Do sunscreens block UVA rays as well as UVB rays?
Most common sunscreen ingredients (derivatives of PABA, or para-aminobenzoic acid) filter the ultraviolet beta (UVB) rays effectively. But they are less effective against the ultraviolet alpha (UVA) rays, which used to be thought harmless. The UVA rays can damage the skin’s connective tissue and lead to premature aging and to cancer. To protect yourself against UVA rays, choose a sunscreen that contains a benzone compound (benzophenone or oxybenzone) and a PABA compound or other UVB block. Brands that protect against UVB as well as some UVA rays are Bain de Soleil 15, PreSun 15, Sundown 8 and 15, Clinique 19, Elizabeth Arden 15, and Estee Lauder sunscreens. Besides potent anti-UV ingredients, choose a sunscreen with a sun protection factor (SPF) of at least 15. Apply the sunscreen an hour before exposure to allow time for it to penetrate the outer skin layer. “Waterproof” means the product maintains its SPF after four 20-minute swims, “water resistant” after two swims. Use generous amo
