What are the side effects of antioxidants?

Antioxidants, while beneficial in neutralizing free radicals, can have side effects when taken in excessive amounts. High doses of certain antioxidants, such as beta-carotene and vitamin E, may increase the risk of certain health issues, including lung cancer in smokers and bleeding disorders, respectively. Additionally, some individuals may experience gastrointestinal upset or allergic reactions. It's important to consult a healthcare professional before starting any antioxidant supplements.