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BACKGROUND: Sunlight contains ultraviolet (UV)A and UVB radiation. UVB is essential for vitamin D synthesis but is the main cause of sunburn and skin cancer. Sunscreen use is advocated to reduce the sun's adverse effects but may compromise vitamin D status. OBJECTIVES: To assess the ability of two intervention sunscreens to inhibit vitamin D synthesis during a week-long sun holiday. METHODS: ] was assessed by high-performance liquid chromatography-tandem mass spectrometry. CONCLUSIONS: concentration. An SPF 15 formulation with high UVA protection enables better vitamin D synthesis than a low UVA protection product. The former allows more UVB transmission.
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Young et al. (2019) studied this question.
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