What do systematic reviews say?

B vitamins vs placebo

• Vitamin and mineral supplementation for preventing dementia or delaying cognitive decline in people with mild… 2018 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 138 participants
  Moderate

Oral nutritional supplements vs placebo

The review found no eligible studies for this question.

• Nutritional interventions for treating foot ulcers in people with diabetes 2020 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

The review found no eligible studies for this question.

• Vitamins C and E for asthma and exercise‐induced bronchoconstriction 2014 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

The review found no eligible studies for this question.

• Vitamins C and E for asthma and exercise‐induced bronchoconstriction 2014 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found