SPF stands for Sun Protection Factor, and it measures how well a sunscreen protects your skin from UVB rays—the type of ultraviolet light that causes sunburn, skin damage, and skin cancer.
☀️ Why SPF Is Important:
1. Prevents Sunburn
SPF protects your skin from UVB radiation, which damages the outer layer of skin and causes painful burns.
2. Reduces Risk of Skin Cancer
Long-term UV exposure is the top cause of skin cancers—including melanoma, the deadliest type. Daily SPF use reduces this risk significantly.
3. Prevents Premature Aging
UV rays also break down collagen and elastin, leading to:
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Wrinkles
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Fine lines
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Sagging
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Dark spots (sunspots)
This is often called photoaging, and SPF helps prevent it.
4. Protects Skin Tone and Texture
SPF prevents hyperpigmentation, redness, and uneven texture from UV-induced damage, keeping your skin smoother and more even.
π How SPF Works:
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SPF 30: Blocks ~97% of UVB rays
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SPF 50: Blocks ~98%
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SPF 100: Blocks ~99%
No sunscreen blocks 100%, so reapplication is key.
✅ SPF Best Practices:
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Use SPF 30 or higher daily—even on cloudy days or indoors (UV can penetrate windows).
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Apply generously to all exposed skin.
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Reapply every 2 hours (or immediately after sweating or swimming).
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Use broad-spectrum sunscreen to also block UVA rays (which cause aging).