Lee Y.-M., Wolf P., Hauner H., and Skurk T. “Effect of a Fermented Dietary Supplement Containing Chromium and Zinc on Metabolic Control in Patients With Type 2 Diabetes: A Randomized, Placebo-Controlled, Double-Blind Cross-over Study”. Food & Nutrition Research, vol. 60, June 2016, doi:10.3402/fnr.v60.30298.