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Milk fortified with vitamin D was the main dietary source of vitamin D, providing 45% of daily intake. Altogether, 29% of the adolescents used no vitamin D supplements and 25% did not meet the recommended total vitamin D intake of 10\u00a0\u00b5g\/d. Mean (standard deviation) of S-25(OH)D was 62.0 (18.8) nmol\/l, and S-25(OH)D was\u2009&lt;\u200950\u00a0nmol\/l in 29.5% of the adolescents. Vitamin D intake from supplements was the main determinant of S-25(OH)D (<jats:italic>\u03b2<\/jats:italic>\u2009=\u20090.465, <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001), followed by consumption of milk products (<jats:italic>\u03b2<\/jats:italic>\u2009=\u20090.251, <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001), consumption of meat products (<jats:italic>\u03b2<\/jats:italic>\u2009=\u20090.179, <jats:italic>p<\/jats:italic>\u2009=\u20090.002), travels to sunny countries (<jats:italic>\u03b2<\/jats:italic>\u2009=\u20090.178, <jats:italic>p<\/jats:italic>\u2009=\u20090.002), and average daylight time (\u03b2\u2009=\u20090.162, <jats:italic>p<\/jats:italic>\u2009=\u20090.004).<\/jats:p>\n            <\/jats:sec><jats:sec>\n              <jats:title>Conclusion<\/jats:title>\n              <jats:p>Most of the adolescents had vitamin D intake at the recommended level, although a fourth did not meet the recommended total vitamin D intake of 10\u00a0\u00b5g\/d and almost a third had S-25(OH)D\u2009&lt;\u200950\u00a0nmol\/l. More attention should be paid to the sufficient intake of vitamin D in adolescents who do not use vitamin D supplements or fortified milk products.<\/jats:p>\n            <\/jats:sec><jats:sec>\n              <jats:title>Trial registration<\/jats:title>\n              <jats:p>ClinicalTrials.gov: NCT01803776, registered March 3, 2013.<\/jats:p>\n            <\/jats:sec>","DOI":"10.1007\/s00394-022-03039-y","type":"journal-article","created":{"date-parts":[[2022,11,9]],"date-time":"2022-11-09T14:02:49Z","timestamp":1668002569000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Sources of vitamin D and determinants of serum 25-hydroxyvitamin D in Finnish adolescents"],"prefix":"10.1007","clinical-trial-number":[{"clinical-trial-number":"nct01803776","registry":"10.18810\/clinical-trials-gov"}],"author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2082-8652","authenticated-orcid":false,"given":"Sonja","family":"Soininen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0290-8245","authenticated-orcid":false,"given":"Aino-Maija","family":"Eloranta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1838-7525","authenticated-orcid":false,"given":"Ursula","family":"Schwab","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9199-2871","authenticated-orcid":false,"given":"Timo A.","family":"Lakka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,11,9]]},"reference":[{"key":"3039_CR1","doi-asserted-by":"publisher","first-page":"83","DOI":"10.1159\/000443136","volume":"85","author":"CF Munns","year":"2016","unstructured":"Munns CF, Shaw N, Kiely M et al (2016) Global consensus recommendations on prevention and management of nutritional rickets. 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