Sunscreens are topical products designed to protect the skin from the harmful effects of ultraviolet (UV) radiation from the sun. They play a critical role in preventing sunburn, skin damage, and reducing the risk of skin cancer. Here are some key points about sunscreens:
Types of Sunscreens
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Chemical Sunscreens:
- Absorb UV radiation and convert it into heat, which is then released from the skin.
- Common ingredients include avobenzone, octisalate, octocrylene, and oxybenzone.
- Physical (Mineral) Sunscreens:
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- Contain active mineral ingredients like zinc oxide or titanium dioxide that sit on top of the skin and reflect UV rays.
- Generally recommended for sensitive skin.
SPF (Sun Protection Factor)
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SPF Rating: Indicates the level of protection against UVB rays, which cause sunburn.
- SPF 30 blocks about 97% of UVB rays.
- SPF 50 blocks about 98%.
Broad-Spectrum Protection
- Look for sunscreens labeled "broad-spectrum," which means they protect against both UVA (aging) and UVB (burning) rays.
Application Tips
- Amount: Use about an ounce (a shot glass full) for full body coverage.
- Reapplication: Reapply every two hours, or more often if swimming or sweating.
- Timing: Apply sunscreen 15-30 minutes before sun exposure.
Other Considerations
- Water Resistance: Some sunscreens are labeled as water-resistant, but they still need to be reapplied after swimming or sweating.
- Expiration Date: Check the expiration date, as sunscreens can lose effectiveness over time.
Using sunscreen consistently is essential for maintaining skin health, especially during high sun exposure periods.
