High-dose vitamin D3 does not improve insulin resistance in type 2 diabetes
Highly relevant
Interventions:
Strength:
Supplements for Diabetes: Evidence for Vitamins, Probiotics, Botanicals, and Nutraceuticals
Evidence related to supplements and nutraceuticals
Evidence related to vitamins, minerals, probiotics, synbiotics, botanicals, and nutraceutical supplements studied in diabetes.
11
Studies
18
Evidence Pairs
Moderate Research Support
Relationship Confidence: 62/100
Supporting Studies
11
Research documents analyzed
Evidence Pairs
18
Intervention-outcome relationships
Latest Publication
May 2026
Avg. Evidence: 43/100
Evidence Snapshot
Qualitative overview of the evidence landscape
Moderate Confidence
Practical Questions
Does Vitamin D supplementation improve serum 25-hydroxyvitamin d?
intervention effectivenessEmerging Evidence
Vitamin D supplementation appears to improve Serum 25-hydroxyvitamin D.
Consistency: Results are consistent across studies.
Ranked evidence signals
- 1
Vitamin D supplementation
Emerging | score 58.6 | strong positive | Consistent | 2 studies
Why this answer: This answer is based on a small number of supporting studies and should be interpreted cautiously.
Limitations
- Only a small number of supporting studies are available.
- Population details are unavailable.
Does Multi-species synbiotic (12 probiotic strains + FOS prebiotic) improve hba1c?
intervention effectivenessEmerging Evidence
Multi-species synbiotic (12 probiotic strains + FOS prebiotic) appears to improve HbA1c.
Consistency: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
- 1
Multi-species synbiotic (12 probiotic strains + FOS prebiotic)
Emerging | score 55.0 | strong positive | Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
- Consistency cannot yet be determined.
- Population details are unavailable.
Does Multi-species synbiotic (12 probiotic strains + FOS prebiotic) improve fasting plasma glucose (fpg)?
intervention effectivenessEmerging Evidence
Multi-species synbiotic (12 probiotic strains + FOS prebiotic) may improve Fasting Plasma Glucose (FPG).
Consistency: Results are mixed and should be interpreted cautiously.
Evidence caveat: The available evidence reports mixed findings.
Ranked evidence signals
- 1
Multi-species synbiotic (12 probiotic strains + FOS prebiotic)
Emerging | score 50.5 | moderate positive | Mixed | 2 studies
Why this answer: This answer is cautious because the available studies report mixed findings.
Limitations
- Only a small number of supporting studies are available.
- Population details are unavailable.
Does Bifidobacterium longum subsp. longum BL21 improve hba1c?
intervention effectivenessEmerging Evidence
Bifidobacterium longum subsp. longum BL21 appears to improve HbA1c.
Consistency: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
- 1
Bifidobacterium longum subsp. longum BL21
Emerging | score 55.0 | strong positive | Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
- Consistency cannot yet be determined.
- Population details are unavailable.
Does Magnesium citrate improve 24-h urine magnesium excretion?
intervention effectivenessEmerging Evidence
Magnesium citrate appears to improve 24-h urine magnesium excretion.
Consistency: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
- 1
Magnesium citrate
Emerging | score 55.0 | strong positive | Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
- Consistency cannot yet be determined.
- Population details are unavailable.
Does Vitamin D supplementation improve fasting plasma glucose (fpg)?
intervention effectivenessEmerging Evidence
Current evidence does not show a clear benefit of Vitamin D supplementation for Fasting Plasma Glucose (FPG).
Consistency: Results are consistent across studies.
Ranked evidence signals
- 1
Vitamin D supplementation
Emerging | score 41.1 | neutral | Consistent | 2 studies
Why this answer: This answer is based on a small number of supporting studies and should be interpreted cautiously.
Limitations
- Only a small number of supporting studies are available.
- Population details are unavailable.
