Structured population data were available for 3 of 3 supporting studies. 2 studies described participants with type 2 diabetes. 2 studies described adult participants.

3 supporting studies do not have a displayable topic-matched quantitative effect.

Evidence uses heterogeneous comparison contexts: placebo, usual_care.

Available source content was suppressed because validation identified a conflict.

Placebo Group

Core clinician-reference fields are available or not applicable.

Participants received oral vitamin D3 at a dose of 50,000 IU once weekly for 24 weeks.

Vitamin D3 Group

Sixty adult males with established T2DM were randomly assigned to receive oral vitamin D3 (cholecalciferol) 50,000 IU once weekly (n=30) or a matching placebo (n=30) for 24 weeks.

Participants received a placebo vitamin B complex capsule administered orally once weekly for the same duration.

Participants in the control group received a placebo vitamin B complex capsule administered orally once weekly for the same duration.

Authoritative quality diagnostic: invalid or missing unit.

Authoritative quality diagnostic: invalid or missing value.

High-dose vitamin D3 does not improve insulin resistance in type 2 diabetes

Participants received vitamin D supplementation alongside standard care.

Vitamin D Group

229 women with GDM were assigned to receive 200 IU of vitamin D twice daily or a placebo for 6 weeks alongside standard care.

Participants received a placebo alongside standard care.

Vitamin D supplementation reduces neonatal birth weight in gestational diabetes

No Vitamin D3 supplementation

Participants received Vitamin D3 supplementation as an adjunct to scaling and root planing.

Vitamin D3 Supplementation Group

Following SRP, the first 25 people in each group got 60,000 IU of oral vitamin D3 granules once a week for eight weeks.

Participants did not receive Vitamin D3 supplementation.

The remaining 21 subjects from each group did not receive Vitamin D3 supplementation.

Vitamin D3 may improve periodontal health in diabetes

Structured population data were available for 3 of 3 supporting studies. Diabetes type was heterogeneous: 2 studies with type 2 diabetes, 1 studies with type 1 diabetes. 2 studies described adult participants.

1 of 2 studies with duration data have follow-up of 12 weeks or less.

Structured population data were available for 4 of 4 supporting studies. 3 studies described participants with type 2 diabetes. 3 studies described adult participants.

1 supporting study does not have a displayable topic-matched quantitative effect.

Evidence uses heterogeneous comparison contexts: active_comparator, placebo.

Structured population data were available for 3 of 3 supporting studies. 3 studies described participants with type 2 diabetes. 3 studies described adult participants.

1 study contains conflicting p-value and significance fields; those significance claims are suppressed.

Structured population data were available for 3 of 3 supporting studies. 1 study described adult participants.

2 relevant studies have unresolved authoritative design evidence and do not contribute to design-specific or RoB-specific claims.

Upstream consistency scoring indicates mixed findings across the evidence.

Evidence uses heterogeneous comparison contexts: active_comparator, baseline_within_group, usual_care.

2 supporting studies have high, serious, critical, unclear, or unavailable risk-of-bias information.

2 of 3 studies with duration data have follow-up of 12 weeks or less.

1 relevant study has unresolved authoritative design evidence and does not contribute to design-specific or RoB-specific claims.

Evidence uses heterogeneous comparison contexts: baseline_within_group, usual_care.

1 supporting study has high, serious, critical, unclear, or unavailable risk-of-bias information.

3 of 3 studies with duration data have follow-up of 12 weeks or less.

Structured population data were available for 3 of 3 supporting studies. 1 study described participants with type 2 diabetes. 2 studies described adult participants.

Structured population data were available for 3 of 3 supporting studies. 3 studies described participants with type 2 diabetes. 2 studies described adult participants.

Evidence uses heterogeneous comparison contexts: active_comparator, unknown_unresolved.

Structured population data were available for 3 of 3 supporting studies. Diabetes type was heterogeneous: 1 studies with type 1 diabetes, 1 studies with type 2 diabetes. 3 studies described adult participants.

Evidence uses heterogeneous comparison contexts: active_comparator, unknown_unresolved, usual_care.

Structured population data were available for 4 of 4 supporting studies. 2 studies described adult participants.

Evidence uses heterogeneous comparison contexts: other, usual_care.

3 supporting studies have high, serious, critical, unclear, or unavailable risk-of-bias information.

Structured population data were available for 4 of 4 supporting studies. 4 studies described participants with type 2 diabetes. 4 studies described adult participants.

Structured population data were available for 3 of 3 supporting studies. 3 studies described adult participants.

Structured population data were available for 3 of 3 supporting studies. 2 studies described participants with type 2 diabetes. 3 studies described adult participants.

Evidence uses heterogeneous comparison contexts: active_comparator, usual_care.

Evidence uses heterogeneous comparison contexts: placebo, unknown_unresolved, usual_care.

Structured population data were available for 6 of 6 supporting studies. Diabetes type was heterogeneous: 1 studies with type 1 diabetes, 1 studies with type 2 diabetes. 3 studies described adult participants.

3 relevant studies have unresolved authoritative design evidence and do not contribute to design-specific or RoB-specific claims.

Evidence uses heterogeneous comparison contexts: active_comparator, baseline_within_group, unknown_unresolved, usual_care.

3 of 6 studies with duration data have follow-up of 12 weeks or less.

Structured population data were available for 4 of 4 supporting studies. 2 studies described participants with type 2 diabetes. 4 studies described adult participants.

2 supporting studies do not have a displayable topic-matched quantitative effect.

Evidence uses heterogeneous comparison contexts: active_comparator, placebo, unknown_unresolved.

2 of 4 studies with duration data have follow-up of 12 weeks or less.

Structured population data were available for 4 of 4 supporting studies. Diabetes type was heterogeneous: 2 studies with type 2 diabetes, 1 studies with type 1 diabetes. 3 studies described adult participants.

4 of 4 studies with duration data have follow-up of 12 weeks or less.

Structured population data were available for 7 of 7 supporting studies. Diabetes type was heterogeneous: 4 studies with type 2 diabetes, 1 studies with type 1 diabetes. 5 studies described adult participants.

Evidence uses heterogeneous comparison contexts: active_comparator, baseline_within_group, placebo, unknown_unresolved, usual_care.

2 studies contain conflicting p-value and significance fields; those significance claims are suppressed.

Structured population data were available for 9 of 9 supporting studies. Diabetes type was heterogeneous: 4 studies with type 1 diabetes, 2 studies with type 2 diabetes. 7 studies described adult participants.

Vitamin D supplementation × Fasting Plasma Glucose (FPG)

Available supporting studies

High-dose vitamin D3 does not improve insulin resistance in type 2 diabetes

Vitamin D supplementation reduces neonatal birth weight in gestational diabetes

Vitamin D3 may improve periodontal health in diabetes