TY - JOUR T1 - Sunscreen SPFs: clear as daylight? JF - Drug and Therapeutics Bulletin JO - Drug Ther Bull SP - 61 LP - 61 DO - 10.1136/dtb.2011.02.0033 VL - 49 IS - 6 A2 - , Y1 - 2011/06/01 UR - http://dtb.bmj.com/content/49/6/61.abstract N2 - Recently issued public health guidance on skin cancer prevention from the National Institute for Health and Clinical Excellence (NICE) recommends that, used properly, a sunscreen with a sun protection factor (SPF) of at least 15 is enough.1 On the face of it, this advice seems reasonable given the theory that sun protection, whether from a sunscreen, a shirt, or shade, need only have an SPF of 15 to prevent sunburn from all-day exposure to tropical sunshine.2 The problem, though, is that a sunscreen only … ER -