What do systematic reviews say?

Vitamin C vs placebo

The review found no eligible studies for this question.

• Antioxidant vitamin and mineral supplements for preventing age‐related macular degeneration 2017 · 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.

• Vitamin D supplementation for prevention of cancer in adults 2014 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Vitamin E + vitamin C vs placebo

The review found no eligible studies for this question.

• Vitamin and mineral supplementation for preventing dementia or delaying cognitive decline in people with mild… 2018 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Vitamin E vs placebo

The review found no eligible studies for this question.

• Antioxidant vitamin and mineral supplements for slowing the progression of age‐related macular degeneration 2023 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Vitamin D vs placebo

The review found no eligible studies for this question.

• Calcium and vitamin D for increasing bone mineral density in premenopausal women 2023 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Vitamin E vs placebo

The review found no eligible studies for this question.

• Antioxidant vitamin and mineral supplements for preventing age‐related macular degeneration 2017 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

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

Vitamin D vs placebo or no intervention

• Vitamin D supplementation for chronic liver diseases in adults 2021 · Cochrane Headline outcomes only
  no estimate extracted
  0 studies · 0 participants
  GRADE not reported

Vitamin D 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

Vitamin E vs placebo

The review found no eligible studies for this question.

• Vitamin and mineral supplementation for preventing dementia or delaying cognitive decline in people with mild… 2018 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

hAMMSC‐CM + vitamin C vs hAMMSC‐CM

The review found no eligible studies for this question.

• Interventions for ulceration and other skin changes caused by nerve damage in leprosy 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Multivitamin vs placebo

The review found no eligible studies for this question.

• Antioxidant vitamin and mineral supplements for preventing age‐related macular degeneration 2017 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Vitamin C vs placebo

• Vitamin C for asthma and exercise‐induced bronchoconstriction 2013 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 201 participants
  Low

Vitamin C vs placebo

The review found no eligible studies for this question.

• Vitamin C for asthma and exercise‐induced bronchoconstriction 2013 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Vitamin E vs placebo

• Vitamin E for antipsychotic‐induced tardive dyskinesia 2018 · Cochrane Headline outcomes only
  no estimate extracted
  0 studies · 0 participants
  GRADE not reported

Vitamin D plus calcium vs vitamin D

The review found no eligible studies for this question.

• Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in children 2020 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Steroid plus vitamin D vs vitamin D

• Topical treatments for scalp psoriasis 2016 · Cochrane Headline outcomes only
  no estimate extracted
  0 studies · 0 participants
  GRADE not reported

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

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

Any‐treatment‐dose vitamin D (greater than 400 IU/day) vs supplemental‐dose vitamin D (less than 400 IU/day)

The review found no eligible studies for this question.

• Vitamin D for the treatment of inflammatory bowel disease 2023 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

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

• Vitamin D for the treatment of inflammatory bowel disease 2023 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 46 participants
  Very low