Assess the likelihood of danger. A good way to assess a treatment is to consider its potential to cause harm. Breathing exercises are much less likely to cause damage than an intravenous therapy.
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Watch out for vague language. If products or therapies are marketed with unspecific promises that they will "promote" or "support" health of a body part, this is a sure sign the claims are not FDA-approved and could be weak on evidence.
Watch out for overblown claims. If an alternative treatment sounds too good to be true -- offers a cure for cancer or Type 1 diabetes, for example -- then it probably is.
Are they experts? Watch out for professionals claiming to treat conditions outside of their field of expertise -- say, a chiropractor offering treatment for (again) diabetes.
Seek licensed professionals. They're more likely to know what they're doing. National associations provide names of licensed professionals in every area. Many states also have societies, such as the California Naturopathic Doctors Assn, www.calnd.org, that can send you in the right direction.