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Br J Dermatol. 2019 May 8. doi: 10.1111/bjd.17888. [Epub ahead of print]

Optimal sunscreen use, during a sun-holiday with a very high UV index, allows vitamin D synthesis without sunburn.

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King's College London, St John's Institute of Dermatology, London, SE1 9RT, UK.
Medical University of Łódź, Department of Dermatology, Pediatric Dermatology and Dermatological Oncology, Łódź, 90-647, Poland.
Walgreens Boots Alliance Inc, Nottingham, NG90 5EF, UK.
Bispebjerg Hospital, Department of Dermatological Research, Copenhagen, 2400, Denmark.
Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Chilton, Didcot, Oxfordshire, OX11 0RQ, UK.
Dermoklinika Centrum Medyczne, Łódź, 90-436, Poland.



Sunlight contains UVA and UVB radiation. The latter 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.


The impact of sunscreens on vitamin D status was studied during a one-week sun-holiday in Tenerife (28°N). Comparisons were made between two formulations, each with a sun protection factor of 15. The UVA protection factor (UVA-PF) was low in one case and high in the other. Healthy Polish volunteers (n=20 per group) were given the sunscreens and advised on correct application. Comparisons were also made with discretionary sunscreen use (n=22) and non-holiday groups (51o 5N, n=17). Sunscreen use in the intervention groups was measured. Behaviour, UVR exposure, clothing cover and sunburn were monitored. Serum 25(OH)D, was assessed by HPLC MS/MS.


Use of intervention sunscreens was the same (p=0.599) and both equally inhibited sunburn, that was present in the discretionary use group. There was an increase (p=9x10-8 ) of 28.0±16.5(SD) nmol/L 25(OH)D3 in the discretionary use group. The high and low UVA-PF sunscreen groups showed statistically significant increases (p≤6.7x10-5 ) of 19.0±14.2 and 13.0±11.4 nmol/L 25(OH)D3 respectively. The non-holiday group showed a fall (p=0.08) of 2.5±5.6 nmol/L 25(OH)D3 .


Sunscreens may be used to prevent sunburn yet allow vitamin D synthesis. A high UVA-PF sunscreen enables significantly higher vitamin D synthesis than a low UVA-PF sunscreen because the former, by default, transmits more UVB than the latter. This article is protected by copyright. All rights reserved.


SED ; UVR ; UVA protection factor; Vitamin D; erythema; holiday; sunburn; sunscreen


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