title: I saw an advertisement for a weight-loss product. When I called the manufacturer to find out what's in it, I was told they couldn't tell me because it's a "proprietary blend." What does that mean?
mesh_terms: D002626:Chemistry, Pharmaceutical / Q000331:legislation & jurisprudence; D019587:Dietary Supplements / Q000032:analysis*; D004348:Drug Labeling / Q000331:legislation & jurisprudence; D006801:Humans; D010330:Patents as Topic; D015431:Weight Loss