Have any supplements been studied for type 1 diabetes?

Supplements have not been studied for treating T1D, specifically, but for improving glycemic control or helping to maintain healthy blood glucose levels in general. A variety of micronutrients have been examined, most notably zinc, selenium, chromium, vitamin D, vitamin B3, and vitamin C.^[1] Other common supplements marketed to improve glycemic control include dietary fiber, probiotics, cinnamon, aloe vera, and panax ginseng.