This document discusses quackery, which is the promotion or sale of health products and services that have not been proven safe or effective. Quackery is a form of health fraud. There are three major characteristics of health quackery: 1) it is a big business, 2) it spreads quickly, and 3) it preys on people with illnesses that have no known cure. The document outlines three forms of quackery: medical quackery involving drugless or bloodless cures, nutrition quackery promoting unproven food fads, and device quackery using miraculous gadgets to treat health conditions. People are advised to avoid quackery and consider if claims have been scientifically proven.