Dietary Supplements Hydroxycut or Mega-T Green Tea?

I'm just wondering if anyone knows anything about Mega-T Dietary Supplements or Hydroxycut weight loss formula. I would like something that is not bad for you, and I am not going to take them until I know more about them. What are the side effects, do they really work? What ingredients in them are bad for you? If anyone could give me a website or some good information on them I would really appreciate that. Thanks again!