Evidence Files

Homeopathy: How a €1.5 Billion European Industry Sells Diluted Water as Medicine

In Germany, homeopathic remedies are sold in every pharmacy. France reimbursed them through its national health system until 2021. The Swiss constitution mentions homeopathy alongside conventional medicine. And every major systematic review of the evidence reaches the same conclusion: it doesn't work.

Published: 20 June 2026

Verdict

TRICK (no evidence)

We searched PubMed and Cochrane Library for clinical evidence supporting homeopathic remedies. The decisive study remains the 2005 Lancet meta-analysis, which matched 110 homeopathy trials against 110 conventional-medicine trials on the same conditions. When the analysis was restricted to the large, higher-quality trials, the conventional treatments kept their effect (odds ratio 0.58) while homeopathy's vanished into statistical noise (0.88, confidence interval 0.65–1.19). The authors' conclusion: the findings are compatible with the notion that the clinical effects of homoeopathy are placebo effects. An overview of the Cochrane reviews reached the same place independently — homeopathic medicines show no effects beyond placebo.

Why Europe loves it

Homeopathy was invented in Germany in 1796 by Samuel Hahnemann. That 230-year head start gave it deep cultural roots across Europe — roots that have proven remarkably resistant to evidence.

In France, homeopathic products were reimbursed by the national health insurance system until 2021, when the government finally cut funding after a scathing review concluded there was no scientific basis for reimbursement. In Germany, homeopathy is still taught in some medical schools and practiced by licensed physicians. In Switzerland, it was added to the national health insurance basket in 2017 — after a decade-long political fight.

The industry is worth over €1.5 billion in Europe alone. It employs skilled lobbyists, funds patient advocacy groups, and benefits from a regulatory loophole: homeopathic products don't need to prove they work to get approved — only that they're safe. Water is safe.

What the science actually says

The core principle of homeopathy is "like cures like" — a substance that causes symptoms in a healthy person can cure those symptoms in a sick one. Remedies are diluted to extreme concentrations: a typical 30C dilution means one part active ingredient in 10⁶⁰ parts water. At that dilution, not a single molecule of the original substance remains. The proposed mechanism — "water memory" — has no physical basis.

The Lancet meta-analysis is the cleanest test ever run. It matched 110 homeopathy trials against 110 conventional-medicine trials on the same conditions — the same analysis applied to both, so any methodological objection would have to apply equally to both
Restricted to the best trials, one effect survived and the other didn't. Among large, higher-quality studies the odds ratio was 0.58 (0.39–0.85) for conventional medicine and 0.88 (0.65–1.19) for homeopathy. The second interval crosses 1 — no effect demonstrated. The authors called the result compatible with homeopathy's effects being placebo effects
Smaller and weaker trials showed bigger effects — in both groups. That is the signature of bias rather than of efficacy, and it is why restricting to the best studies is the meaningful test
The Cochrane reviews independently agree. An overview of them concluded that the available Cochrane reviews do not show homeopathic medicines to have effects beyond placebo
In children specifically, the answer is the same. A systematic review of paediatric trials found the evidence not convincing enough to support a recommendation in any condition
Even reviews written by homeopathy researchers land in the same place. The Cochrane review of Oscillococcinum, the bestselling homeopathic flu remedy, was authored by three researchers all active in the field — and concluded that the evidence is not compelling, with no significant difference from placebo on prevention
And the mechanism problem never goes away. A 30C dilution is one part in 10⁶⁰; the observable universe holds roughly 10⁸⁰ atoms. No molecule of the original substance remains, and "water memory" has no physical basis

What the label claims vs. what research shows

The marketing claim

"Supports the body's natural healing processes." "Proven for over 200 years." "Safe, gentle, and without side effects." "Works with your body, not against it."

What research shows

When the analysis is restricted to large, high-quality trials, the homeopathy effect disappears while the conventional-medicine effect holds. Two hundred years of use is not evidence. Safe only because there is nothing in it — and no mechanism has been proposed that survives the dilution.

Frequently asked questions

Is there really nothing in a homeopathic remedy?

At typical dilutions, no. A 30C preparation is one part in 10⁶⁰, and the observable universe contains roughly 10⁸⁰ atoms — so a single molecule of the original substance surviving is not unlikely but arithmetically impossible. What remains is water, or the sugar pellet it was dropped onto. Proponents propose that water retains a "memory" of the substance; no physical mechanism for this has been demonstrated.

But people say it works for them — how?

Because feeling better after taking something is the normal course of most complaints. People seek help on their worst day, and most conditions improve from there regardless. Add the ritual of a consultation — homeopaths typically spend far longer with patients than GPs do — and the experience of being helped is real even when the pills are inert. This is precisely why placebo-controlled trials exist, and why the best of them show the effect dissolving.

Can it be given to children?

It won't poison them, but the systematic review of paediatric trials found the evidence insufficient to recommend homeopathy for any childhood condition. The real risk is the same one adults face, magnified: treating a child's illness with something inert while an effective treatment goes unused.

If it's harmless, why argue about it?

Two reasons, neither of them about the water. Money, which in Europe runs to over a billion euros a year. And displacement — the documented harms of homeopathy are cases where it replaced or delayed effective treatment, not cases of the remedy itself hurting anyone. A sugar pill is only harmless if nothing else was needed.

How can pharmacies sell it, then?

Because EU registration for homeopathic products requires proof of safety and of established homeopathic use — not proof that the product works. That is a genuinely different standard from the one applied to the medicine on the next shelf, and nothing on the packaging signals the difference to the person buying it.

Our Conclusion

Homeopathy has been tested more fairly than almost any alternative therapy, and the cleanest test is still the 2005 Lancet analysis: the same method applied to 110 homeopathy trials and 110 conventional-medicine trials, and among the best studies in each group, one effect survived and the other didn't. Cochrane reviews reach the same conclusion independently, as does the research on children — and so, strikingly, does the Cochrane review of the bestselling homeopathic flu remedy, written by researchers sympathetic to the field. It is safe in the sense that water is safe. It is not safe in the sense that choosing it instead of effective treatment delays real care, which is where every documented harm from homeopathy actually comes from. If what appeals to you is the gentleness and the unhurried consultation, those are real things worth wanting — and worth asking your doctor for directly, because the part of homeopathy that genuinely helps people is the part that has nothing to do with the pills.

Sources

Every claim in this article rests on a primary publication. Links go to the publisher's site or to PubMed, the US National Library of Medicine database.

This article is for informational purposes only and does not constitute medical advice. Trick or Treatment analyses the presence of clinical studies in open scientific databases — PubMed and Cochrane Library. The absence of studies in these databases does not automatically mean a drug is ineffective, but it does mean its effectiveness has not been confirmed by evidence-based medicine standards. Any treatment decisions should be made together with your doctor.