Sunscreens are potentially harmful

Research has shown that some sunscreen ingredients can seep through the skin into your bloodstream. Several spray sunscreens were recalled after benzene, a known carcinogen, was detected in them, and Hawaii has banned certain ingredients because of concerns that they may harm ocean reefs.

While those issues raise real concerns, the risks are more theoretical than proven. Regular sunscreen use does prevent skin cancers and saves lives. It can lower the risk of melanoma by about 50 per cent.