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Posts tagged 'sunscreen'

How a bottlecap can keep you from getting skin cancer (and other fun facts about sunscreen)

By Arthur W. Perry, MD June 20, 2019 No comments


1) A dose of sunscreen is one full ounce. Use the bottlecap system. Fill half a bottlecap with sunscreen for your face, 1 cap for each arm, 2 caps for your legs, front and back. Do this and you’ll use the correct amount of sunscreen.

2) You don’t need to wear sunscreen if the UV Index is under 3. Sunscreen is NOT innocuous, and so you should use it only when the risk of sun damage is great.

3) The FDA considers zinc oxide and titanium dioxide to be the only safe sunscreens. What about the other 15? PABA and Trolamine are not safe and probably will be taken off the market. 1 is not marketed. The other 12 must submit data to the FDA proving they are safe.

4) SPF 15 blocks 93% of Ultraviolet B rays and lets the average person stay in sun for 5 hours without burning. SPF 30 blocks 97%, allowing you to stay in the sun for 10 hours. But seriously, who does that?

5) It takes the average person 4 minutes and 15 seconds to apply sunscreen. If you move faster, you’ll miss some areas…

Tags: sunscreen

It's sunscreen season

By Arthur Perry MD July 18, 2016 No comments

It's the middle of summer. The time when the sun is at its most intense. And that means you need to protect your skin - no matter what color it is. Sunshine contains visible light and invislble ultraviolet light (UV). You know that visible light contains all of the colors of the rainbow, but you may not know that UV light also contains a rainbow of colors. But you can't see the colors of UV light (did you know that some animals can?). The two main "colors" of UV light are called "A" and "B" (those scientists know how to name them, don't they?). The SPF designation deals with UVB. If your sunscreen covers UVA, it is called "broad spectrum". Sounds simple...but it isn't. In fact, there are many "colors" within UVA (85 to be exact), and to earn the "broad spectrum" designation by the FDA, a product only has to block exactly 1 of the 85 colors of UVA. Most broad spectrum sunscreens only block a few of the UVA colors. And that's the problem. So what's the solution? Zinc oxide - it blocks ALL of the UVA and UVB colors. It's a complete sunscreen. And now you know one of the reasons I use zinc oxide in my DayThyme product. (For the other reasons, check out my blog on the Dr. Oz website