Educational information, not medical advice — ask your doctor or midwife.
Cuprum metallicum is a homeopathic remedy made from metallic copper. Homeopaths give it mainly for cramps, spasms and twitching muscles. It is a single remedy, which means it is made from one starting material only.
The copper is ground up, then diluted again and again, with shaking at each step. At the common 30C strength, essentially no copper is left in the pill. So this is not a copper supplement and it does not add copper to your body.
Controlled trials do not separate this remedy from a dummy pill (placebo). Long use inside a tradition is not proof that a remedy works. Its standing comes from homeopathic practice, not from trial results.
Homeopathy runs on a "like cures like" idea. A substance that causes symptoms in a healthy person is thought to ease similar symptoms when it is heavily diluted. Copper poisoning can cause cramps and spasms, so diluted copper is given for cramping states.
There is no known way a dilution with no copper left in it could act on the body. Makers say the shaking leaves an "imprint" in the water or sugar. Chemistry and physics give no support for that claim.
When studies are blinded and well run, the results match placebo. Any relief people notice is best explained by the problem easing on its own, or by the comfort of doing something.
It comes as small sugar pills, tablets, granules and liquid drops. Common strengths are 6C, 12C, 30C and 200C. Lower decimal strengths such as 3X and 6X are also sold.
The numbers can confuse people. A higher number means more dilution, not more copper. Drops usually contain alcohol, so check the label if you avoid it.
Copper has been used as metal, pigment and medicine for thousands of years. Samuel Hahnemann, who founded homeopathy in Germany, tested copper on healthy volunteers in the early 1800s and wrote up the symptoms it produced. Those notes shaped how homeopaths still use it, mainly for cramp and spasm pictures.
Cuprum has stayed in homeopathic textbooks and kits ever since, which makes it a long-standing staple of that one tradition.
Some reactions to Cuprum metallicum need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Call emergency services now for a fit that lasts more than five minutes, a first-ever fit, one fit after another, trouble breathing, blue lips, or chest pain.
See a doctor the same day if a leg cramp comes with swelling, redness and heat, if you feel weak on one side, or if belly pain is severe.
Book a normal appointment if cramps are new, keep coming back, wake you at night, or follow a new medicine. Also see a doctor if you took a low-strength copper product and now feel sick, have belly pain, dark urine or yellow skin.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Cuprum metallicum is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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