Sunscreen is classified as a chemical and sunbock is physical. What sunscreen does is absorb and reflect ultraviolet radiation, while sunblock physically blocks both UVA and UVB radiation from the skin.
UVA rays are aging rays that penetrate the skin more deeply causing wrinkles, along with cracking and shrinking the collagen and elastin in our skin. This rays can go through windows and clothing, so you are always in danger of exposure.
UVB rays are the burn rays. The rays affect the epidermis - the outer layer of skin, and is the main cause of cancer.
***Sunscreen takes about 30 min to penetrate the skin, so apply it at least half an hour before sun exposure.
Source: Summarized info from my Sephora book
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http://www.copperwiki.org/index.php/Sunscreen
Apparently one should Use sun block rather than sunscreen. Sunblock lies ontop of the skin rather than getting absorbed by it.
Do not used micronised titanium products. Smaller particles of titanium tend to enter the skin and cause damage. Stick with the un-micronised stuff. Sunscreen and Sunblocks
Use broad spectrum sunblocks.
Eat for sun protection: load up on natural anti-oxidants in your diet. Include fresh berries, green tea, spirulina and as many other natural anti-oxidants as you can.
Cover up in the sun: the clothing, hats and glasses with afford lots of protection.
Use natural sunscreens like shea butter.
Use natural anti tanners like real lemon juice.
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