Snake oil is a term used to describe deceptive marketing, health care fraud, or a scam. Similarly, "snake oil salesman" is a common expression used to describe someone who sells, promotes, or is a general proponent of some valueless or fraudulent cure, remedy, or solution. The term comes from the "snake oil" that used to be sold as a cure-all elixir for many kinds of physiological problems. Many 19th-century United States and 18th-century European entrepreneurs advertised and sold mineral oil (often mixed with various active and inactive household herbs, spices, drugs, and compounds, but containing no snake-derived substances whatsoever) as "snake oil liniment", making claims about its efficacy as a panacea. Patent medicines that claimed to be a panacea were extremely common from the 18th century until the 20th, particularly among vendors masking addictive drugs such as cocaine, amphetamine, alcohol, and opium-based concoctions or elixirs, to be sold at medicine shows as medication or products promoting health. History Oil from Chinese water snakes has for centuries been used in Chinese traditional medicine to treat joint pain such as arthritis and bursitis. It has been suggested that the use of snake oil in the United States may have originated with Chinese railway laborers in the mid-19th century, who worked long days of physical toil. Chinese snake oil may have had real benefits due to its high concentration of the omega−3 fatty acid eicosapentaenoic acid (EPA)—more than that of salmon; the rattlesnake oil later sold by charlatans did not contain a significant amount of omega−3. In a modern study, erabu sea-snake oil was found to significantly improve the ability of mice to learn mazes, and their swimming endurance, over mice fed lard. Patent medicines originated in England, where a patent was granted to Richard Stoughton's elixir in 1712. There were no federal regulations in the United States concerning the safety and effectiveness of drugs until the 1906 Pure Food and Drug Act. Thus, the widespread marketing and availability of dubiously advertised patent medicines without known properties or origin persisted in the US for a much greater number of years than in Europe. In 18th-century Europe, especially in the UK, viper oil had been commonly recommended for many afflictions, including the ones for which oil from the rattlesnake (pit viper), a type of viper native to America, was subsequently favored to treat rheumatism and skin diseases. Though there are accounts of oil obtained