Hormonal

Vitamin D supplementation does not significantly improve glycaemic control (HbA1c) or insulin resistance in patients with normal fasting glucose, and provides only a small, likely clinically insignificant reduction in fasting glucose for those with diabetes or impaired glucose tolerance.

If you have diabetes or pre-diabetes, taking Vitamin D supplements is unlikely to significantly lower your blood sugar or HbA1c levels. While there might be a tiny reduction in fasting glucose for some, it is not clinically significant enough to rely on as a treatment. Focus on proven methods like diet, exercise, and prescribed medication instead.