Do you need SPF 30, 50 or 100? Dermatologists answer your burning sunscreen questions
Summary
The article explains what SPF numbers on sunscreen mean and how well they protect skin from UVB rays, which cause sunburn. It advises using at least SPF 30 sunscreen that is broad spectrum and water-resistant, applying it correctly, and reapplying frequently for best protection.Key Facts
- SPF stands for Sun Protection Factor and shows how well sunscreen blocks UVB rays that cause sunburn.
- SPF 30 blocks about 97% of UVB rays, SPF 50 blocks about 98%, and SPF 100 blocks about 99%.
- Higher SPF does not mean double the protection; the increase gets smaller as SPF goes up.
- Use sunscreen labeled “broad spectrum” to protect against both UVA and UVB rays.
- Water-resistant sunscreen is important for activities involving sweating or water.
- Most people do not apply enough sunscreen, so higher SPF can provide a safety margin.
- Sunscreen should be reapplied at least every two hours or after swimming or sweating.
- Avoid sun exposure during peak hours from 10 a.m. to 4 p.m. for better sun safety.
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