SPF 30 vs SPF 50: The truth about sunscreens
The TRUTH about sunscreen protection First, it's probably key to understand that UV radiation reaches the earth in the form of UVB and UVA rays. UVB radiation plays a key role in skin cancer. UVA radiation plays a key role in skin ageing, and suggested to aid to initiate some skin cancers. 1) SPF is related to UVB protection only. 2) SPF 15 sunscreen blocks 93% of UVB radiation, SPF 30 sunscreen blocks nearly 97% of UVB radiation, SPF 50 sunscreen blocks 98% of UVB radiation
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