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the claim

Vitamin D supplementation lowers blood glucose levels.

the verdict
CONTESTED PARTIAL
Recorded sources
4 sources for · 1 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that vitamin D supplementation lowers blood glucose levels?

Partly. Evidence is mixed and only partial: a meta-analysis in type 2 diabetes reports modest, diminishing effects of vitamin D on glycemic markers, a small trial in obese women found lower fasting glucose, and a cross-sectional study links low vitamin D to diabetes, while another review reports no significant HbA1c improvement in type 2 diabetes. No item establishes that vitamin D supplementation lowers blood glucose generally.

Verdict: CONTESTED PARTIAL · 4 sources for, 1 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 4
The Relationship between Vitamin D Levels and Blood Glucose and Cholesterol Levels
2024
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Elsheikh, E., Alabdullah, A., Alharbi, S. S., Alagha, A., AlAhmed, D. H., & Alalmaee, M. M. A. (2024). The Relationship between Vitamin D Levels and Blood Glucose and Cholesterol Levels. doi.org. https://doi.org/10.3390/clinpract14020032

Evidence against · 1
Does Vitamin D Have a Role in Diabetes? -
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Does Vitamin D Have a Role in Diabetes? - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.7759/cureus.30432

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More for · 3
Glutathione Stimulates Vitamin D Regulatory and Glucose-Metabolism Genes, Lowers Oxidative Stress and Inflammation, and Increases 25-Hydroxy-Vitamin D Levels in Blood: A Novel Approach to Treat 25-Hydroxyvitamin D Deficiency
2018
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Glutathione Stimulates Vitamin D Regulatory and Glucose-Metabolism Genes, Lowers Oxidative Stress and Inflammation, and Increases 25-Hydroxy-Vitamin D Levels in Blood: A Novel Approach to Treat 25-Hydroxyvitamin D Deficiency. (2018). doi.org. https://doi.org/10.1089/ars.2017.7462

Effect of Vitamin D Supplementation According to Daily Dietary Levels on Biochemical Parameters in 25-Hydroxyvitamin D Deficiency of Women with Obesity
2024
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Cesur, F. & Genç, Z. N. (2024). Effect of Vitamin D Supplementation According to Daily Dietary Levels on Biochemical Parameters in 25-Hydroxyvitamin D Deficiency of Women with Obesity. doi.org. https://doi.org/10.4274/tjps.galenos.2024.37632

The Impact of Vitamin D Supplementation on Fasting Plasma Glucose, Insulin Sensitivity, and Inflammation in Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis
2025
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Probosari, E., Subagio, H., Heri-Nugroho, Rachmawati, B., Muis, S. F., Tjandra, K., Adiningsih, D., & Winarni, T. (2025). The Impact of Vitamin D Supplementation on Fasting Plasma Glucose, Insulin Sensitivity, and Inflammation in Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis. doi.org. https://doi.org/10.3390/nu17152489

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