Skip to main content

Table 3 Baseline and Follow-up Serum 25(OH)D concentrations

From: Effects of vitamin D3 supplementation on serum 25(OH)D concentration and strength in athletes: a systematic review and meta-analysis of randomized controlled trials

ReferenceLatitudeTimeVitamin D3 Daily DosageBaseline (ng/mL)N = 1491 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° NJan–Feb500010.9 ± 0.520 38.4 ± 1.5   
012.4 ± 0.815 13.1 ± 1.0   
Fairbairn 2018 [31]45–46.5° SMar–May357037.2 ± 7.628  44.4 ± 7.2 45.6 ± 7.6
038 ± 6.829  34 ± 6.8 32 ± 8.4
Close 2013b [32]53° NNov–Jan500011.6 ± 10.05   41.3 ± 10.0 
021.2 ± 11.65   29.6 ± 9.6 
Close 2013a [28]53° NJan–Apr571420.4 ± 10.46  39.3 ± 5.6 36.5 ± 9.6
285721.2 ± 10.410  31.7 ± 5.6 34.1 ± 4.0
020.8 ± 10.89  14.8 ± 7.2 16.4 ± 8.8
Wyon 2016 [29]52.3° NFeb18,75013.2 ± 3.81116.8 ± 3.2    
016.3 ± 2.71116.3 ± 2.6    
  1. Data are mean ± standard deviation unless stated otherwise. Measurements are in ng/mL