Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

973 questions · 1,024 findings · 106 reviews

No studies found 235 · 22.9%GRADE not reported 59 · 5.8%Very low 207 · 20.2%Low 271 · 26.5%Moderate 177 · 17.3%High 75 · 7.3%

Provision of maize flour or maize flour products fortified with iron plus other vitamins and minerals vs unfortified maize flours or maize flour products

Any adverse effects (including constipation, nausea, vomiting, heartburn or diarrhoea, as measured by trialists) · general population older than 2 years of age (including pregnant women), in Kenya and Mexico

The review found no eligible studies for this question.

1 finding from 1 review

Dietary supplements (alpha lipoic acid +/- vitamins/lycopene/green tea; hypericum; Catuama; lycopene) vs placebo

Relief of burning/discomfort (symptom relief; pain intensity) · People with primary burning mouth syndrome (BMS), that is, oral mucosal pain with no dental or medical cause for such symptoms
1 finding from 1 review
  • Interventions for treating burning mouth syndrome 2016 · Cochrane All outcomes
    short-term (up to 3 months)
    SoF5 Dietary supplements vs placebo. Symptom relief short-term: insufficient or contradictory evidence regarding benefit of any evaluated dietary supplement; 628 participants (12 RCTs); very low. Subgroups: ALA without…
    12 studies · 628 participants
    Very low

Homocysteine‐lowering interventions (Folic Acid, Vitamin B6 and Vitamin B12) vs placebo or usual care

Myocardial infarction · people with or without existing cardiovascular disease, men and women

Homocysteine‐lowering interventions (Vitamin B6 (pyridoxine;… showed no clear difference in myocardial infarction compared with placebo or standard care (high certainty).

1 finding from 1 review

Homocysteine‐lowering interventions (Folic Acid, Vitamin B6 and Vitamin B12) vs placebo or usual care

Stroke · people with or without existing cardiovascular disease, men and women

Homocysteine‐lowering interventions (Vitamin B6 (pyridoxine;… leads to lower stroke compared with placebo or standard care (high certainty).

1 finding from 1 review

Homocysteine‐lowering interventions (Folic Acid, Vitamin B6 and Vitamin B12) vs placebo or usual care

Death by any cause · people with or without existing cardiovascular disease, men and women

Homocysteine‐lowering interventions (Vitamin B6 (pyridoxine;… showed no clear difference in death by any cause compared with placebo or standard care (high certainty).

1 finding from 1 review

Homocysteine‐lowering interventions (Folic Acid, Vitamin B6 and Vitamin B12) vs placebo or usual care

Adverse events · people with or without existing cardiovascular disease, men and women

Homocysteine‐lowering interventions (Vitamin B6 (pyridoxine;… showed no clear difference in adverse events compared with placebo or standard care (high certainty).

1 finding from 1 review

Oral nutritional supplements vs placebo

Ulcer healing · people with diabetes and foot ulcers

The review found no eligible studies for this question.

2 findings from 1 review

Preconception lifestyle advice on a combination of topics vs usual care or attention control

Reported behavioural changes on vitamin or mineral supplement intake: number of women with adequate use of folic acid supplement · people with infertility

Preconception lifestyle advice on a combination of topics showed no clear difference in reported behavioural changes on vitamin or mineral supplement… compared with routine care or attention control (low certainty).

1 finding from 1 review