Here is a natural sun block that is sophisticated enough to really work and that you can make yourself.

The two important ingredients in this formula are sesame oil and zinc oxide. Sesame oil is a natural sunscreen. Zinc oxide is a derivative of pure zinc. It is mildly antiseptic, antifungal, antibacterial, and astringent, and it blocks both UVA and UVB radiation, offering the broadest UV protective spectrum.

Besides sunblock, eating a diet rich in antioxidants, and in particular beta-carotene, helps protect against skin cancer.

Apply this block every hour so. Note that UV rays are the most intense from 10 a.m. to 2 p.m.

Better Basic Sunblock DIY
Zinc oxide powder is available on the Internet and herbalist stores.
2 1/2 ounces sesame oil
1 1/2 ounces coconut oil or cocoa butter
1/2 ounce beeswax
4 ounces distilled water
2 tablespoons zinc oxide

Melt the oils and beeswax in a double boiler over medium heat. Remove from the heat, add the water, and mix with an electric handheld mixer until thick and creamy. Stir in the zinc oxide. Store in a glass jar with a screw top. The shelf life will be about 4 months.

–Adapted from Better Basics for the Home, by Annie B. Bond (Three Rivers Press, 1999).