The US regulator Food and Drug Administration has announced new rules for sunscreen labels. Under these new rules sunscreens will carry a “broad spectrum” label to show they offer some protection against ultraviolet A radiation (UVA ) as well as ultraviolet B (UVB) radiation .
Though the US administration is taking steps to rectify the situation, it remains unclear in the UK, where sunscreen bottles only show Sun Protection Factor (SPF), which only blocks UVB rays.
There are two types of ultraviolet (UV) light that could harm our skin — UVA and UVB. A broad-spectrum, or full-spectrum, sunscreen is designed to protect us from both.
UVA rays can penetrate deeply into our skin and suppress our immune system. This increases the risk of wrinkling and age spots. UVB rays can burn our skin. Too much exposure to both UVA and UVB rays raises the risk of skin tumours, including a form of cancer called squamous cell carcinoma. The best sunscreens, now prescribed by the FDA, would offer protection from all UV light.
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