Which metal glass is actually healthier to drink from?

Copper has long been praised for its purifying power. When water rests in a copper glass for a few hours, trace amounts of copper ions mix into it, according to a study published in Biomedicine. This process is called oligodynamic effect, and it helps kill harmful bacteria naturally.

Drinking this water can support digestion, balance thyroid function, and detoxify the liver. Some studies even suggest copper may help regulate melanin production, improving skin tone and preventing premature greying.
However, moderation is key. Overexposure to copper can cause nausea or fatigue, as per NIH. Using a copper glass once or twice a day, especially early morning, is generally considered safe and beneficial.