{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,26]],"date-time":"2025-09-26T13:10:18Z","timestamp":1758892218544,"version":"3.44.0"},"reference-count":18,"publisher":"Danish Medical Association","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Ugeskr L\u00e6ger"],"abstract":"<jats:p>Sunscreen is the most common way of protecting the skin against ultraviolet radiation damage from the sun. The Danish Health Authorities recommends using at least sun protection factor (SPF) 30 in Denmark. The SPF indicates how much the UV dose is reduced when 2 mg\/cm2 sunscreen is applied to the skin. The average Dane uses only a fourth of the recommended amount, resulting in a SPF 50 providing a real SPF of only 2.6 (Fourth root of 50). To obtain optimal sun protection, increased layer thickness is of crucial importance, which is why this review recommends applying sunscreen twice in the morning before sun exposure.<\/jats:p>","DOI":"10.61409\/v05250383","type":"journal-article","created":{"date-parts":[[2025,7,31]],"date-time":"2025-07-31T10:27:18Z","timestamp":1753957638000},"page":"1-7","source":"Crossref","is-referenced-by-count":0,"title":["Sun protection with sunscreens"],"prefix":"10.61409","author":[{"given":"Hans Christian","family":"Wulf","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"40208","published-online":{"date-parts":[[2025,7,7]]},"reference":[{"key":"ref0","doi-asserted-by":"publisher","unstructured":"Kjeldsen EW, Ortner VK, Rossau AK et al. Keratinocytcancer. Ugeskr L\u00e6ger. 2025;187(14):V10240733. https:\/\/doi.org\/10.61409\/V10240733","DOI":"10.61409\/V10240733"},{"key":"ref1","doi-asserted-by":"publisher","unstructured":"Lim HW, Arellano-Mendoza MI, Stengel F. Current challenges in photoprotection. J Am Acad Dermatol. 2017;76(3S1):S91-S99. https:\/\/doi.org\/10.1016\/j.jaad.2016.09.040","DOI":"10.1016\/j.jaad.2016.09.040"},{"key":"ref2","doi-asserted-by":"publisher","unstructured":"Lergenmuller S, Rueegg CS, Perrier F et al. Lifetime sunburn trajectories and associated risks of cutaneous melanoma and squamous cell carcinoma among a cohort of Norwegian women. JAMA Dermatol. 2022;158(12):1367-1377. https:\/\/doi.org\/10.1001\/jamadermatol.2022.4053","DOI":"10.1001\/jamadermatol.2022.4053"},{"key":"ref3","doi-asserted-by":"publisher","unstructured":"Lautenschlager S, Wulf HC, Pittelkow MR. Photoprotection. Lancet. 2007;370(9586):528-37. https:\/\/doi.org\/10.1016\/S0140-6736(07)60638-2","DOI":"10.1016\/S0140-6736(07)60638-2"},{"key":"ref4","doi-asserted-by":"publisher","unstructured":"Heerfordt IM, Philipsen PA, Larsen B\u00d8, Wulf HC. Long-term trend in sunscreen use among beachgoers in Denmark. Acta Derm Venereol. 2017;97(10):1202-1205. https:\/\/doi.org\/10.2340\/00015555-2772","DOI":"10.2340\/00015555-2772"},{"key":"ref5","unstructured":"Wulf HC. Sol og solbeskyttelse. Ugeskr L\u00e6ger. 1994;156(25):3760-3764"},{"key":"ref6","unstructured":"Wulf HC, Eriksen P. UV-indeks og dets betydning. Ugeskr L\u00e6ger. 2010;172(17):1277-1279. https:\/\/ugeskriftet.dk\/videnskab\/uv-indeks-og-dets-betydning"},{"key":"ref7","unstructured":"DMI. UV-indeks, 2025. https:\/\/www.dmi.dk\/uv-indeks (24. apr 2025)"},{"key":"ref8","doi-asserted-by":"publisher","unstructured":"Wulf HC, Philipsen PA. Improving photoprotection and implications for 25(OH)D