To get the full sun protection factor (SPF) that's printed on the bottle, you have to use the amount that scientists use in testing. For most sunscreens, that's about 2 mg/cm2. Here's how much that is in plain English.
Here are three key sunscreen ingredients . . .
Sunburn Safeguard
Most of us use only about a quarter of the sunscreen quantity needed to get the full SPF protection advertised on a label. To get the full benefit, you need to slather on a lot of the stuff -- about 2 milligrams of product per square centimeter of skin.
That translates roughly into about two finger-length squirts of the sunscreen applied to every major body area (head/neck/face, left arm, right arm, upper back, lower back, upper front torso, lower front torso, left thigh/knee, right thigh/knee, left lower leg/foot, right lower leg/foot).
Feel like you're swimming in sunscreen? Good. You're on the right track.
Now, brush up on what UVA, UVB, sun sensitivity, and SPF all mean with this article.
RealAge Benefit: Doing routine self-examinations for skin cancer can make your RealAge as much as 1.7 years younger.
RealAge Smart Search: Is wearing sun-protective clothing effective? Find out with RealAge Smart Search.
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