Does Bifidobacterium longum subsp. longum BL21 improve gut microbiota composition?
intervention effectivenessEmerging Evidence
Bifidobacterium longum subsp. longum BL21 appears to improve gut microbiota composition.
Consistency: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
- 1
Bifidobacterium longum subsp. longum BL21
Emerging | score 55.0 | strong positive | Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
- Consistency cannot yet be determined.
- Population details are unavailable.
Does Probiotics improve hba1c?
intervention effectivenessLimited Evidence
Current evidence does not show a clear benefit of Probiotics for HbA1c.
Consistency: Results are consistent across studies.
Ranked evidence signals
- 1
Probiotics
Limited | score 36.6 | neutral | Consistent | 2 studies
Why this answer: This answer is based on a small number of supporting studies and should be interpreted cautiously.
Limitations
- Only a small number of supporting studies are available.
- Population details are unavailable.
Studied interventions
Interventions studied in relation to this topic
Bifidobacterium longum subsp. longum BL21
1 study
View evidence
Multi-species synbiotic (12 probiotic strains + FOS prebiotic)
2 studies
View evidence
Magnesium citrate
1 study
View evidence
Vitamin D supplementation
2 studies
View evidence
Probiotics
2 studies
View evidence
Oxygen-enriched water
1 study
View evidence
Carob liquid concentrate
1 study
View evidence
Allium hookeri extract
1 study
View evidence
Note: Scores are provided by the evidence graph and may reflect evidence strength, evidence base, or relationship confidence depending on context. Click any option to explore the supporting research in our archive.
Strongest evidence signals
Key patterns and insights identified across the research landscape
Strong positive signal
Vitamin D supplementation shows strong evidence for improving Serum 25-hydroxyvitamin D
Vitamin D supplementation → Serum 25-hydroxyvitamin D
Across 2 studies, Vitamin D supplementation shows a consistent strong positive signal for Serum 25-hydroxyvitamin D.
2 studies
Strong positive signal
Magnesium citrate shows strong evidence for improving 24-h urine magnesium excretion
Magnesium citrate → 24-h urine magnesium excretion
Across 1 study, Magnesium citrate shows a strong positive signal for 24-h urine magnesium excretion.
1 studies
Strong positive signal
Bifidobacterium longum subsp. longum BL21 shows strong evidence for improving gut microbiota composition
Bifidobacterium longum subsp. longum BL21 → gut microbiota composition
Across 1 study, Bifidobacterium longum subsp. longum BL21 shows a strong positive signal for gut microbiota composition.
1 studies
Strong positive signal
Bifidobacterium longum subsp. longum BL21 shows strong evidence for improving HbA1c
Bifidobacterium longum subsp. longum BL21 → HbA1c
Across 1 study, Bifidobacterium longum subsp. longum BL21 shows a strong positive signal for HbA1c.
1 studies
Strong positive signal
Multi-species synbiotic (12 probiotic strains + FOS prebiotic) shows strong evidence for improving HbA1c
Multi-species synbiotic (12 probiotic strains + FOS prebiotic) → HbA1c
Across 1 study, Multi-species synbiotic (12 probiotic strains + FOS prebiotic) shows a strong positive signal for HbA1c.
1 studies
Supporting Research
Selected studies that best represent the evidence behind this topic.
View research summary→
Semaglutide with Insulin Improves Diabetes Control and Kidney Health
High quality
Interventions:
Strength:
BL21 probiotic improves glycemic control in type 2 diabetes patients
High quality
Interventions:
Strength:
Magnesium supplementation shows little effect on arterial stiffness in T2DM.
High quality
Interventions:
Strength:
Newer diabetes drugs show stronger weight and blood sugar benefits in prediabetes
May 16, 2026
High quality
Interventions:
Outcomes:
Strength:
Vitamin D supplementation reduces neonatal birth weight in gestational diabetes
High quality
Interventions:
Strength:
Click any study to view the full research summary, or click interventions and outcomes to filter the archive.
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