What is SPF and how much sunscreen do you really need? Experts answer
Briefly

SPF protects against skin cancer and premature aging by shielding from the sun's UVB rays, as explained by dermatologist Dr. Heather Rogers.
Misapplication of sunscreen can lead to dangerous consequences like skin cancer, the most common cancer in the US, and high rates of melanoma in the UK, as highlighted by oncologists Dr. Block and Dr. Hieken.
Read at www.theguardian.com
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