The average hemoglobin A1C level was higher (meaning less than optimal control) in patients with the most severe vitamin D deficiencies.

CNN: Do vitamins help against type 2 diabetes?

At the end of one year, 42 patients on LAF237 plus metformin--a commonly prescribed drug--maintained an A1C level that was on average 1.1% lower than the 29 patients taking metformin and a placebo.

FORBES: Novartis Results Heat Up Diabetes Drug Race