Vitamin C
Supplementation may be beneficial in decreasing blood glucose
and lipids in patients with type 2 diabetes and thus reducing the
risk of complications1
# From 2 servings; * RDA - Recommended Dietary Allowance; TM: Trademark under license from Signutra Inc., USA

References:
1.Afkhami-Ardekani M, Shojaoddiny-Ardekani A. Effect of vitamin C on blood glucose, serum lipids & serum insulin in type 2 diabetes patients. Indian J Med Res. 2007 Nov;126(5):471-74.