Why are advertised remedies and doctors who advertise dangerous?

Why are advertised remedies and doctors who advertise dangerous?

Collection:
Images from the History of Medicine (IHM)
Format:
Still image
Subject(s):
Nonprescription Drugs
Quackery
Public Health
Abstract:
Photoprint of a poster: text with a collage of quack ads.
Copyright:
This item may be under copyright protection. Please ask copyright owner for permission before publishing.
Copyright Information:
American Sexual Health Association; Source: Research; Research date: 20160122
Extent:
1 photoprint.
NLM Unique ID:
101447327 (See catalog record)
NLM Image ID:
A018134
Permanent Link:
http://resource.nlm.nih.gov/101447327