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What's an SPF?

Many of the sunscreens that you see on the shelf have a number on them, called an “SPF.” What does SPF stand for?

  1. Skin Penetrance Factor

  2. Skin Pleasantry Factor

  3. Skin Protective Factor

  4. Sun Penetrance Feature

  5. Sun Protective Factor

The correct answer is (e), Sun Protective Factor. This number measures the effectiveness of that sunscreen in protecting you from a sunburn from either sunlight, or from ultraviolet light (UV light) from tanning bulbs.