Author

Study design

Country of study

Age of participants

Study size/comparison

Dose of vitamin D

Loss to follow-up

Vitamin D

Placebo

Ahmadi et al., 2013

RCT

Iran (Isfahan)

Older than 20 years

30

30

50,000 IU/week

9

Al-Zahrani, 2014

RCT

Saudi Arabia

Not specified

100

100

45,000 IU/week for two months, and a single dose of 45,000 IU in the last month

17

Breslavsky et al., 2013

RCT

Not specified

Mean age of 66.8

24

23

1000 IU/day for 12 months

15

Elkassaby et al., 2014

RCT

Australia

30 - 60

26

24

6000 IU/day

Not specified

Ghavamzadeh et al., 2013

RCT

Iran

Mean age of 49.28

26

25

400 IU/day of vitamin D3

Not specified

Heshmat et al., 2012

RCT

Iran (Tehran)

37 - 79

21

21

Single intramuscular injection of 300,000 IU of vitamin D3

Not specified

Jehle et al., 2014

RCT

Switzerland

>16

29

26

300,000 IU of vitamin D3

Not specified

Jorde et al.,2009

RCT

North Norway

21 - 76

16

16

40,000 IU/week cholecalciferol

4

Kampmann, 2014

RCT

Denmark

>18

7

8

11,200 IU/day cholecalciferol for two weeks and 5600 IU/day for 10 weeks

1

Kota et al., 2012

RCT

India (Hyderabad)

22 - 63

15

15

Not specified

Not specified

Neyestani et al., 2012

RCT

30 - 60

30

30

500 IU/day vitamin D and 150 mg calcium/250ml/day

Not specified

Ryu et al., 2013

RCT

South Korea

Not specified

79

79

1000 IU cholecalciferol daily combined with 100mg of elemental calcium twice daily

29

Shar-Bidar et al., 2011

RCT

Iran (Tehran)

29 - 67

50

50

Vitamin D fortified yoghurt (170 mg calcium and 150 IU vitamin D)

Not specified

Strobel et al., 2014

RCT

Germany

30 - 78

39

33

20 drops of Vigantol oil/ week (1904 IU/day)

14

Sugden et al., 2007

RCT

Scotland

Mean age of 64.2

17

17

A single dose of 100,000 IU vitamin D2

9

Thethi et al., 2015

RCT

USA

18 - 70

30

30

1 mcg paricalcitol

5

Yousefi Rad et al., 2015

RCT

Iran

30 - 60

28

30

4000 IU/day

7