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%

Vitamin A and fish oils (docosahexaenoic acid) vs placebo, vitamins, or no treatment

Visual acuitychange in logMAR visual acuity, may be reported as ETDRS · retinitis pigmentosa

It is very uncertain whether vitamin A and fish oils (docosahexaenoic acid) changes visual acuitychange in logMAR visual acuity, may be reported as ETDRS compared with placebo, vitamins (including vitamin A), or no therapy (very low certainty).

1 finding from 1 review

Vitamin D + calcium + other vitamins and minerals vs calcium + other vitamins and minerals (but no vitamin D)

Gestational diabetes · pregnant women and their infants..

It is very uncertain whether vitamin D + calcium + other vitamins and minerals changes gestational diabetes compared with calcium + other vitamins and minerals (but no vitamin D) (very low certainty).

1 finding from 1 review