Does a sunscreen with a sun protection factor of 30 protect offer twice as much protection as a product with an SPF of 15?
According to the American Cancer Society, about 5.4 million basal and squamous cell skin cancers are diagnosed each year.
Melanoma, the deadliest variety of skin cancer, will account for about 76,380 cases of cancer in 2016.
[...] another study, from the Johns Hopkins University School of Medicine, gives further evidence many people aren’t using sunscreen correctly, including some who are otherwise vigilant about sun protection.
In the study, published in the Journa