And while we know the term SPF, do we really know what it means?
How much should we be applying?
Whichsunscreen innovationsare worth buying?And does the number on the bottle really matter?
Stocksy
This is a carefully measured number and requires lab testing for what we call MEDminimal erythema dosing.
Sunscreen is used to help protect the skin from the sun’s harmful ultraviolet (UV) rays.
It is safe for all skin types and ethnicities, says Guanche.
Byrdie
That being said, far more research is needed to prove this hypothesis.
What SPF Level Should You Use?
50 should block out 99 percent of UV when applied correctly, she explains.
Is SPF 15 Enough?
“Many people will not apply enough sunscreen to actually reach the SPF described on the bottle.
Also,reapplicationis a super important concept that people often fail to perform often enough,” he says.
Is Higher SPF Better?
You also need to reapply every two hours, or immediately after swimming or sweating.
Very few people apply the correct amount of sunscreen, and even fewer people reapply diligently and on time.
Therefore, dermatologists often recommend using a sunscreen of 50+ to create more room for human error.
“The higher the UPF, the less harmful rays will penetrate your clothing to reach your skin.
This measure of UV light accounts for both UVA and UVB,” says Glodny.
Do You Really Need to Wear SPF Every Day?
“Sunscreen is for every day!
That means overcast days, rainy days, partially sunny days… you name it.
UVB cant penetrate glass, but UVA can.
It should be worn every single day and, ideally, reapplied every two hours.
How to Decode Sunscreen Labels.
Accessed May 16, 2023. https://www.aad.org/public/everyday-care/sun-protection/shade-clothing-sunscreen/understand-sunscreen-labels.
Bens G.Sunscreens.Adv Exp Med Biol.
2014;810:429-63. doi: 10.1007/978-1-4939-0437-2_25.
The Skin Cancer Foundation.
