Debunking the 3 top sunscreen myths!
- Higher SPF values DO actually help, but how much you use matters more than SPF! At the thickness most people use, SPF 50 is really only SPF7. 30 is 5.5. I built a calculator that tells you how much you actually need.
- Reapplication isn’t for the reason you think! A recent study showed that, after 8 hours, SPF 70 was still working at SPF 64 levels. But you should reapply 15-30 minutes after your first application, once it’s dried. This ensures you get enough thickness and proper coverage- like using 2 coats of paint.
- Nano particles are NOT bad for you! Many claim that nano zinc oxide or titanium dioxide is toxic and ends up in the bloodstream. But many studies have shown that the particle sizes used– 20-150nm – are still way too large to get through the skin. Buuut breathing them can be toxic. So… don’t smooke your sunscreen?
Sunscreen Surface Area Calculator
Remember, this calculated amount assumes that you’re using a good sunscreen! Check out below for my top recommendations.
Sunscreens I Use
Full Body Sunscreen - UVA + UVB - German - The US standard for “broad spectrum” protection is pretty terrible. This one has the best European rating, at a great price!
Full Body Sunscreen - Broad Spectrum Mineral - Australian - For those who want a fully mineral, non-chemical option with a good price and nice texture. BONUS: It’s got a super cool bottle that changes color in the presence of harmful UV! 😎
Face Sunscreen - UVA/UVB - Sensitive Skin - This is a bit pricey for full-body application, but sometimes for the face it's worth going higher-quality. This broad-spectrum sunscreen has added Hyaluronic Acid, Caffeine, and green tea polyphenols for added hydration, skin tightening, and anti-oxidative effects.
(note: these are affiliate links–I have no relationship with the brand, but your using these links earns me a small commission on each purchase, at no added cost to you. Every little bit helps me keep putting out this content! 😄)
Calculation of sunscreen application thickness REF
Schlich formula for body surface area calculations