Separating fact from fiction about sunscreen with evidence-based science to help you make informed decisions about sun protection
FACT: Up to 80% of UV rays can penetrate clouds.
Cloud cover provides minimal UV protection. UVA rays, which cause aging and can contribute to skin cancer, penetrate clouds easily. Studies show that even on overcast days, UV radiation can reach 70-80% of clear sky levels.
FACT: All skin types can suffer UV damage and develop skin cancer.
While melanin provides some natural protection (equivalent to SPF 4), it's insufficient against UV damage. People with darker skin can still develop skin cancer, hyperpigmentation, and premature aging from sun exposure.
FACT: The difference in protection is minimal (1% more UV blocked).
SPF 30 blocks 97% of UVB rays, SPF 50 blocks 98%, and SPF 100 blocks 99%. The FDA considers SPF values above 50 misleading, as they provide minimal additional benefit while potentially giving users false confidence.
FACT: FDA-approved chemical filters are safe when used as directed.
While some chemical filters like oxybenzone have raised concerns, the benefits of sun protection far outweigh potential risks. Modern chemical sunscreens undergo rigorous safety testing, and concerns are often based on high-dose studies not reflective of normal use.
FACT: Reapplication every 2 hours is essential for continued protection.
Sunscreen degrades over time due to UV exposure, sweat, and friction. Even "all day" formulations need reapplication. Studies show that most people apply only 25-50% of the recommended amount, making reapplication even more critical.
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