Cinnamon bark has been shown in a number of animal studies to improve blood sugar levels, though its effect in humans is not too
clear. Hence, the review authors set out to determine the effect of oral cinnamon extract on blood sugar and other outcomes. The
authors identified 10 randomised controlled trials, which involved 577 participants with diabetes mellitus. Cinnamon was administered
in tablet or capsule form, at a mean dose of 2 g daily, for four to 16 weeks. Generally, studies were not well conducted and lacked in
quality.