The History of Homeopathy: Where It Originated, How It Spread, and Why It Persists

Key takeaways

• One man, one lifetime. Homeopathy was invented by Samuel Hahnemann (1755–1843) in Germany, published in 1796, and systematised in the Organon of 1810.
• Its early success was largely the success of doing less harm. In an era of bloodletting and mercury, the gentle option often looked better by comparison.
• The decline had three causes at once. Chemistry made the dilution arithmetic a problem, trial methods matured, and the 1910 Flexner Report closed the schools.
• It persists because it was written into law and into habit. US products are regulated as drugs under the 1938 Act, and an estimated 5 million American adults used homeopathy in 2012.

Understanding where a practice comes from is the fastest way to understand what it actually is. Homeopathy's history is genuinely interesting, and it explains most of its vocabulary, its conventions, and its arguments. This is the short version, with dates that can be checked and without the mythology.

Who invented homeopathy, and when?

Samuel Hahnemann, a German physician, between 1796 and 1810. He was born on 10 April 1755 in Meissen, qualified in medicine at Erlangen in 1779, and had grown disgusted with the mainstream medicine of his era, which deserved it. "Heroic medicine" meant aggressive bloodletting, violent purgatives and toxic mercury compounds. Doing that less was, for a while, genuinely safer than doing it more.

His founding observation came from a self-experiment with cinchona bark, the source of quinine and the malaria medicine of the day: he reported that it produced malaria-like symptoms in a healthy person. From that single observation he generalised a principle, which he published in 1796 and named in the 1810 Organon: similia similibus curentur, Hahnemann's claim that a substance producing certain symptoms in the healthy could be matched to similar symptoms in the sick. Whether that claim holds is the subject of our guide to homeopathy and the evidence; this guide is about where it came from.

Dates from the National Library of Medicine's PubMed Central archive, the NCCIH and the FDA; see the sources at the end.

Where did homeopathy originate?

In Germany, specifically Saxony, in the 1790s. Hahnemann's first essay appeared in 1796 in the journal of Christoph Wilhelm Hufeland, one of the most respected physicians in Germany at the time, which gave the idea a serious hearing it might not otherwise have had. The Latin remedy names still used on labels are a fossil of that origin: Latin was the shared scientific language of Hahnemann's world, and the potency conventions printed beside them are his second principle, graduated dilution with succussion, unchanged in form since the Organon.

What did Hahnemann actually claim?

Two things, and it is worth keeping them separate. First, the principle of similars described above. Second, that a substance diluted and shaken in graduated steps kept a kind of activity even when almost none of it remained; he coined the vocabulary of "provings", the symptom trials on healthy volunteers that built the remedy literature. He also, and this is the part the tradition inherited most usefully, insisted on the long structured interview: observe the patient closely, record everything, and do no harm. The guide to how a homeopath takes a case is a direct descendant of that insistence.

Why did it spread so fast in the 1800s?

Because the comparison flattered it. Homeopathy spread through Europe and America within Hahnemann's lifetime; by his death in 1843 it was practised in every European country except Norway and Sweden, and in the United States, Mexico, Cuba and Russia. In the US it arrived in 1825, founded the country's first national medical society in 1844, and by 1900 had 22 medical colleges and 29 journals. Its reputation in the cholera and typhoid epidemics illustrates the honest mechanics of its appeal: when the alternative was bloodletting and purging, the patients of gentle-intervention doctors often fared visibly better. Homeopathy's early success was real, and much of it was the success of not doing harm in an era when standard care actively did.

Why did homeopathy decline?

Three things happened at once in the early twentieth century. As chemistry matured, the dilution arithmetic became an obvious problem: beyond about 12C, no molecule of the starting substance is likely to remain, a point the potency guide sets out plainly. As trial methodology matured, the claims fared poorly under controlled conditions. And as conventional medicine became genuinely useful, the comparison that had flattered homeopathy reversed. The 1910 Flexner Report then rated American medical schools by their laboratory science; of the 22 homeopathic colleges operating in 1900, only two still taught homeopathy in 1923, and by 1950 there was not one, with an estimated hundred practising homeopaths left in the country, nearly all over fifty.

Why does homeopathy persist today?

Because it was written into law, and because its habits outlived its institutions. In the United States, homeopathic products are regulated as drugs under the Federal Food, Drug, and Cosmetic Act of 1938, whose sponsor, Senator Royal Copeland, was himself a homeopathic physician. That is why remedies occupy a regulated-but-contested niche on pharmacy shelves: no homeopathic product has been approved by the FDA for any use, and since 6 December 2022 the agency has applied a risk-based enforcement approach to products marketed without approval. Outside the US the practice never shrank as far; it remains widely practised in India and parts of Europe, and its case-taking tradition continued developing throughout the years the American schools were closing.

What the potted histories leave out

Two things the one-paragraph versions skip:

• The controlled trial was first used against homeopathy. The 1835 Nuremberg salt test, in which a homeopathic preparation was compared with plain water under blinded conditions, is described in the medical literature as an early ancestor of the randomised double-blind trial. The method that later undermined homeopathy's claims was sharpened on them.
• Homeopathy's organisational firsts belong to American medicine generally. The American Institute of Homeopathy (1844) predates the American Medical Association (1846), and one of the AMA's early stated purposes was to oppose it. The professional structures of US medicine were shaped partly by that rivalry.

What does the history mean for a reader now?

Two inheritances, worth keeping straight. The contested one is the remedy system and its claims, where we point you to the evidence guide and let you decide informed. The durable one is a two-century discipline of listening: the long structured interview, attention to what makes symptoms better or worse, to what arrives alongside them, to the whole person rather than the complaint's name. Hahnemann's insistence on observing patients closely and doing no harm was the best of his rebellion, and it is the part of the inheritance this site is built on. That discipline is teachable: bring a live situation to the acute intake and you will see the structure firsthand.

Sources

• Bellavite P. et al., Immunology and Homeopathy. 1. Historical Background (2005), PubMed Central — birth, 1796 essay, 1843, 1844, 1846, 1910, college numbers.
• Schmidt J. M., Similia Similibus Curentur: Theory, History, and Status (2021), PubMed Central — 1810 Organon and its editions.
• Ernst E., Against all odds—the persistent popularity of homeopathy (2020), PubMed Central — cinchona experiment; cites Stolberg on the 1835 Nuremberg salt test.
• Ng J. Y. et al., The Brief History of Complementary, Alternative, and Integrative Medicine Terminology (2023), PubMed Central — 1825 arrival in the United States.
• NCCIH, Homeopathy: What You Need To Know — 2012 use figures, regulation, 1988 and 2019 policy.
• FDA, Homeopathic Products — no approved products, December 2022 guidance.
• FDA, Milestones in U.S. Food and Drug Law — 1938 Act.

This guide is educational only and is not medical advice or a personalized remedy recommendation. Acute symptoms can become urgent; when in doubt, seek professional evaluation.