<p>Dr. Smith reveals how you can use a sunscreen’s SPF number to calculate just how long you can safely stay out in the sun.</p>

Dr. Smith reveals how you can use a sunscreen’s SPF number to calculate just how long you can safely stay out in the sun.

How to Use Sunscreens and SPF Numbers

Howard G. Smith MD, AM has been reporting health and wellness news for more than 40 years on radio and via podcasts. Harvard Medical School, MD; Harvard University, AM, Immunology; former Medical Editor, WBZ-AM, Boston. Website: http://www.drhowardsmith.com Email: drhowardsmith.reports@gmail.com

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How to Use Sunscreens and SPF Numbers

How to Use Sunscreens and SPF Numbers