If you pay attention to science journalism, you’ve probably heard tell that antioxidant supplements have mostly negative effects on health markers, ranging from impaired training adaptations in response to exercise, extreme hypoglycemia, and even cancer. At their best, these reports say, antioxidants are merely useless and totally ineffective.
So, is this true? Are antioxidants harmful? Are they effective?
Let’s examine some of the specific claims made about antioxidant supplements.