Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

948 questions · 998 findings · 100 reviews · Headline outcomes only

No studies found 233 · 23.3%GRADE not reported 40 · 4%Very low 203 · 20.3%Low 271 · 27.2%Moderate 176 · 17.6%High 75 · 7.5%

High‐treatment‐dose vitamin D (greater than 1000 IU/day) vs low‐treatment‐dose vitamin D (400 IU/day to 1000 IU/day)

Clinical relapse · people with inflammatory bowel disease

High‐treatment‐dose vitamin D (greater than 1000 IU/day) showed no clear difference in clinical relapse at end of study (52 weeks) compared with low‐treatment‐dose vitamin D (400 IU/day to 1000 IU/day) (low certainty).

1 finding from 1 review

High‐treatment‐dose vitamin D (greater than 1000 IU/day) vs low‐treatment‐dose vitamin D (400 IU/day to 1000 IU/day)

Withdrawals due to adverse events · people with inflammatory bowel disease

It is very uncertain whether high‐treatment‐dose vitamin D (greater than 1000 IU/day) changes withdrawals due to adverse events compared with low‐treatment‐dose vitamin D (400 IU/day to 1000 IU/day) (very low certainty).

1 finding from 1 review

Steroid plus vitamin D vs vitamin D

Number of participants achieving 'clearance' by IGA · scalp psoriasis

Steroid plus vitamin D leads to higher number of participants achieving 'clearance' by IGA compared with vitamin D (high certainty).

1 finding from 1 review

Steroid plus vitamin D vs vitamin D

Number of participants achieving 'response' by IGA · scalp psoriasis

Steroid plus vitamin D probably leads to higher number of participants achieving 'response' by IGA compared with vitamin D (moderate certainty).

1 finding from 1 review

Steroid plus vitamin D vs vitamin D

Number of participants withdrawing due to adverse events (AE) · scalp psoriasis

Steroid plus vitamin D leads to lower number of participants withdrawing due to adverse events compared with vitamin D (high certainty).

1 finding from 1 review

Steroid plus vitamin D vs vitamin D

Number of participants achieving 'response' by PGA · scalp psoriasis

Steroid plus vitamin D probably leads to higher number of participants achieving 'response' by PGA compared with vitamin D (moderate certainty).

1 finding from 1 review

150,000 IU of vitamin D vs 300,000 IU of vitamin D

Ulcer healing · people with diabetes and foot ulcers

It is very uncertain whether 150,000 IU of vitamin D changes ulcer healing (absolute change in individual parameters of ulcer… compared with 300,000 IU of vitamin D (very low certainty).

2 findings from 1 review