Why hasn't the USA banned certain products and practices that have already been banned in Europe?

I’ve heard a lot about products and practices that have been banned in Europe but not the USA. For example, rBGH (a synthetic growth hormone given to cows that increases the risk of cancer) and energy drinks (proven to increase risk of heart attacks, banned in some European countries). This site lists several dangerous food products banned in Europe but not the USA.

I don’t get it. What’s taking us so long? Why do manufacturers and companies in the USA get the right to produce products that have been proven to be harmful?

If someone could explain this to me, I would be very grateful.