A Swiss study that found five of these chemicals in commonly used sunscreens:

Swiss study that found five of these chemicals in commonly used sunscreens:

Octyl-dimethyl-PABA (OD-PABA)

Benzophenone-3 (Bp-3)

Homosalate (HMS)

Octyl-methoxycinnamate (OMC)

4-methyl-benzylidene camphor (4-MBC)

In laboratory testing, each one of these chemicals behaves like estrogen. And when they are combined, they can have a synergistic effect. In other words, two "weak" xenoestrogens can produce a very strong response.

Not only does this disrupt the hormonal system, but these chemicals are known to stimulate tumor growth and the spread of cancer. (Not to mention a decline in male sperm count, early puberty, and feminine characteristics in men.)

And don't think you're safe just because you don't "ingest" these chemicals. Clinical studies show that they easily penetrate the skin and enter the bloodstream.

Whenever possible, you should avoid using chemical sunscreen. Protect yourself from sunburn with clothing and shade. And when it is necessary to use sunscreen, look for a chemical-free product with zinc oxide as the active ingredient. (You can find several brands at health food stores.)