what is quackery?
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The word "quackery" derives from the word quacksalve, a word that is defined as "someone who boasts about his salves". According to the Collins English Dictionary the modern day definition of a quack is "a pretender to medical or other skill". The Federal Drug Administration (FDA) defines quackery as "the promotion, for profit, of a medical remedy known to be false or unproven."

Quackery may not be a conscious intent to mislead on the part of the product seller. They may truly believe in their product. Rather than consciously creating a demand for their product they may be merely taking advantage of demand created by here say and rumor spread by other well intentioned individuals.

Semi-quackery can occur. Legitimate doctors and other health care professionals may give valid and accurate advice for most of the time. Yet they may occasionally indulge in quackery claims for a product, especially if they themselves gain material profit or perceive an increase in their fame.

In science their needs to be a certain amount of research data to support any medical claim. If a claim is made that a product can regrow hair then there should be solid evidence from properly designed scientific studies to back the claim. A product that does not have such data is not necessarily a quack product. Unproven products can be described as experimental, yet to be proven valid with further research. However, no agent should consciously claim a medical benefit for a product that is being sold to the general public unless and until there is substantial supporting scientific evidence for any health claim.