The action of the ginger compounds was immune-modulatory, anti-tumorigenic, anti-inflammatory, anti-apoptotic, anti-hyperglycemic, anti-lipidemic, and anti-emetic. Anti-diabetic and blood sugar reduction properties have been validated in experiments on rats. (Al-Amin et.al.,2006)
Oral powder of ginger has been found to reduce blood sugar in experiments on type 2 diabetic patients. (N.Khandouzi et al., 2015). However, there are no clinical trials conducted so far that will validate this property of ginger.
In the course of my research on natural solutions for diabetes, I did not come across validated support of the use of ginger as an antidiabetic herb in either Ayurveda or TCM literature. Herbal formulations of today for diabetes healing may however contain ginger as one of its ingredients. The world of plants is vast and we are still learning about their medicinal properties.
To read more on natural solutions for diabetes, you can look here.