There is a vast range of biomedical interventions, many of which are considered to be forms of complementary or alternative medicine by most traditional health care practitioners. Biomedical interventions include diets, nutritional supplements and hormones, the “off-label” use of some medications, as well as practices such as chelation and hyperbaric oxygen therapy.
This type of therapy isn’t considered evidence-based or medically necessary and often is not covered by insurance.