So what does the SPF value signify? ‘SPF 100 blocks around 99% of UVB rays, SPF 50 blocks around 98% and SPF 30 blocks around ...

They protect against UVB and UVA rays. But as the chart below shows, double the SPF doesn’t mean the sunscreen blocks double the UVB rays. For example, an SPF 30 isn’t twice as protective as ...

SPF measures how much UVB radiation sunscreen ... If you just went swimming, apply immediately after since water-resistant does not mean waterproof. Quick tip: Take other precautions while ...

There are pros and cons to everything, and this especially rings true with mineral and chemical sunscreen. “It is normal to ...

Having sun cream on during the usually hotter summer months is an important measure to help protect your skin, but some may ...

But how does sunscreen work? What does SPF mean? Here's everything you need to know before you hit the beach this summer. More from Science We all know we're supposed to wear sunscreen to protect ...

Using an SPF 30 sunscreen will block about 97% of the same rays. SPF does not indicate the fraction of UV-A rays that can be blocked, and these are the rays that lead to wrinkles and skin cancer. In ...