An SPF 15 blocks 93% of UVB radiation, while SPF 30 blocks nearly 97%. SPF 50 blocks approximately 98%. Above 50, the increase in UVB protection is minimal. Higher SPF values offer some increased safety, generally because people do not apply enough sunscreen. To determine SPF, 2 milligrams of sunscreen per square centimeter of skin is used. In reality, most people only use 0.5 to 1 milligram per square centimeter of skin, so, the actual SPF they are receiving is about 1/3 of the labeled value.
SPF's mainly measure UVB protection, so be sure to choose a sunscreen that included UVA protection! UVA rays not only accelerate skin aging, but contributes to skin cancers.
A posting of miscellaneous information pertaining, for the most part, to skin care, hair removal and esthetics. A medical esthetician and certified medical electrologist with a Degree in Natural Health, I have 11 years experience that include the spa industry and medical aesthetics with plastic surgeons and dermatologists. I also do freelance skin care training and am currently designing The Aesthetic Apothecary. Stay tuned for more information on that exciting adventure!
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