Homeopathy or homoeopathy is a pseudoscientific[1] system of alternative medicine. It was conceived in 1796 by the German physician Samuel Hahnemann. Its practitioners, called homeopaths or homeopathic physicians,[2] believe that a substance that causes symptoms of a disease in healthy people can cure similar symptoms in sick people; this doctrine is called similia similibus curentur, or "like cures like".[3] Homeopathic preparations are termed remedies and are made using homeopathic dilution. In this process, the selected substance is repeatedly diluted until the final product is chemically indistinguishable from the diluent. Often not even a single molecule of the original substance can be expected to remain in the product.[4] Between each dilution homeopaths may hit and/or shake the product, claiming this makes the diluent "remember" the original substance after its removal. Practitioners claim that such preparations, upon oral intake, can treat or cure disease.[5]
All relevant scientific knowledge about physics, chemistry, biochemistry and biology contradicts homeopathy.[6] Homeopathic remedies are typically biochemically inert, and have no effect on any known disease.[7][8][9] Its theory of disease, centered around principles Hahnemann termed miasms, is inconsistent with subsequent identification of viruses and bacteria as causes of disease. Clinical trials have been conducted and generally demonstrated no objective effect from homeopathic preparations.[10][11][12]: 206 [13] The fundamental implausibility of homeopathy as well as a lack of demonstrable effectiveness has led to it being characterized within the scientific and medical communities as quackery and fraud.[14][15][16]
Homeopathy achieved its greatest popularity in the 19th century. It was introduced to the United States in 1825, and the first American homeopathic school opened in 1835. Throughout the 19th century, dozens of homeopathic institutions appeared in Europe and the United States. During this period, homeopathy was able to appear relatively successful, as other forms of treatment could be harmful and ineffective. By the end of the century the practice began to wane, with the last exclusively homeopathic medical school in the United States closing in 1920. During the 1970s, homeopathy made a significant comeback, with sales of some homeopathic products increasing tenfold. The trend corresponded with the rise of the New Age movement, and may be in part due to chemophobia, an irrational aversion to synthetic chemicals, and the longer consultation times homeopathic practitioners provided.
In the 21st century, a series of meta-analyses have shown that the therapeutic claims of homeopathy lack scientific justification. As a result, national and international bodies have recommended the withdrawal of government funding for homeopathy in healthcare. National bodies from Australia, the United Kingdom, Switzerland and France, as well as the European Academies' Science Advisory Council and the Russian Academy of Sciences have all concluded that homeopathy is ineffective, and recommended against the practice receiving any further funding.[17][18][19][20] The National Health Service in England no longer provides funding for homeopathic remedies and asked the Department of Health to add homeopathic remedies to the list of forbidden prescription items.[21][22][23] France removed funding in 2021,[24][25] while Spain has also announced moves to ban homeopathy and other pseudotherapies from health centers.[26]
Baran GR, Kiana MF, Samuel SP (2014). "Science, Pseudoscience, and Not Science: How do They Differ?". Healthcare and Biomedical Technology in the 21st Century. Springer. pp. 19–57. doi:10.1007/978-1-4614-8541-4_2. ISBN978-1-4614-8540-7. within the traditional medical community it is considered to be quackery
Ladyman J (2013). "Chapter 3: Towards a Demarcation of Science from Pseudoscience". In Pigliucci M, Boudry M (eds.). Philosophy of Pseudoscience: Reconsidering the Demarcation Problem. University of Chicago Press. pp. 48–49. ISBN978-0-226-05196-3. Yet homeopathy is a paradigmatic example of pseudoscience. It is neither simply bad science nor science fraud, but rather profoundly departs from scientific method and theories while being described as scientific by some of its adherents (often sincerely).
Grimes, D.R. (2012). "Proposed mechanisms for homeopathy are physically impossible". Focus on Alternative and Complementary Therapies. 17 (3): 149–55. doi:10.1111/j.2042-7166.2012.01162.x.
^Baran GR, Kiana MF, Samuel SP (2014). "Science, Pseudoscience, and Not Science: How do They Differ?". Healthcare and Biomedical Technology in the 21st Century. Springer. pp. 19–57. doi:10.1007/978-1-4614-8541-4_2. ISBN978-1-4614-8540-7. within the traditional medical community it is considered to be quackery
^Paul S. Boyer (2001). The Oxford companion to United States history. Oxford University Press. p. 630. ISBN978-0-19-508209-8. Retrieved January 15, 2013. After 1847, when regular doctors organized the American Medical Association (AMA), that body led the war on "quackery", especially targeting dissenting medical groups such as homeopaths, who prescribed infinitesimally small doses of medicine. Ironically, even as the AMA attacked all homeopathy as quackery, educated homeopathic physicians were expelling untrained quacks from their ranks.