Homeopathic Supplements: Why They Cannot Work

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Homeopathy was created in 1796 by a German physician named Samuel Hahnemann. It rests on two ideas:

• "Like cures like." A substance that causes a symptom in a healthy person can cure the same symptom in a sick person.
• The "law of infinitesimals." Diluting a substance over and over makes it more potent, not less.

Both ideas contradict basic chemistry, physics, and pharmacology. The reason homeopathy cannot work is not a matter of opinion. It is a matter of how matter works.

The Dilution Problem

Homeopathic products are sold at "potencies" like 30C or 200C. The "C" stands for centesimal — a 1-in-100 dilution. A 30C product has been diluted 1:100 thirty times in a row. The dilution factor is 10^-60.

How small is 10^-60? Avogadro's number is about 6 × 10²³. That's how many molecules of water are in 18 grams of water (one mole). At 12C, you have already diluted past Avogadro's number, meaning the average dose at 12C contains less than one molecule of the original substance. At 30C the math is staggering: to hold a single molecule of starting substance, you would need a sphere of solvent roughly the size of the Sun. By 200C, you would need a sphere larger than the observable universe.

In other words, a typical 30C homeopathic pill is statistically pure sugar pill or pure water — nothing else.

"Water Memory" Does Not Hold Up

The standard reply to the dilution problem is that water "remembers" the molecules that were once dissolved in it. The idea was published in 1988 in Nature by French immunologist Jacques Benveniste. Nature's editor John Maddox — together with researcher Walter Stewart and stage magician James Randi — visited the Benveniste lab and re-ran the experiments under blinded conditions. The effect disappeared. Their report, "'High-dilution' experiments a delusion," was published in the same journal a few weeks later. (The original paper was not formally retracted, but no other lab has reliably reproduced the effect since.)

"Water memory" has no physical mechanism. Hydrogen bonds in liquid water rearrange in roughly a picosecond — a trillionth of a second. Any "memory" would be erased before it could affect biology.

The Clinical Evidence

The clinical record matches what the physics predicts: homeopathic remedies perform no better than placebo. The most thorough review came from Australia's National Health and Medical Research Council (NHMRC) in 2015. After examining about 1,800 homeopathy studies covering 68 health conditions, the NHMRC concluded there is no good-quality evidence that homeopathy is effective for any of them. Cochrane reviews of individual homeopathic uses (for hay fever, asthma, ADHD, chronic pain, and others) have reached similar conclusions. Apparent benefits in uncontrolled reports are explained by placebo response, regression to the mean (symptoms tend to fade on their own), and the natural course of self-limiting illness.

Where the Real Risk Sits

A sugar pill is harmless. The risk in homeopathy is what a person doesn't take instead. Homeopathic asthma "remedies" used in place of inhalers, homeopathic teething gels (some past products contained variable amounts of belladonna and were the subject of FDA warnings and a recall), and homeopathic alternatives to childhood vaccines have all been linked to harm. The U.S. FDA tightened its enforcement guidance on over-the-counter homeopathic products in 2019–2022, signaling that "homeopathic" labeling does not exempt a product from the same safety standards as other drugs.