Are Copper Cups Safe to Drink From? Risks and Safety Tips
Drinking from a copper cup is generally safe for most healthy people when done mindfully, according to Jamie Alan, PhD, an associate professor of pharmacology and toxicology at Michigan State University. Risks of copper toxicity are rare but may increase if users drink from unlined copper vessels all day, every day, or use them for hot and acidic beverages.
Copper toxicity can cause liver damage and gastrointestinal symptoms, including nausea, vomiting, diarrhea, cramps, and abdominal pain, according to Dr. Alan. While these risks are low for most, individuals with preexisting organ damage or a rare condition called Wilson’s disease should exercise caution.
How do copper cups affect health?
The human body requires trace amounts of copper, but excessive intake can lead to health issues. Dr. Alan notes that while enthusiasts claim these vessels boost immunity, support digestion, and enhance iron absorption, there isn’t robust human data to support these specific effects.
Because copper is abundant in whole foods like grains, seeds, and nuts, true copper deficiency is rare. Dr. Alan states that because only trace amounts are absorbed from the cups, they likely have few effects on the body.
What causes copper to leach into drinks?
Heat and acidity trigger the leaching of copper into beverages. Dr. Alan warns that unlined copper cups should never hold hot liquids or acidic drinks, such as citrus juices or kombucha.
Leaving water in a copper cup for extended periods can also cause excess minerals to accumulate. This leaching can alter the flavor of the drink, which Dr. Alan describes as tasting “like pennies.”
How can you use copper mugs safely?
Dr. Alan recommends choosing cups labeled “food grade” to ensure they are safe for direct contact with food and drinks. For beverages other than room-temperature water, she suggests using lined cups.
Many Moscow Mule mugs are lined with tin, nickel, or stainless steel to prevent leaching. One small study indicates that copper levels in such drinks typically only become concerning after 27 minutes, with ginger beer contributing to the leaching process.
Maintenance is also critical for safety. Dr. Alan explains that copper mugs must be washed by hand, as dishwashers could accidentally dislodge copper and increase the risk of unsafe copper levels.
What are the origins of copper vessels?
Copper vessels, known as tamra jal, are rooted in ayurveda, a traditional Indian medicine system. In this practice, pure water is considered vital for a healthy life, and copper is recommended for storing and purifying water.
While copper’s antimicrobial properties can help purify water, Dr. Alan points out that U.S. tap water is heavily regulated and monitored. Consequently, additional filtering via copper vessels is likely unnecessary for most American consumers.
What may happen if copper use continues?
If users continue to use unlined copper cups for acidic or hot drinks daily, they may increase their exposure to the mineral. This could potentially lead to the aforementioned stomach symptoms or liver damage in susceptible individuals.
Consumers who are unsure about their health status may likely seek guidance from healthcare providers before making a copper vessel their primary drinking cup.
Frequently Asked Questions
Can I use a copper cup for iced coffee?
No. Dr. Alan states this is not a cup to sip iced coffee out of all day.
Who should avoid drinking from copper?
People with Wilson’s disease or those with preexisting organ damage should be cautious, though occasional use may still be acceptable.
Are all copper mugs the same?
No. Some are unlined, while others are lined with stainless steel, nickel, or tin to prevent copper from leaching into the drink.
Do you prefer using traditional materials like copper or stainless steel for your daily drinks?