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. 2016 Aug 30;8(9):533. doi: 10.3390/nu8090533

Figure 2.

Figure 2

Mean modeled UVB doses effective for pre-vitamin D3 synthesis (Jm−2) in Norway (mean of Oslo (60° N) and Tromsø (69° N)), Iceland (Reykjavik (64° N)) and Finland (60–70° N) (A); Ireland (51–54° N), the UK (50–59° N), Netherlands (Amsterdam, (52° N)), and Denmark (mean of Copenhagen and Aarhus (56° N)) (B); and Thessaloniki (40° N), Athens (37° N) and Crete (35° N) (C) on a monthly basis in a typical year (mean of 2003–2012). Dotted line reflects a threshold of 1000 Jm−2 as a guide to a dose below which dermal synthesis of pre-vitamin D3 is relatively low.