Is it true that multi vitamines and anti oxidants are not good for ones health?

Depends onthe antiox: There is evidence for benefit for cancer prevention from the physicians's health study with a multivitamin. Usually benefit is due to the presence of b vitamins. There is better evidence that mood can be improved and the negative effects of stress can be diminished with b vitamins. Vitamin c is an antioxidant and protect cells from damage, but in large doses (>1gm) causes oxidative stress.