Sunblock, also known as sunscreen or sun cream, is a photoprotective topical product for the skin that helps protect against sunburn and most importantly, skin cancer. Sunscreens are classified according to the type of active ingredient(s) present in the formulation as mineral or physical sunscreens and chemical sunscreens. Mineral sunscreens are made with titanium dioxide and zinc oxide, usually in the form of nanoparticles, and work like a shield by sitting on the surface of the skin and reflecting the suns rays. Chemical sunscreens contain carbon-containing molecules that absorb light, such as oxybenzone, octinoxate, octisalate, and avobenzone, and work like a sponge by absorbing the suns rays.
Positive aspects of sunblock include:
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Protection from UV radiation: Sunblock helps protect the skin from the harmful effects of UV radiation, including sunburn and skin cancer.
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Ease of use: Sunblock is easy to apply and can be found in a variety of forms, including lotions, sprays, and sticks.
Negative aspects of sunblock include:
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Potential for skin irritation: Some people may experience skin irritation or allergic reactions to certain ingredients in sunblock.
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Environmental concerns: Some chemical ingredients in sunblock, such as oxybenzone, have been shown to harm coral reefs and other marine life.
The two active ingredients that have been classified as safe and effective by the FDA are zinc oxide and titanium dioxide.
