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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Myth-buster

Vitamin D supplementation was linked to a 50-point drop in a measure of beta-cell function in type 2 diabetes — but the same meta-analysis found it improved insulin, HbA1c, and inflammation.

This is one of the first meta-analyses to report a harmful effect on HOMA-B alongside clear benefits on other markers, so the picture is now genuinely contested — not settled.

HOMA-B reflects how well the pancreas's beta cells produce insulin in response to blood sugar. A drop of 50 points suggests worse beta-cell function, yet the same analysis found vitamin D lowered blood sugar, insulin resistance, and inflammation. Because the study didn't specify the dose or duration, and the HOMA-B result contradicts the overall pattern, this finding raises more questions than it answers.

Where this fits in the evidence

This is among the first studies we've indexed on Vitamin D for Reduced HOMA-B — treat it as an early signal until more research accumulates.

The study

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.

  • Meta-Analysis
  • 2025-07-30
  • Nutrients
More on Vitamin DMore on Reduced HOMA-B

This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.

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