Based on testing to date, some of the tumblers may contain a chemical solution that was trapped between the inner walls of the tumbler, which contains some levels of sulfuric and phosphoric acids. This solution may release when the tumbler is filled with liquid, posing a potential risk of serious injury. The interaction between the solution and the tumbler may also result in elevated levels of iron, chromium, and nickel. A range of health effects has been associated with ingestion of these substances, including burning of the lips, tongue, throat, stomach, and/or other tissue damage, and nausea, vomiting, stomach cramps and diarrhea. Health effects associated with skin contact with these substances include blistering, burns, pain, and redness. As of May 23, 2024, Sunscope is aware of 43 reports from consumers who reported experiencing various symptoms, the most common of which were headache, nausea, cramping and/or abdominal pain, and diarrhea.