Recently, there has been significant discussion among the Chinese community on social media regarding hormone-added beef sold at Costco. Many users have expressed concerns that unless the packaging specifies “no added hormone,” the beef is likely treated with hormones. They claim that long-term consumption of such meat can lead to issues like acne and various health problems. Some individuals even reported elevated estrogen levels and ovarian cysts during medical check-ups after consuming this type of beef regularly. To address these concerns, our team from the World Journal decided to investigate the matter at Costco.