“Helps promote sugar metabolism,” says Trunature Advanced Strength CinSulin, a water extract of cinnamon. “Supports healthy blood glucose levels (within the normal range).” CinSulin? Surely Trunature didn’t mean to imply that its supplement is as effective as insulin? Nah. “Water extract of cinnamon has been studied in six human clinical trials and a meta-analysis to prove its effectiveness and safety,” says CinSulin’s website. Sounds impressive. Yet in 2012, a rigorous Cochrane Collaboration meta-analysis of randomized trials found that cinnamon had no clear effect on blood sugar.