Videos on social media platforms like TikTok have shown people using lead testing kits on their Stanley cups and other travel flasks, raising concerns about potential lead exposure. The manufacturer of Stanley cups, Pacific Market International, confirmed that there is some lead sealed within the base of their products, but it is covered by a stainless steel layer that protects consumers from lead exposure. However, experts warn that if the bottom seal of the cup comes off, there could be a risk of lead exposure. Other brands of travel drinking cups have also been subject to recalls due to their use of lead. Lead exposure can lead to various health issues, including kidney problems, anemia, reproductive issues, and developmental problems.