Short answer: copper surfaces inactivate many viruses and bacteria much faster than plastic or stainless steel. This is well documented in lab and hospital research. That is a property of copper surfaces. It does not mean that drinking water from a copper vessel protects you from colds, flu or other infections.
How copper inactivates germs on contact
Scientists call this the oligodynamic effect: certain metals are toxic to microbes even in tiny amounts. Researchers describe several ways copper works on contact:
- Copper ions damage the outer membrane or envelope of bacteria and viruses.
- Copper generates reactive oxygen species that further damage microbes.
- Copper ions disrupt the genetic material (DNA or RNA) microbes need to reproduce.
See this summary of copper's germ-killing mechanisms.
What the research found
- Surfaces: in lab tests, the virus that causes COVID-19 lost its ability to infect within about 4 hours on copper, compared with up to about 72 hours on plastic.
- Hospitals: a study published on NCBI looked at outbreaks in healthcare settings and found some outbreak types were less common in areas fitted with copper surfaces. This is one reason hospitals are adding copper to high-touch surfaces.
- Stored water: laboratory research found that storing water in copper reduced bacteria such as E. coli.
What this means for copper water
A copper vessel helps keep the water inside it fresh by reducing some bacteria. That is a real, useful property, and it is part of why storing water in copper has been an Ayurvedic tradition for centuries.
But viruses like colds and flu spread person to person through the air and on hands and surfaces. Drinking copper water has not been shown to prevent or treat these infections, boost immunity or reduce "viral load". For protection, the proven measures still apply: hand washing, vaccination where recommended, and staying home when sick.
Ways to use copper at home
- Copper water bottles and pitchers for storing drinking water. See our copper water bottles and copper water vessels.
- Copper sinks, whose surface naturally reduces bacteria between cleanings. They still need regular cleaning.
Frequently asked questions
Does copper kill viruses?
Copper surfaces inactivate many viruses within hours in lab conditions. The effect is on surfaces and in stored water, not inside your body.
Does drinking copper water prevent colds or flu?
No. There is no evidence that drinking copper water prevents or treats colds, flu or COVID-19.
Does a copper bottle keep water cleaner?
Research shows copper reduces some bacteria in stored water. Start with safe drinking water and clean the bottle regularly.
Shop handmade copper at Kaarigar Handicrafts, made by our own artisans in India.