![]() Conventional sunscreens only protect against UVB rays. ![]() Sunscreens labelled as ‘broad spectrum’ or ‘full spectrum’ are designed to protect the skin from both UVA and UVB rays. The telltale reddening/burning of the skin is only a reaction to UVB rays and does not indicate possible UVA damage. Furthermore, no sunscreen (regardless of SPF number) should be expected to stay effective longer than 2 hours without reapplication. It is important to note that no sunscreen can block all UV rays. Though the differences are small, those who are light-sensitive or have a history of skin cancer will benefit from using sunscreens with a higher SPF. Here’s a look at SPF in terms of percentages: SPF 15 filters out approximately 93 percent of all incoming UVB rays, SPF 30 filters out 97 percent, and SPF 50 filters out 98 percent. For example, if it takes 20 minutes for your unprotected skin to start burning, using an SPF 15 sunscreen would theoretically prevent burning 15 times longer (about 5 hours). SPF is a measure of a sunscreen’s ability to prevent UVB rays from damaging the skin. Ultraviolet B (UVB) is the shorter wave UV ray that mainly affects the outer layers of the skin and can cause sunburns, skin damage, and skin cancer. Ultraviolet A (UVA) is the longer wave UV ray that penetrates deep into the skin and can cause skin damage, skin ageing, and skin cancer. The sun emits visible light you can see, infrared light you can feel as heat, and invisible ultraviolet (UV) radiation. Sunscreens differ in their ability to protect against UVA and UVB. Two types of ultraviolet radiation, UVA and UVB, can cause skin damage and increase the risk of skin cancer. Sunscreen (also known as sun screen, sunblock, suntan lotion, or sun cream) is a lotion, spray or gel that combines several ingredients that help prevent the sun’s ultraviolet (UV) radiation from reaching the skin and causing sunburn. This article aims to demystify sunscreens so you can understand the different products on the market and find the best one to suit your needs. Not only do sunscreens vary widely in protection level, but also in ingredients, texture, and stability. With so many sunscreen products on the market, it can be difficult to distinguish the difference between them.
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