Dr. Marie Jhin is a San Francisco based board certified dermatologist, an expert in Asian Skin, and the director of Premier Dermatology, a San Francisco Bay Area dermatology center. At Premier Dermatology, Dr. Jhin works closely with patients to create customized plans to treat a wide range of skin care needs.

Dr. Marie Jhin is a San Francisco based board certified dermatologist, an expert in Asian Skin, and the director of Premier Dermatology, a San Francisco Bay Area dermatology center

A fascinating and enlightening book by Dr. Jhin. Asian Beauty Secrets reveals why centuries-old customs have withstood the test of time.

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What is SPF?

What is SPF?

 Sunscreens are products combining several ingredients that help prevent the sun’s ultraviolet (UV) radiation from reaching the skin. Two types of ultraviolet radiation, UVA and UVB, damage the skin, age it prematurely, and increase your risk of skin cancer. UVB is the chief culprit behind sunburn, while UVA rays, which penetrate the skin more deeply, are associated with wrinkling, leathering, sagging, and other light-induced effects of aging (photoaging). They also exacerbate the carcinogenic effects of UVB rays, and increasingly are being seen as a cause of skin cancer on their own. Sunscreens vary in their ability to protect against UVA and UVB.  What is SPF? Most sunscreens with an SPF of 15 or higher do an excellent job of protecting against UVB. SPF — or Sun Protection Factor — is a measure of a sunscreen’s ability to prevent UVB from damaging the skin. Here’s how it works: If it takes 20 minutes for your unprotected skin to start turning red, using an SPF 15 sunscreen theoretically prevents reddening 15 times longer — about five hours. Another way to look at it is in terms of percentages: SPF 15 filters out approximately 93 percent of all incoming UVB rays. SPF 30 keeps out 97 percent and SPF 50 keeps out 98 percent. They may seem like negligible differences, but if you are light-sensitive, or have a history of skin cancer, those extra percentages will make a difference. And as you can see, no sunscreen can block all UV rays. But there are problems with the SPF model: First, no sunscreen, regardless of strength, should be expected to stay effective longer... read more