What do systematic reviews say?

Vitamin D vs placebo

The review found no eligible studies for this question.

• Vitamin D supplementation for sickle cell disease 2020 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Vitamin D vs placebo

• Vitamin D supplementation for sickle cell disease 2020 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 37 participants
  Low

Vitamin D vs placebo or no intervention

• Effects of oral vitamin D supplementation on linear growth and other health outcomes among children under five years… 2020 · Cochrane Headline outcomes only
  no estimate extracted
  3 studies · 240 participants
  Low

Vitamin D vs placebo or no intervention

• Effects of oral vitamin D supplementation on linear growth and other health outcomes among children under five years… 2020 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 1258 participants
  Moderate

Vitamin D vs placebo or no intervention

Vitamin D showed no clear difference in stunting Definition: L/HAZ < ‐2Time frame: 6 months compared with placebo or no intervention (moderate certainty).

• Effects of oral vitamin D supplementation on linear growth and other health outcomes among children under five years… 2020 · Cochrane Headline outcomes only
  RR 0.9 [0.8, 1.01]
  1 study · 1247 participants
  Moderate

Vitamin D vs placebo or no intervention

Vitamin D showed no clear difference in adverse effect: hypercalciuria As defined by trialistsTime frame:… compared with placebo or no intervention (moderate certainty).

• Effects of oral vitamin D supplementation on linear growth and other health outcomes among children under five years… 2020 · Cochrane Headline outcomes only
  RR 2.03 [0.28, 14.67]
  2 studies · 68 participants
  Moderate

Vitamin D vs placebo or no intervention

It is very uncertain whether vitamin D changes adverse effect: hypercalcaemia As defined by trialistsTime frame:… compared with placebo or no intervention (very low certainty).

• Effects of oral vitamin D supplementation on linear growth and other health outcomes among children under five years… 2020 · Cochrane Headline outcomes only
  RR 0.82 [0.35, 1.9]
  2 studies · 367 participants
  Very low

Vitamin D vs placebo or no intervention

The review found no eligible studies for this question.

• Effects of oral vitamin D supplementation on linear growth and other health outcomes among children under five years… 2020 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Vitamin D vs placebo or no intervention

The review found no eligible studies for this question.

• Effects of oral vitamin D supplementation on linear growth and other health outcomes among children under five years… 2020 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Vitamin D vs control

• Vitamin D supplementation for preventing infections in children under five years of age 2016 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 3046 participants
  Low

Vitamin D vs control

• Vitamin D supplementation for preventing infections in children under five years of age 2016 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 3046 participants
  Low

Vitamin D vs control

• Vitamin D supplementation for preventing infections in children under five years of age 2016 · Cochrane Headline outcomes only
  no estimate extracted
  2 studies · 3134 participants
  Moderate

Vitamin D vs control

• Vitamin D supplementation for preventing infections in children under five years of age 2016 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 88 participants
  Very low

Vitamin D vs control

• Vitamin D supplementation for preventing infections in children under five years of age 2016 · Cochrane Headline outcomes only
  no estimate extracted
  0 studies · 0 participants
  GRADE not reported

Vitamin D vs control

• Vitamin D supplementation for preventing infections in children under five years of age 2016 · Cochrane Headline outcomes only
  no estimate extracted
  2 studies · 7 participants
  GRADE not reported

Vitamin D vs control

• Vitamin D supplementation for preventing infections in children under five years of age 2016 · Cochrane Headline outcomes only
  no estimate extracted
  0 studies · 0 participants
  GRADE not reported

Vitamin D vs control

• Vitamin D supplementation for preventing infections in children under five years of age 2016 · Cochrane Headline outcomes only
  no estimate extracted
  0 studies · 0 participants
  GRADE not reported

Vitamin D vs placebo or control

Meta-analysis of randomised trials of vitamin D supplementation for Maternal vitamin D concentrations at term: WMD 47.08 (95% CI 23.76 to 70.39), statistically significant. Umbrella review outcome-level evidence grade: Probable.

• Vitamin D and multiple health outcomes: umbrella review of systematic reviews and meta-analyses of observational… 2014 All outcomes
  WMD 47.08 [23.76, 70.39]
  4 studies
  GRADE not reported

Vitamin D 100,000 IU/month vs 12,000 IU/month

• Vitamin D supplementation for sickle cell disease 2020 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 57 participants
  Low

Vitamin D given to infants vs vitamin D given to lactating mothers

• Vitamin D supplementation for term breastfed infants to prevent vitamin D deficiency and improve bone health 2020 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 92 participants
  Very low