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Ask the expert: Breaking down SPF (Q&A)
Confused by SPF - Take a number
We all see this on our sunscreen labels but what does it actually mean? SPF stands for Sun Protection Factor. SPF represents the amount of protection the sunscreen provides from UVB rays. So the number indicates the strength of protection. For instance, using an SPF 30 sunscreen theoretically prevents reddening/sunburn 30 times longer.