formation. Anticancer Res. 2020;40(1):511-518. https:\/\/doi.org\/10.21873\/anticanres.13979","DOI":"10.21873\/anticanres.13979"},{"key":"ref9","doi-asserted-by":"publisher","unstructured":"Heerfordt IM, Philipsen PA, Wulf HC. A handful of sunscreen for whole-body application. Adv Exp Med Biol. 2020:1268:381-385. https:\/\/doi.org\/10.1007\/978-3-030-46227-7_19","DOI":"10.1007\/978-3-030-46227-7_19"},{"key":"ref10","doi-asserted-by":"publisher","unstructured":"Heerfordt IM, Torsnes LR, Philipsen PA, Wulf HC. Sunscreen use optimized by two consecutive applications. PLoS One. 2018;13(3):e0193916. https:\/\/doi.org\/10.1371\/journal.pone.0193916","DOI":"10.1371\/journal.pone.0193916"},{"key":"ref11","unstructured":"Sundhedsstyrelsen. Faktaark om solbeskyttelse, 2025. https:\/\/www.sst.dk\/-\/media\/Udgivelser\/2019\/Faktaark-solbeskyttelse\/SolcremeX.ashx (08. apr 25)"},{"key":"ref12","doi-asserted-by":"publisher","unstructured":"Bodekaer M, Faurschou A, Philipsen PA, Wulf HC. Sun protection factor persistence during a day with physical activity and bathing. Photodermatol Photoimmunol Photomed. 2008;24(6):296-300. https:\/\/doi.org\/10.1111\/j.1600-0781.2008.00379.x","DOI":"10.1111\/j.1600-0781.2008.00379.x"},{"key":"ref13","doi-asserted-by":"publisher","unstructured":"Beyer DM, Faurschou A, Philipsen PA, Haedersdal M, Wulf HC. Sun protection factor persistence on human skin during a day without physical activity or ultraviolet exposure. Photodermatol Photoimmunol Photomed. 2010;26(1):22-7. https:\/\/doi.org\/10.1111\/j.1600-0781.2009.00479.x","DOI":"10.1111\/j.1600-0781.2009.00479.x"},{"key":"ref14","unstructured":"World Health Organization. Radiation: protecting against skin cancer, 2024. https:\/\/www.who.int\/news-room\/questions-and-answers\/item\/radiation-protecting-against-skin-cancer (08. apr 2025)"},{"key":"ref15","doi-asserted-by":"publisher","unstructured":"Beyer DM, Faurschou A, Haedersdal M, Wulf HC. Clothing reduces the sun protection factor of sunscreens. Br J Dermatol. 2010;162(2):415-9. https:\/\/doi.org\/10.1111\/j.1365-2133.2009.09478.x","DOI":"10.1111\/j.1365-2133.2009.09478.x"},{"key":"ref16","doi-asserted-by":"publisher","unstructured":"Young AR, Narbutt J, Harrison GI et al. Optimal sunscreen use, during a sun holiday with a very high ultraviolet index, allows vitamin D synthesis without sunburn. Br J Dermatol. 2019;181(5):1052-1062. https:\/\/doi.org\/10.1111\/bjd.17888","DOI":"10.1111\/bjd.17888"},{"key":"ref17","unstructured":"Sundhedsstyrelsen. Nye anbefalinger om solbeskyttelse: brug altid mindst faktor 30, og drop solariet, 2025. https:\/\/www.sst.dk\/da\/nyheder\/2025\/Nye-anbefalinger-om-solbeskyttelse-Brug-altid-mindst-faktor-30-og-drop-solariet (08. april 2025)"}],"container-title":["Ugeskrift for L\u00e6ger"],"original-title":[],"deposited":{"date-parts":[[2025,9,26]],"date-time":"2025-09-26T12:37:15Z","timestamp":1758890235000},"score":1,"resource":{"primary":{"URL":"https:\/\/ugeskriftet.dk\/videnskab\/V05250383"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,7,7]]},"references-count":18,"URL":"https:\/\/doi.org\/10.61409\/v05250383","relation":{},"ISSN":["0041-5782","1603-6824"],"issn-type":[{"type":"print","value":"0041-5782"},{"type":"electronic","value":"1603-6824"}],"subject":[],"published":{"date-parts":[[2025,7,7]]}}}