Even a professor in Boston did a study about it about 2 years ago and said that sunscreen is bad and causes cancer. He is still working but was removed as head of the dermatology department. Can you imagine what it will do to all these companies that make all that stuff, they don't like these studies.
Several CureZone Forums suggest not to use sunscreen. I never use it, but I make sure that I don't get a sunburn.