This one goes out to the delightful Bonnie L, who queried me about how often to apply her sunscreen.
30: The minimum SPF you should use (water resistant and a broad spectrum formula preferable).
20: The number of minutes before you go out in the sun that you should apply sunscreen. That is, unless your lotion has titanium dioxide or zinc oxide, which are effective immediately.
2: The number of hours you can go without reapplying if you’re not sweating or in the water.
1: The number of ounces you need to coat your body with enough product (a 0.002 mm layer) to provide the SPF listed on the label. If you’re using lotion, that’s about the amount that would fill a shot glass; if you’re using a clear, continuous spray, that’s 30 to 90 seconds of spraying—enough to create a visibly glossy sheen as it goes on.
I’m Dr. Michael Hunter, and I’m soon going to be in some spectacular Seattle weather (yes, the sunscreen is already on).
The small print: The material presented herein is informational only, and is not designed to provide specific guidance for an individual. Please check with a valued health care provider with any questions or concerns. As for me, I am a Harvard- , Yale- and UPenn-educated radiation oncologist, and I practice in the Seattle, WA (USA) area. I feel genuinely privileged to be able to share with you. If you enjoyed today’s offering, please consider clicking the follow button at the bottom of this page.
Coming Soon for iPad: Understand Breast Cancer in 60 Minutes; Understand Colon Cancer in 60 Minutes. Available now: Understand Colon Cancer in 60 Minutes; Understand Brain Glioma in 60 Minutes. All can be found at the Apple Ibooks store. Thank you.