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. 2016 Aug 12;3:29. doi: 10.3389/fnut.2016.00029

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Copyright © 2016 Baur, Brandsch, König, Hirche and Stangl.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Concentrations of (A) vitamin D₂ and (B) vitamin D₃ in wheat germ oil, avocado oil, and rapeseed oil before and after a 4 min- and an 8 min-UVB exposure. UVB exposure conditions: oil layer thickness, 1.0 mm; UVB lamp distance, 10 cm.