evidence: Sunscreen is essential for protecting your skin from early aging and skin cancers, which often are a direct result of the sun's ultraviolet, or UV, radiation. [...] Myth #6: I won't get enough Vitamin D if I wear sunscreen. Fact: Even well-applied sunscreen lets 2% to 3% of the sun's ultraviolet B rays reach your skin, and your body needs only a little to produce vitamin D. Rather than risk skin cancer, it's better to seek your vitamin D needs through a healthy diet or supplement.