New Beginnings Reviews: bottle

Flickr/Joe Shlabotnik

A sunscreen's sun protection factor (SPF) is only fully effective for two hours after you put it on. Experts recommend carrying a bottle of SPF 30 to SPF 50 sunscreen around with you, even on cloudy or rainy summer days, so you can throw some on if the sun comes out. You can still get a tan with sunscreen on, because while SPF blocks damaging UVB rays, it doesn't prevent deep-seeping UVA rays from penetrating your skin and giving it color.

Sun-soaking season is here, and that means that if you don't lather up with sunscreen, you could be doing serious damage to your skin cells' DNA, setting yourself up to develop a potentially deadly form of cancer.

Melanoma kills more than 10,000 Americans every year, according to the Skin Cancer Foundation. See the rest of the story at Business Insider

NOW WATCH: Here's what the SPF number on every bottle of sunscreen you buy actually means

See Also:

Photos of a scaly, discolored patch of skin on Trump's face have gone viral — here's what it is, according to a Yale dermatologist Eating one egg a day could significantly reduce your risk of heart disease, according to a major new study A little-known, rare, and extremely deadly virus has emerged and killed people in India — here's what to know about Nipah virus

SEE ALSO: How often you actually need to shower, according to science