Reference | Latitude | Time | Vitamin D3 Daily Dosage | Baseline (ng/mL) | N = 149 | 1 Week (ng/mL) | 4 Weeks (ng/mL) | 6 Weeks (ng/mL) | 8 Weeks (ng/mL) | 12 Weeks (ng/mL) |
---|---|---|---|---|---|---|---|---|---|---|
IU | ||||||||||
Jung 2018 [30] | 33.3° N | Jan–Feb | 5000 | 10.9 ± 0.5 | 20 | 38.4 ± 1.5 | ||||
0 | 12.4 ± 0.8 | 15 | 13.1 ± 1.0 | |||||||
Fairbairn 2018 [31] | 45–46.5° S | Mar–May | 3570 | 37.2 ± 7.6 | 28 | 44.4 ± 7.2 | 45.6 ± 7.6 | |||
0 | 38 ± 6.8 | 29 | 34 ± 6.8 | 32 ± 8.4 | ||||||
Close 2013b [32] | 53° N | Nov–Jan | 5000 | 11.6 ± 10.0 | 5 | 41.3 ± 10.0 | ||||
0 | 21.2 ± 11.6 | 5 | 29.6 ± 9.6 | |||||||
Close 2013a [28] | 53° N | Jan–Apr | 5714 | 20.4 ± 10.4 | 6 | 39.3 ± 5.6 | 36.5 ± 9.6 | |||
2857 | 21.2 ± 10.4 | 10 | 31.7 ± 5.6 | 34.1 ± 4.0 | ||||||
0 | 20.8 ± 10.8 | 9 | 14.8 ± 7.2 | 16.4 ± 8.8 | ||||||
Wyon 2016 [29] | 52.3° N | Feb | 18,750 | 13.2 ± 3.8 | 11 | 16.8 ± 3.2 | ||||
0 | 16.3 ± 2.7 | 11 | 16.3 ± 2.6 |