<unk>  describes<unk>  and complementary<unk>  for<unk>  which have not been approved by a governing body (for instance, the United States Food and Drug Administration) as being effective. These<unk>  include chemicals, mixtures, herbs, devices, and manual procedures. They are generally not supported by evidence, either through lack of testing or through lack of statistically significant positive results.<unk> ns have been raised about the safety of certain<unk> .
Such therapies can be categorized broadly into three groups: unproven<unk><unk>  that are offered as a substitute to standard<unk> <unk> <unk><unk>  offered as a complement to standard<unk> <unk> rather than as a substitute; or<unk>  which have been proposed in the past, but which with testing in clinical trials were found not to be efficacious. Some of these obsolete or disproven<unk>  continue to be promoted, sold, and used.
Alternative cancer treatments
Experimental cancer treatment
Suicide medical therapy
Mental disorder medical therapy
Peripheral neuropathy interventions
Radiation injury medical therapy
Altitude sickness medical therapy
Coronary heart disease prevention