SPF Source: WebMD completely unnecessary high SPF James M. Spencer, MD sunscreen with SPF 30 High-SPF sunscreens: Are they better? Source higher SPF’s don’t always mean better High-SPF sunscreens: Are they better? the risks high SPF high SPF webmd SPF SPF high SPF using an effective sunscreen WebMD article on WebMD Higher SPF’s are just a marketing ploy recommend SPF wear off after 2 hours completely unnecessary high SPF very high SPF numbers SPF of 45 high SPF